PRACTICAL RENOVATION PLANNING GUIDE
How to Compare Renovation Quotes.
Compare the written scope, supply responsibilities, allowances, VAT, exclusions, programme and payment stages behind each total—not only the headline price.
General planning guidance. A project-specific quotation must reflect the actual property, agreed work and information available.
Quotation comparison
Same briefCompare like for like.
- Written construction scope Check
- Materials and product supply Check
- Fixed items and allowances Check
- VAT and complete payable amount Check
- Exclusions and client responsibilities Check
Clarify differences in scope and specification before deciding which quotation represents the project you intend to complete.
Illustrative comparison framework
Give each contractor the same rooms, proposed alterations, specification and available project information.
Review VAT, client-supplied products, separate fees and genuine exclusions alongside the construction total.
Understand how additional work, upgraded products and unresolved conditions would be described, priced and agreed.
START WITH THE SCOPE
Similar totals can describe very different renovations.
A quotation is useful only when you can understand what work, products, responsibilities and assumptions sit behind the final amount.
One contractor may include preparation, waste removal and complete finishing while another expects those items to be supplied, arranged or priced separately. The totals are not directly comparable until those differences are clear.
CONSTRUCTION SCOPE
What work is actually included?
Compare the rooms, demolition, preparation, installation, building services, making good and final finishes described in writing. A broad phrase such as “complete renovation” does not define every task.
SUPPLY RESPONSIBILITY
Who supplies materials and products?
Establish whether the contractor or homeowner supplies kitchens, bathroom fittings, flooring, appliances, lighting and other selected products. Installation-only and supply-and-installation quotations cannot be compared as though they cover the same project.
ASSUMPTIONS
Which figures are fixed and which remain open?
Identify fixed work, product allowances, provisional items and matters requiring further investigation. An unresolved allowance should explain what information is needed before its final value can be established.
COMPLETION STANDARD
What condition will the property be left in?
Confirm the agreed making good, decoration, testing, waste removal, cleaning, snagging and handover arrangements. A quotation may stop at installation while another includes the surrounding work needed to produce the finished room.
A lower total may represent better value, but it may also omit work, products or responsibilities included elsewhere. First bring the quotations onto the same scope and specification; then compare their price, programme and commercial terms.
BEFORE REQUESTING QUOTATIONS
Give every contractor the same project information.
Quotations are easier to compare when they respond to one consistent written brief. If different contractors receive different room lists, product choices or drawings, the totals will naturally describe different work.
The brief does not need to answer every technical question before the property is assessed. It should distinguish what has been decided, what remains flexible and which matters still require investigation.
If the layout, room list or specification changes during the quotation stage, send the same revision to each contractor before comparing the updated totals.
Consistent project brief
Comparison basis-
01
Property and rooms
Provide the London postcode, property type, approximate size, occupancy arrangements and a clear list of the rooms or areas included in the proposed renovation.
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02
Proposed alterations
Describe retained layouts, room changes, structural openings, extensions, service alterations and any work requiring drawings, calculations, consents or specialist information.
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03
Products and finish
Identify selected kitchens, bathroom fittings, flooring, appliances, doors, lighting and finishes—or provide a consistent allowance where the final product has not been selected.
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04
Available project information
Share the same photographs, measurements, plans, surveys, structural information, approval documents and known access restrictions with every contractor invited to quote.
Keep one current version. Date the brief and supporting drawings so each quotation can identify the information on which it was prepared.
READ BEYOND THE TOTAL
What should a renovation quotation identify?
A useful quotation should provide enough written information to show what has been priced, what remains unresolved and what the homeowner must arrange or supply.
The format may differ between contractors. What matters is whether the important scope, specification and commercial assumptions can be understood before work begins.
Defined scope of work
The property areas, rooms, removal work, preparation, alterations, installations and finishing included within the quotation.
Materials and products
Construction materials, selected products and fittings included, together with items supplied directly by the homeowner or another appointed supplier.
Allowances and assumptions
Amounts based on selections not yet finalised, conditions not yet visible or information still required before the affected work can be confirmed.
VAT and payment basis
Whether VAT is included or excluded, the complete amount currently payable and what each proposed payment stage relates to within the project.
Programme and access
Important timing assumptions, working arrangements, site access, occupation, storage, deliveries and dependencies affecting the proposed construction programme.
Exclusions and boundaries
Work, professional services, statutory charges, selected products and surrounding repairs that are not covered by the stated construction total.
THE PRACTICAL TEST
Can you explain what remains outside the quotation?
Ask what you would still need to pay for, supply, decide or arrange before the quotation represents the intended finished renovation.
An exclusion is not automatically a problem. The problem is an important responsibility or cost that remains unclear when you make the comparison.
UNDERSTAND THE CERTAINTY
Separate confirmed prices from allowances and unresolved work.
A quotation can contain a mixture of defined work, estimated allowances and items that cannot yet be finalised. Those categories should not be treated as though they offer the same level of certainty.
Terminology and quotation formats vary. Ask what each figure means, which assumptions support it and what could cause the eventual amount to change.
DEFINED WORK
Clearly described and priced.
The task, quantity, specification or installation responsibility is sufficiently defined for the quotation to state what has been included on the available information.
- Is the room, task or measured quantity identified?
- Are the material and product responsibilities clear?
- Is the preparation and finished condition described?
OPEN ALLOWANCE
Dependent on a later decision or finding.
The final product, quantity, condition or technical requirement has not yet been established. The quotation should identify the basis of the allowance and what will resolve it.
- What assumption has been used for the current amount?
- What information, selection or investigation is outstanding?
- How will any difference be explained and agreed?
Work based on an identified scope, quantity, location and available specification.
A stated amount for an item not yet selected, such as flooring, sanitaryware or a kitchen component.
Work dependent on investigation, opening up, professional information or a condition that cannot yet be confirmed.
A cost, product, service or surrounding task clearly stated as outside the contractor’s current quotation.
When comparing quotations, record each allowance separately and use the same reasonable basis across every contractor. A quotation with a lower allowance may produce a lower headline total without offering a less expensive price for the eventual selected product or completed work.
WHO SUPPLIES WHAT?
Separate labour, construction materials and selected products.
Two quotations may describe the same room while assigning very different supply, ordering and installation responsibilities.
Confirm who provides each category before comparing totals. Products purchased directly by the homeowner still belong in the complete project budget even when they do not appear in the contractor’s quotation.
LABOUR
Construction and installation work.
The contractor’s agreed work to prepare, construct, install, connect, finish and complete the areas identified within the quotation.
- Rooms, tasks and trades included
- Preparation and making-good standard
- Testing, finishing and handover scope
MATERIALS
Supplies needed to carry out the work.
Construction and installation materials such as plasterboard, plaster, timber, pipework, cables, fixings, adhesives and other supplies required for the stated work.
- Materials included within each task
- Specialist materials priced separately
- Delivery, handling and waste arrangements
PRODUCTS
Items selected for the finished property.
Kitchens, appliances, sanitaryware, tiles, flooring, doors, lighting, ironmongery and other visible products selected for installation.
- Named products or stated allowances
- Contractor-supplied or client-supplied
- Compatibility, delivery and installation needs
CLIENT-SUPPLIED PRODUCTS
The purchase price is only one part of the responsibility.
Where you supply products directly, clarify who checks dimensions, quantities, compatibility, lead times, delivery condition and storage. Establish what happens if an item is delayed, damaged, incomplete or unsuitable for the intended installation.
Confirm whether fitting, connections, trims, accessories, preparation and surrounding making good are included. A product supplied by the homeowner does not automatically mean every connected installation task is covered by the labour quotation.
COMPLETE PAYABLE AMOUNT
Compare VAT treatment and costs outside the building quotation.
A lower pre-VAT figure should not be compared directly with a quotation showing the complete amount including VAT. Establish the stated VAT treatment and calculate the amount payable on the same basis.
Your complete project budget may also include products purchased directly, professional services, application charges, accommodation, storage and other costs that sit outside the contractor’s construction quotation.
Check whether a product, fee or service is already included before adding it separately to the project budget. Different suppliers and fees may also have different VAT treatment.
Budget reconciliation
Check separatelyWhat sits behind the final amount?
- Construction quotation Confirm scope
- VAT treatment Confirm total
- Client-supplied products Add if separate
- Professional and approval costs Check responsibility
- Accommodation, storage and moving Allow if needed
Record included work, VAT, genuine exclusions and separate client costs in one comparison before deciding which quotation represents the complete project more accurately.
Drawings, surveys, structural design or other specialist information required for the proposed work.
Applicable planning, Building Control, freeholder, managing-agent or other project-specific charges.
Kitchens, bathroom products, flooring, appliances, lighting and finishes purchased outside the construction quotation.
Temporary accommodation, furniture storage, moving and other household costs connected with the renovation programme.
TIMING AND PAYMENT STRUCTURE
Compare how the work and payments are expected to progress.
A proposed programme should reflect the property, agreed scope, approvals, product availability, access and the sequence required to complete the work properly.
Payment stages should also be understandable. Compare what each payment relates to, when it is expected and how progress or changes will be recorded.
Information ready
Required plans, structural details, approvals and product decisions are available for the affected work.
Site preparation
Access, protection, strip-out, waste arrangements and necessary enabling work are coordinated.
Construction sequence
Structural work, building services, preparation and installations progress in the required order.
Finishes and fittings
Selected products, final surfaces, decorations and fittings are completed after the necessary preceding work.
Completion and handover
Agreed snagging, final checks, cleaning and completion information are addressed before handover.
COMPARE THE PROGRAMME
What assumptions support the proposed duration?
- Does the period include preparation, drying and final finishing?
- Are design, approvals and product lead times included or separate?
- Is the property vacant, occupied or being renovated in phases?
- Which decisions or deliveries could affect the sequence?
COMPARE THE PAYMENTS
What does each proposed payment represent?
- Is the payment linked to an identified stage, order or activity?
- Are separately ordered products or materials clearly identified?
- How will completed progress and outstanding work be recorded?
- How are approved changes reflected in later payment amounts?
Check whether every quotation covers the same preparation, scope and completion standard. A shorter period may reflect a different working method, more resources or simply fewer included tasks. Ask each contractor to explain the principal assumptions behind the proposed duration.
CHANGES AND ADDITIONAL WORK
Understand how changes will be explained, priced and agreed.
Renovation work can change because the homeowner revises the brief, a selected product changes or previously concealed conditions become visible.
Before choosing between quotations, establish the intended process for recording the reason, scope, price and programme effect of additional work.
Identify the reason
Record whether the proposed change results from a client request, product decision, updated design information or a condition revealed during the work.
Define the revised scope
Describe what additional, omitted or altered work is proposed, including any connected preparation, materials, services and making good.
Confirm cost and timing
Explain the price difference, VAT treatment and any effect on product orders, access, dependencies or the agreed construction programme.
Record the decision
Keep the agreed instruction with the current scope and budget so the quotation, changes and completion responsibilities remain aligned.
COMMON SOURCES OF CHANGE
Not every additional cost has the same cause.
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01
Homeowner-requested changes
Revised layouts, added work, upgraded products or a different finishing standard requested after the original scope was priced.
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02
Information received later
Updated drawings, structural details, approval requirements or supplier information that changes the affected work.
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03
Conditions revealed during work
Concealed construction, damaged substrates or services that could not be fully established before access or strip-out.
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04
Product substitutions or delays
Selected products becoming unavailable, arriving incomplete or requiring different preparation, accessories or installation.
A reserve for unresolved property conditions is not the same as a decision to add work or choose a more expensive product. Recording the reason for each change makes the developing project budget easier to understand.
LOOK BEYOND THE TOTAL
The quotation is only one part of choosing a contractor.
A quotation may appear detailed and competitively priced, but the proposed contractor must also be suitable for the scale, complexity and practical conditions of the renovation.
Review the company, relevant project evidence, communication and delivery assumptions alongside the written price. The aim is to understand who will carry out the agreed work and how the project is expected to be managed.
IDENTITY
Confirm the business you are appointing.
Check the trading or company details shown on the quotation, the contact information provided and who will be responsible for the proposed work.
RELEVANCE
Look for experience relevant to the scope.
A complete renovation, structural alteration and individual-room installation involve different coordination, sequencing and technical requirements.
EVIDENCE
Review genuine completed projects.
Look for property-specific examples showing work relevant to your proposed project rather than relying only on generic images or broad service descriptions.
INSURANCE
Ask for current, relevant information.
Request evidence of the insurance arrangements relevant to the proposed contractor and project rather than relying on an unsupported statement within marketing material.
COMMUNICATION
Notice how questions are handled.
Clear explanations of assumptions, exclusions and outstanding information provide a better basis for discussion than pressure to accept an unclear total.
DELIVERY
Clarify who coordinates the project.
Understand the principal contact, site supervision, relevant specialist trades, product responsibilities and how project decisions will be recorded.
A BALANCED DECISION
Price, scope and delivery need to make sense together.
The highest quotation is not automatically the most complete, and the lowest is not automatically unsuitable. Compare the same project information, then review the written scope, specification, commercial terms and relevant evidence behind each proposal.
Ask for unclear differences to be explained before deciding. A professional comparison should reduce assumptions rather than replace them with conclusions based only on price.
BEFORE YOU DECIDE
Pause and clarify important gaps or inconsistencies.
A missing detail does not automatically make a quotation unsuitable. It means the affected responsibility, assumption or cost should be explained before you rely on the total.
Ask questions in writing and keep the answers with the current quotation. This creates a clearer comparison and reduces the risk of making a decision based on different interpretations of the work.
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01
Broad descriptions without room-level detail
Phrases such as “complete renovation” or “all finishing” may conceal different interpretations. Ask which rooms, surfaces, installations and completion tasks are included.
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02
VAT treatment is not stated
Confirm whether figures include or exclude VAT and establish the complete amount currently payable before comparing the quotation with another total.
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03
Products are described only as “standard”
Ask for named products, a specification or a stated allowance. General quality labels do not establish the product, quantity, supply responsibility or installation requirement.
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04
Important exclusions are not addressed
Clarify professional input, approval charges, client-supplied products, waste, protection, making good, decoration, cleaning and other connected work relevant to the project.
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05
The programme has no stated assumptions
Ask whether design, approvals, procurement, drying, occupied working, phased access and final finishing sit inside or outside the proposed construction period.
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06
Changes would be handled only verbally
Establish how additional work, upgraded products and revised instructions would be described, priced, approved and added to the developing project record.
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07
Pressure to decide before questions are answered
Allow yourself time to understand material differences between quotations. A decision should follow clarification of the project scope rather than depend only on urgency or headline price.
Clear questions help both homeowner and contractor confirm the intended project. If the scope changes during clarification, ask for the quotation or supporting schedule to be updated before making the final comparison.
FINAL COMPARISON CHECKLIST
Ten checks before choosing between renovation quotes.
Review each quotation against the same brief and record where further explanation is needed. The aim is not to make every proposal look identical—it is to understand the material differences.
Keep the current quotation, supporting schedules, product information and written clarifications together so the final decision reflects the complete proposal.
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01
Same project brief
Each contractor received the same rooms, drawings, proposed alterations and finish requirements.
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02
Written scope
Removal, preparation, construction, installation and finishing work are described clearly enough to compare.
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03
Supply responsibilities
Labour, construction materials, selected products and client-supplied items are identified separately.
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04
Product specification
Named products or consistent allowances are used instead of relying only on broad descriptions such as “standard”.
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05
Allowances explained
Items dependent on later selections, investigation or technical information state their current basis.
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06
VAT and total payable
The VAT treatment is stated and every quotation is compared using the same complete payable basis.
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07
Exclusions reviewed
Professional services, applications, products, waste, making good and other relevant boundaries are addressed.
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08
Programme assumptions
Access, occupation, approvals, procurement, drying and finishing assumptions behind the proposed duration are understood.
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09
Payments understood
Each proposed payment can be related to an identified project stage, activity, order or agreed responsibility.
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10
Change process recorded
The method for describing, pricing, approving and recording additional work or revised selections is clear.
ONE FINAL QUESTION
Ask what remains outside the quotation.
What would I still need to pay for, supply, decide or arrange before this quotation represents the finished renovation I am expecting?
This checklist supports project planning and quotation comparison. It does not certify a contractor, determine contractual suitability or replace project-specific professional or legal advice where required.
CONNECT PLANNING WITH DELIVERY
Explore the service that matches your renovation.
This guide helps you compare quotations, but the required scope still depends on the property and type of work you are planning.
Use the relevant Growchance service page to understand the delivery route, connected trades and project information that may be needed before a property-specific quotation can be prepared.
WHOLE PROPERTY
Full Home Renovation
Coordinate multiple rooms, building services, finishes and agreed structural work within one connected renovation scope.
FLATS & APARTMENTS
Flat Renovation
Plan around access, shared buildings, building management, lease conditions, neighbours and connected internal work.
DETAILED ROOM
Kitchen Renovation
Bring cabinetry, worktops, appliances, services, preparation, installation and finishing into one defined kitchen scope.
WET ROOM WORK
Bathroom Renovation
Define sanitaryware, plumbing, electrical work, preparation, waterproofing, tiling, installation and final finishing.
ADDITIONAL SPACE
House Extensions
Connect design information, approvals, structural work, building services, construction and the interface with the existing home.
STRUCTURAL WORK
Structural Alterations
Define the proposed change, required professional information, temporary support, construction, approvals and making good.
PREPARE BEFORE ENQUIRING
Build a clearer brief, budget and project route.
FREQUENTLY ASKED QUESTIONS
Comparing renovation quotations.
Practical answers about scope, VAT, product allowances, site information and the differences that should be clarified before appointing a contractor.
Discuss Your Project01 How do I compare renovation quotes fairly?
Give each contractor the same project brief, plans, room list and product information. Then compare the written construction scope, supply responsibilities, allowances, VAT, exclusions, programme and payment stages.
Ask for material differences to be explained before comparing the final totals.
02 Should I automatically choose the cheapest quotation?
No quotation should be selected from price alone. A lower total may represent good value, but it may also reflect fewer included tasks, lower product allowances or responsibilities placed outside the quotation.
First establish whether the quotations describe the same work and specification. Then compare price alongside delivery assumptions and relevant project evidence.
03 Do all contractors need to use the same quotation format?
No. Formats and terminology vary. The important point is whether each proposal provides enough written information to understand the scope, supply responsibilities, assumptions, exclusions, programme and amount payable.
You can create your own comparison schedule and transfer the relevant information from each quotation onto the same headings.
04 How do I compare one price including VAT with another excluding VAT?
Ask each contractor to state the VAT treatment and complete amount currently payable. Compare all construction quotations on the same VAT basis rather than placing a pre-VAT figure beside an VAT-inclusive total.
Check third-party fees and separate suppliers individually because their VAT treatment may differ.
05 What is a product allowance in a renovation quotation?
A product allowance is a stated amount used where the final item has not yet been selected. It may apply to flooring, sanitaryware, kitchen components, tiles or other products.
Confirm what quantity and product category the allowance assumes, whether delivery and installation are included, and how any difference will be calculated after selection.
06 Can I receive a final renovation quote from photographs alone?
Photographs, plans and a clear brief can support an initial discussion, but they may not establish measurements, access, concealed construction, service condition or preparation needs.
A reliable final quotation requires sufficient project information. A site visit, investigation or relevant professional details may be needed, with any remaining assumptions recorded clearly.
07 What happens if the renovation scope changes after work begins?
The reason and revised work should be identified, together with the price, VAT and programme effect. Keep the agreed instruction with the current scope and budget.
Separate homeowner-requested upgrades from conditions revealed during work so the developing project cost remains understandable.
08 Will Growchance independently review another contractor’s quotation?
This guide helps homeowners understand common comparison points, but Growchance does not certify or provide an independent validation of another contractor’s quotation.
Where a proposed London renovation is suitable for Growchance, we can review the property and available project information before preparing our own scope and quotation for the work we may deliver.
DISCUSS YOUR RENOVATION
Tell us about your property and proposed work.
If you want Growchance to consider delivering your London renovation, share the property details, intended scope and information currently available. We will review the enquiry and contact you to discuss project suitability and whether a site visit is the appropriate next step.
London postcode, property type, approximate size and whether it is currently occupied.
Rooms involved, intended alterations, required installations and the finish you want to achieve.
Mention any photographs, measurements, plans, drawings, surveys, approvals or product selections available for review.
Tell us whether you are defining the brief, preparing approvals, comparing project options or ready to discuss construction.
Submitting an enquiry does not create a contract, validate another contractor’s quotation or guarantee availability. Project suitability, scope, programme and pricing are confirmed separately.