Build your bathroom estimate
Bathroom Renovation Cost Calculator London
Describe your bathroom project to BuildBot and receive a personalised preliminary estimate based on the work you actually want completed.
No account required and no obligation. Results are preliminary estimates for planning and budgeting purposes, not fixed quotations.
Start with your own words rather than construction terminology.
The conversation adapts to the bathroom work you select.
Review the initial scope, assumptions and estimated project cost.
Bathroom estimator
Tell BuildBot What You Want to Change
You do not need to know construction terminology. Describe the work in your own words, and BuildBot will ask the questions relevant to your particular bathroom project.
Example starting points What can I enter?
Tell BuildBot whether you need a complete renovation or one particular bathroom job.
The questions change according to the work selected, existing conditions and information already supplied.
Receive a preliminary scope, assumptions and estimated project cost based on your answers.
Flexible project scope
One Bathroom. From a Small Job to a Complete Renovation.
BuildBot can help prepare an initial estimate for a coordinated bathroom renovation or for individual work involving one or several bathroom elements.
Complete Bathroom Renovation
Build a preliminary scope across the connected stages required to remove, prepare, install and finish an entire bathroom.
- Existing bathroom strip-out
- Protection and waste removal
- Wall and floor preparation
- Plumbing and drainage work
- Electrical work and ventilation
- Waterproofing and tiling
- Sanitaryware and furniture installation
- Decoration, sealing and final finishing
Bath and Shower Work
Describe a bath, shower or conversion project without estimating an unnecessary whole-room renovation.
- Bath replacement
- Bath relocation
- Bath-to-shower conversion
- Shower mixer replacement
- Shower screen replacement
- Shower tray and enclosure work
Toilet, Basin and Furniture
Estimate individual sanitaryware or bathroom-furniture changes and the normal associated installation work.
- Toilet replacement
- Basin replacement
- Vanity-unit replacement
- Taps and basin mixer
- Bathroom furniture
- Normal connections and sealing
Bathroom Walls and Floors
Define the required surface area and selected finish before BuildBot considers preparation, materials and installation.
- Wall-tile removal
- Wall tiling
- Floor-tile removal
- Floor tiling
- Waterproof wall panels
- Bathroom painting
Electrical and Finishing Work
Add relevant bathroom services and finishing items to a larger project or describe them as individual requested work.
- Extractor-fan replacement
- Bathroom lighting
- Heated towel rail
- Bathroom mirror
- Accessories and fittings
- Final sealing and finishing
BuildBot can also guide you through individual bathroom jobs and combinations of work, using questions relevant to the scope you describe.
Where the cost depends on concealed pipework, drainage, electrical conditions, damaged backgrounds or another condition that cannot be confirmed online, the estimate may identify that part of the work as requiring a site assessment.
How it works
From a Simple Description to a Project Estimate
BuildBot develops the preliminary project step by step. The questions and resulting scope change according to the bathroom work you describe.
A toilet replacement should not follow the same conversation as a complete renovation. BuildBot uses your answers to identify the relevant scope and the information still requiring confirmation.
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01
Describe the project
Tell BuildBot What You Are Planning
Begin with a straightforward description. You can enter a complete bathroom renovation, a single replacement or a combination of bathroom work.
Complete bathroom renovation Replace the toilet Retile the bathroom -
02
Relevant questions
BuildBot Clarifies the Required Work
The conversation gathers the details needed for the selected project, such as dimensions, existing fittings, retained or revised positions, finishes, product requirements and known site conditions.
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03
Scope development
The Preliminary Scope Is Calculated
BuildBot uses the confirmed information to identify relevant labour, building and installation materials, product allowances and other work connected with the requested bathroom project.
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04
Estimate prepared
Receive Your Preliminary Estimate
Review the proposed project description, estimated cost and the important assumptions, exclusions, dependencies and site checks connected with the result.
Initial project scope Estimated project cost Assumptions and exclusions Items requiring confirmation -
05
Next step
Request a Growchance Site Assessment
If you would like to proceed, send the project details and BuildBot reference to Growchance. We can then review the information, inspect the bathroom where required and begin preparing the confirmed project scope and quotation.
Where the BuildBot conversation and project reference are submitted with the enquiry, Growchance can use that information as the starting point for the next discussion and site assessment.
Built around the work
A Calculator That Understands the Project Scope
Traditional calculators often apply a broad rate to the room size. BuildBot takes a different approach by considering what you want removed, prepared, supplied, installed and finished.
A Broad Calculation
A basic calculator may use the bathroom size and a general specification level to produce a wide indicative range.
- Starts primarily with room size
- Applies a broad renovation category
- May overlook connected preparation
- May treat different projects similarly
A Scope-Based Estimate
BuildBot asks about the actual bathroom work and develops the preliminary project around the answers provided.
- Starts with the work you want completed
- Separates complete renovations from smaller jobs
- Considers connected labour and materials
- Identifies assumptions and required site checks
Practical examples
The Visible Product Is Only Part of the Work
The estimate can consider the connected work that may be needed to complete the selected bathroom job properly, based on the information available.
Standalone job
Replacing a Toilet
The project is not simply the price of the new WC. The preliminary scope may need to consider the work associated with removing and installing it.
- Existing WC removal
- Replacement WC allowance
- Normal connections
- Installation and fixing
- Sealing and testing
- Relevant waste removal
Surface work
Retiling a Bathroom
Retiling can involve more than the selected tiles. The existing finishes and required background preparation may materially affect the work.
- Existing tile removal
- Background preparation
- Tiling labour
- Tile allowance
- Adhesive, grout and trim
- Relevant waste removal
A larger refurbishment can also be developed around its individual components instead of relying only on a generic price per bathroom.
Your preliminary result
More Than Just a Number
Your BuildBot result can bring the estimated cost together with the scope, assumptions and practical information used to prepare it.
A Structured Preliminary Bathroom Estimate
The information shown will depend on the work selected, the answers supplied and whether any part of the project requires further inspection or confirmation.
- Initial project description
- Confirmed project details
- Labour allowance
- Material allowance
- Product allowance
- Preliminary estimated total
- Expected programme guidance
- Assumptions and exclusions
- Recommended preparation
- Proposed sequence of work
- Main risks and dependencies
- Recommended next actions
Where BuildBot cannot establish an important site condition from the conversation, the result should identify the missing information rather than present it as confirmed.
Project reference GC-BATH-TEST
Preliminary bathroom estimate
Initial Renovation Plan
Preliminary bathroom renovation estimate prepared from the information supplied during the BuildBot conversation.
Confirmed project details
Assumptions and missing information
Illustrative preview of the BuildBot PDF format using example figures. It is not a quotation or a real customer estimate.
When the result is ready, you can retain the preliminary estimate and, if you would like to proceed, submit the project details and reference to Growchance for review and a site assessment.
Important estimate information
Preliminary Estimate vs Final Quotation
BuildBot is designed to provide a useful early-stage estimate from the information supplied. It is not a substitute for inspecting conditions that cannot be confirmed online.
Some straightforward like-for-like bathroom work can be estimated from a clearly defined scope. Other projects depend on concealed pipework, drainage, electrical conditions, damaged backgrounds, access or what becomes visible after existing finishes are removed.
BuildBot Preliminary Estimate
Prepared from the project description, measurements, choices and site information supplied during the conversation.
- Provides an initial budgeting figure
- Records the work described by the customer
- Uses stated measurements and quantities
- Shows relevant assumptions and exclusions
- Identifies information requiring confirmation
Growchance Final Quotation
Prepared after the required project information, product choices and visible site conditions have been reviewed and the proposed scope has been defined.
- Defines the agreed project scope
- Reflects confirmed site information
- Records relevant products and allowances
- States known inclusions and exclusions
- Explains VAT and payment arrangements
Conditions behind the finishes
What May Require a Site Check?
These conditions can materially affect the work but may not be visible or measurable during an online conversation.
Pipework and Drainage
Concealed pipe routes, waste positions, drainage falls, isolation arrangements and the condition of existing connections may require inspection.
Walls, Floors and Substrates
Existing tiles can conceal damaged plaster, unsuitable boards, previous leaks, movement or floor construction requiring additional preparation.
Electrical and Ventilation Conditions
Existing wiring, circuits, bathroom zones, isolation, extractor routes and other electrical requirements may need an appropriate site assessment.
Product Compatibility
Dimensions, connection requirements, installation instructions and compatibility with the proposed layout must be checked for the selected products.
Access and Property Arrangements
Parking, upper-floor access, communal-area protection, working-hour restrictions, water isolation and waste arrangements may affect the project.
Concealed Damage
Some defects only become visible after the old bathroom, tiles or other finishes have been removed and the underlying construction is exposed.
Clear measurements, photographs, product information and accurate answers can help BuildBot prepare a more relevant preliminary scope.
Where an important detail cannot be established remotely, BuildBot can identify the issue so it can be reviewed before the final quotation is prepared.
Your project information and BuildBot reference can be sent to Growchance as the starting point for reviewing the bathroom and developing the confirmed project scope.
Why use BuildBot?
Plan Before You Ask for a Quote
BuildBot helps turn an initial bathroom idea into a more structured project before you decide whether to request a Growchance site assessment and quotation.
Understand Your Budget
Receive an early indication of what the work may cost before making major decisions about the bathroom layout, products or complete project.
- Review an initial project estimate
- See how the requested scope affects the budget
Define the Project Scope
Move beyond a general request for “a new bathroom” by recording the fittings, finishes, layout decisions and associated work you want considered.
- Separate retained items from proposed changes
- Organise complete and standalone bathroom work
Catch Commonly Missed Items
Preparation, connections, installation materials, protection and waste removal can affect the project even though they are less visible than the finished products.
- Consider work behind the visible finish
- Identify assumptions and missing information
Take the Next Step
When you are ready, submit the preliminary project and BuildBot reference to Growchance as the starting point for further review and a site assessment.
- Keep the initial project information together
- Continue from estimate to site assessment
The estimator can help you understand the initial scope without committing to a Growchance project. If you decide to move forward, the saved information can support the next conversation.
The preliminary estimate does not require you to proceed with Growchance. Any final quotation remains subject to confirmation of the required scope, site conditions and relevant project information.
Continue your research
Still Planning Your Bathroom Project?
Use the page that best matches your next question: explore Growchance’s bathroom renovation service or read the detailed London bathroom cost guide.
Planning a Complete Bathroom Renovation?
Explore how Growchance plans and coordinates bathroom strip-out, preparation, plumbing, electrical work, waterproofing, tiling, installation and final finishing across London.
Explore Bathroom RenovationWant to Understand Bathroom Costs?
Review bathroom renovation cost categories, scope, allowances, programme considerations, cost factors and practical budget-planning guidance for London projects.
Read the Bathroom Cost GuideThe service page explains how Growchance delivers bathroom projects. The cost guide supports general budget research. BuildBot provides the interactive preliminary estimate.
Helpful answers
Bathroom Renovation Calculator FAQs
Answers to common questions about using BuildBot, understanding the preliminary result and continuing the project with Growchance.
Provide accurate measurements and project details where possible. Unknown site conditions can remain identified for later inspection.
01 Is the bathroom cost calculator free?
Yes. You can use BuildBot to prepare a preliminary bathroom estimate without committing to a Growchance project. No account is required to begin the bathroom conversation.
02 Can I estimate only a toilet, bath or other individual job?
Yes. BuildBot can be used for standalone bathroom work as well as larger renovations. Describe what you want changed—for example, a toilet, bath, shower mixer, extractor fan, bathroom tiling or painting—and BuildBot should follow the relevant project flow.
03 Can BuildBot estimate a complete bathroom renovation?
Yes. You can describe a complete bathroom renovation involving strip-out, preparation, plumbing, electrical work, ventilation, waterproofing, tiling, sanitaryware, furniture, decoration and final finishing. The resulting scope will depend on the answers and project information supplied.
04 Does the estimate include labour, materials and products?
Where applicable, the preliminary estimate can include labour, building and installation materials, and standard product allowances relevant to the confirmed scope. Check the result’s assumptions, exclusions and price categories so you understand what has and has not been included.
05 Can BuildBot price concealed or hidden problems?
Not reliably where the condition cannot be seen or confirmed. Concealed pipework, drainage routes, damaged substrates, previous leaks and inaccessible electrical work may require inspection. BuildBot should identify important uncertainty rather than assume that the hidden condition is known.
06 Is the BuildBot result a final Growchance quotation?
No. It is an initial budgeting and project-planning estimate based on the information provided. A final Growchance quotation is prepared after the required scope, products, site information and relevant existing conditions have been confirmed.
07 What happens after I receive the estimate?
You can review and retain the preliminary estimate. If you would like Growchance to assess the project, submit the project details and BuildBot reference so the information can support the next discussion and any required site assessment.
08 Does Growchance undertake bathroom projects across London?
Growchance provides bathroom renovation and associated building services across London. Availability depends on the property location, proposed scope and current work schedule. Visit the Bathroom Renovation London service page for more information.
Start planning your bathroom
Ready to Find Out What Your Bathroom Project Could Cost?
Tell BuildBot what you would like to change. It will guide you through the relevant questions and prepare your personalised preliminary bathroom estimate.
Your result is a preliminary estimate for planning and budgeting. A final Growchance quotation requires confirmation of the relevant scope, products and site conditions.
Begin the bathroom conversation without creating an account.
Estimate an entire renovation or individual bathroom jobs.
Submit the project reference if you want a site assessment.