If you’re planning to renovate a three-bedroom house in Surrey or South West London, one of your first questions is probably: how much is this going to cost?
It’s a perfectly reasonable question, although not always an easy one to answer.
A three-bedroom Victorian terrace in Wandsworth might have ageing electrics, uneven floors and a kitchen layout that hasn’t worked well for decades. A semi-detached house in Esher could have a similar floor area but need little more than new finishes, an updated bathroom and some decorating.
Both are three-bedroom houses. Yet the amount of work involved, and the final cost, could be very different.
At Smart Maintenance+, we carry out property refurbishments across Surrey and London. We’ve put together this guide to help homeowners understand what drives renovation costs, how to put together a sensible budget and what to check before inviting builders to quote.
How Much Does a Three-Bedroom House Renovation Cost in 2026?
As a broad starting point, published 2026 London renovation guides suggest that cosmetic refurbishments can cost around £350–£800 per square metre, while more substantial whole-house renovations can fall within a much wider range of £800–£2,500 per square metre or more.
These are general market benchmarks, not Smart Maintenance+ quotations. Different guides include different work and treat VAT differently, so they should only be used for initial budgeting.
Let’s take a hypothetical three-bedroom house with 100 m² of internal floor space.
| Type of renovation | Indicative cost for 100 m² | Typical work involved |
|---|---|---|
| Cosmetic refurbishment | £35,000–£80,000 | Painting, decorating, flooring, repairs and selected improvements |
| Substantial house renovation | £80,000–£180,000 | More extensive refurbishment, potentially including new kitchens, bathrooms and upgrades to services |
| Complex or high-specification renovation | £180,000–£250,000+ | Major alterations, extensive service replacement, specialist finishes and more complicated building work |
These are illustrative calculations based on broad published London market ranges, not verified prices for a specific Surrey property. They are not all-inclusive quotations. Professional fees, approvals, temporary accommodation, contingency, extensions and VAT treatment need to be considered separately.
The important thing to understand is that the extent of the work matters much more than the number of bedrooms.
A house that needs decorating throughout is a very different project from one that needs a new heating system, full rewiring, two bathrooms, a kitchen and changes to internal walls.
And sometimes, what looks like a simple renovation turns out to be more complicated once the old fittings and finishes come off.
Start With the House, Not the Budget Spreadsheet
Before thinking about worktops, bathroom tiles or wall colours, it’s worth walking through the property carefully.
When looking at a house that’s due for refurbishment, we’re interested in more than what needs to look better. We want to understand how the building is working.
Are the walls and floors in good condition? Is the heating system doing its job? Are there signs of previous leaks? Can the existing kitchen layout be improved without moving all the plumbing?
Those questions can have a greater impact on the budget than the choice between two ranges of kitchen cabinets.
We recommend dividing the work into three categories.
1. Essential Repairs
These are problems that need attention, whether or not you’re planning a renovation.
They might include water damage, faulty electrical installations, leaking pipes, deteriorated timber or poor ventilation.
Some issues are visible straight away. Others only become apparent after carpets, cabinets or damaged finishes have been removed.
Essential repairs should take priority because there’s little sense in installing expensive new flooring over a subfloor that needs replacing.
2. Planned Improvements
These are the changes that will make the property more comfortable, practical and attractive.
You might want to replace the kitchen, refurbish a bathroom, improve the lighting, install new flooring or redecorate the entire house.
It’s worth deciding which improvements will make the biggest difference to daily life.
For a family with young children, additional storage and durable flooring may be more useful than expensive decorative features. For someone planning to stay in the property for another 20 years, improving the layout, heating and long-term practicality could be more important.
3. Optional Upgrades
These are the features you’d like, but could postpone if the budget becomes tight.
Perhaps it’s bespoke joinery, premium kitchen worktops, a more elaborate lighting scheme or additional fitted storage.
There’s nothing wrong with including these improvements. Just make sure they don’t take money away from the work that really needs doing.
Why Two Three-Bedroom Houses Can Have Completely Different Renovation Costs
Beyond the size of the property, there are several things that can make a substantial difference to the quotation.
The Age and Condition of the Property
Many Victorian and Edwardian homes in South West London have been altered and refurbished repeatedly over the years.
That’s not necessarily a problem, but it means the condition of the building may be less straightforward than it first appears.
An older house might have uneven walls, several generations of plumbing or floors that need more preparation than expected.
A newer property may be simpler to work on, although it can have its own issues.
The key is not to assume that every older house needs extensive work, or that a newer one will always be cheaper to renovate.
The Amount of Plumbing and Electrical Work
Replacing kitchens and bathrooms is often one of the largest parts of a renovation budget.
But the cost isn’t just about the new fittings.
If a kitchen is staying in the same position and the plumbing is in good condition, installation may be relatively straightforward.
Move the kitchen to another room, however, and you may need new water supplies, drainage, electrical circuits, ventilation and substantial changes to the floors and walls.
The same principle applies to bathrooms.
Even moving a toilet by a short distance can become complicated if the waste pipe cannot be rerouted easily.
Changing the Layout
Removing a non-load-bearing partition is not the same as creating a large opening in a structural wall.
If a wall is load-bearing, structural engineering input and properly designed support may be necessary. That can introduce steelwork, building control involvement, additional making good and potentially party wall procedures.
It’s important to establish what is structurally possible before spending too much time developing a new layout.
The Standard of Finishes
There’s a considerable difference between a practical, durable refurbishment and a completely bespoke interior.
Both can look excellent.
The difference is often in the amount of preparation, installation time and specialist labour required.
A standard kitchen and a bespoke kitchen may serve the same basic purpose, but custom cabinetry, specialist worktops and integrated features can change the budget significantly.
The same is true of bathrooms, flooring, doors and decorative finishes.
Access and Working Conditions
In Surrey, some properties have driveways, garages and convenient access for deliveries.
In parts of Wimbledon, Richmond, Wandsworth and Clapham, contractors may be working on terraced streets with restricted parking and limited space to store materials.
These details aren’t always obvious to homeowners, but they matter when organising deliveries, removing waste and scheduling trades.
Even a modest difference in access can affect the amount of labour involved.
What Should a House Renovation Budget Include?
One of the easiest mistakes is to concentrate on the visible parts of the renovation and overlook the work required to get there.
A useful budget should follow the project from the initial investigations right through to final handover.
| Budget category | What to include |
|---|---|
| Surveys and design | Measured surveys, drawings, structural advice and specialist investigations where required |
| Site preparation | Protecting existing areas, removing old fittings, strip-out and waste disposal |
| Building work | Repairs, wall alterations, structural work and changes to openings |
| Electrical work | Wiring, consumer unit upgrades where needed, sockets, switches and lighting |
| Plumbing and heating | Pipework, radiators, heating alterations, drainage and ventilation |
| Kitchen | Units, worktops, appliances, delivery, plumbing, electrics and installation |
| Bathrooms | Sanitaryware, plumbing, waterproofing, tiling, ventilation and installation |
| Interior finishes | Plastering, flooring, carpentry, painting and decorating |
| Completion | Testing, relevant certification, snagging, cleaning and making good |
It’s worth asking one simple question about every item: does this price include both the product and the work needed to install it?
For example, a £12,000 kitchen allowance might sound generous. But does it include appliances? Worktops? Installation? Electrical alterations? Disposal of the old kitchen?
If those items are excluded, the finished kitchen may cost considerably more than the initial allowance suggests.
This is why we recommend asking for a clear, itemised quotation rather than relying on a single headline figure.
A Real Example: First-Floor Refurbishment in Epsom
Not every substantial refurbishment involves rebuilding an entire property.
At Smart Maintenance+, we completed a first-floor refurbishment in Epsom, Surrey, with a published project budget of £25,000.
The work covered four bedrooms, the family bathroom, the staircase and a downstairs toilet.
It included new flooring, painting and decorating, and radiator upgrades.
This wasn’t a full-house renovation involving complete rewiring, replumbing or major structural alterations. It was a more focused programme of improvements.
And that’s precisely why it’s worth defining the scope of a project before comparing budgets.
A partial refurbishment like this cannot be directly compared with a three-bedroom house that needs every room, service and finish replaced.
See our completed first-floor refurbishment in Epsom.
How to Plan a £120,000 House Renovation Budget
Let’s imagine you have £120,000 available in total to renovate your home.
It’s tempting to tell a contractor that’s your building budget. But if you commit the whole amount to construction, what happens when something unexpected comes up?
A better approach is to separate the money into three parts.
| Budget allocation | Amount |
|---|---|
| Construction and refurbishment, including applicable VAT | £100,000 |
| Contingency for unforeseen work | £12,000 |
| Professional fees, surveys, storage and other project expenses | £8,000 |
| Total available budget | £120,000 |
This is a hypothetical example of how to allocate available funds, not a quotation for a three-bedroom house.
The £12,000 contingency is equivalent to 10% of the total budget. For an older property or a renovation with significant unknowns, a larger reserve may be sensible.
The important point is to keep this money separate.
If part of the contingency isn’t needed, you can always decide later whether to use it for optional improvements.
It’s much harder to do the opposite after you’ve already committed to expensive finishes.
What If the Initial Quotation Exceeds Your Budget?
This happens more often than homeowners expect.
The answer isn’t necessarily to reduce the quality of everything.
Instead, work through the scope and ask which elements could be simplified, postponed or completed in a later phase.
For example:
- Could the existing kitchen layout be retained?
- Are all the proposed wall alterations necessary?
- Does every room need new flooring?
- Could some sound doors and joinery be repaired rather than replaced?
- Are there bespoke items that could be replaced with good-quality standard products?
These are decisions worth making before work starts, while there’s still flexibility in the programme.
Which Decisions Should You Make Before Renovation Work Starts?
Some decisions are easy to change on paper and expensive to change on site.
Moving a light switch on a drawing takes moments. Moving it after the walls have been plastered and painted is another matter.
The same goes for kitchen layouts, drainage positions, floor levels and bathroom fittings.
Before the project begins, try to agree the following:
- Room layouts: Decide where the major fittings, partitions and furniture will go.
- Kitchen and bathroom specifications: Select the main products and agree their installation requirements.
- Lighting and electrics: Confirm socket positions, switches, lighting layouts and any special electrical requirements.
- Flooring: Agree materials, thicknesses and transitions between rooms.
- Material responsibilities: Establish who will order, receive, store and inspect materials.
- Changes and substitutions: Agree how any proposed changes will be approved and priced.
Not every detail needs to be settled months in advance.
But the more decisions you can make before the relevant trade starts, the less chance there is of paying to undo completed work.
How Long Does It Take to Renovate a Three-Bedroom House?
A house renovation is a sequence of connected jobs. The order matters.
Electrical and plumbing work usually need to happen before the walls are finished. Waterproofing must be completed before bathroom tiling. Kitchen installations depend on accurate measurements and properly prepared surfaces.
For a substantial whole-house refurbishment, around 12–24 weeks on site can be a useful initial planning range, although simpler projects may be quicker and complicated structural renovations can take longer.
A typical sequence might look like this:
| Stage | Typical work |
|---|---|
| 1. Preparation | Site protection, strip-out and waste removal |
| 2. Building work | Structural alterations, repairs and layout changes |
| 3. First fix | Electrical wiring, plumbing and heating infrastructure |
| 4. Walls and floors | Plastering, levelling and surface preparation |
| 5. Installation | Bathrooms, kitchens, carpentry and flooring |
| 6. Finishing | Painting, decorating, final fittings and testing |
| 7. Handover | Final checks, snagging and relevant documentation |
The stages can overlap, and the actual programme depends on the property.
Lead times for windows, kitchens, bespoke joinery and specialist materials can also affect the schedule.
One practical suggestion: ask your contractor not only when the job can start, but also which materials and decisions must be ready before each stage begins.
That question can prevent a surprising number of delays.
Should You Move Out While Renovating?
This depends on the scale of the work and how comfortable you are living around building activities.
If you’re redecorating bedrooms or replacing flooring one room at a time, remaining in the house may be manageable.
A full refurbishment involving kitchen removal, bathroom works, rewiring and plumbing is different.
You may be without cooking facilities, hot water or parts of the electrical installation for periods of time. There will also be dust, noise and regular movement of workers and materials.
In some cases, trying to keep the property occupied can slow the work because contractors need to maintain access to particular rooms and make temporary arrangements.
Discuss this before the project begins, particularly if you have young children, pets or work from home.
If temporary accommodation is necessary, include it in the overall budget rather than treating it as an afterthought.
How to Compare Quotes From Different Builders
It’s perfectly sensible to obtain more than one quotation.
The challenge is making sure you’re comparing the same thing.
Imagine one contractor quotes £85,000 and another quotes £105,000.
At first glance, the choice seems straightforward.
But what if the first quotation excludes waste disposal, bathroom fittings, part of the electrical work and final decoration?
Those items can quickly narrow the apparent difference.
To make quotations easier to compare, provide each contractor with the same brief, drawings and specifications wherever possible.
Then look carefully at:
- What is included in the agreed scope.
- Which materials are included and which you need to supply.
- Any provisional sums or allowances for work not yet fully specified.
- Exclusions, such as specialist surveys, unforeseen repairs or external works.
- Who arranges waste disposal and site protection.
- What happens if the scope changes during construction.
- The proposed payment schedule and expected completion date.
- Whether VAT is included and what the total payable amount will be.
A well-prepared quotation should help you understand how the price was reached.
And if something isn’t clear, ask.
It’s always easier to resolve a question before signing than after the work has started.
Building Regulations, Planning Permission and VAT: What Should You Check?
These aren’t the most exciting parts of planning a renovation, but they’re important.
Building Regulations
Certain renovation works may require Building Regulations approval or notification through an appropriately registered competent person.
Examples can include structural alterations, electrical work, heating-system changes, replacement windows and some plumbing work.
Planning permission and Building Regulations approval are separate matters.
You can read more in the official GOV.UK guidance on Building Regulations approval.
Planning Permission and Party Walls
Most straightforward internal refurbishments do not require planning permission.
However, extensions and certain external changes may need permission or confirmation that permitted development rights apply.
If you are altering a shared structural wall or carrying out certain works near a neighbouring property, the Party Wall etc. Act 1996 may also apply.
This is particularly relevant to some terraced and semi-detached houses in South West London.
The government provides a useful guide to party walls and building work.
It’s best to investigate these requirements before committing to the construction schedule.
VAT on Renovation Work
Most ordinary renovation work supplied by VAT-registered builders is subject to VAT at the standard rate of 20%, although qualifying exceptions exist.
Make sure your quotation clearly states whether VAT is included and how it applies.
There are special VAT rules for certain types of work and qualifying properties, including some long-empty homes. These should be checked rather than assumed.
You can find further details in the government’s VAT guidance for builders.
What Happens at the End of a Renovation?
A renovation isn’t quite finished when the last coat of paint goes on.
Before handover, the contractor and homeowner should review the completed work and identify anything that still needs attention.
This might include adjusting doors, touching up paintwork, checking fittings or resolving small finishing defects.
It’s also worth confirming that you’ve received the relevant documentation for the work carried out, which may include electrical certificates, building control documentation, product information and warranties where applicable.
Keep these documents somewhere safe. They may be useful for future maintenance, insurance or when selling the property.
Frequently Asked Questions
Can I renovate a three-bedroom house for £50,000?
Possibly, if the property is in relatively good condition and the work is limited to decorating, flooring, repairs and selected improvements.
A complete renovation involving new kitchens, bathrooms, wiring, heating and major alterations is likely to require a substantially larger budget.
The scope of work matters more than the number of bedrooms.
Is it cheaper to renovate the whole house at once or room by room?
If several rooms need extensive electrical, plumbing or plastering work, coordinating the work as one project can reduce repeated preparation, disruption and contractor visits.
However, renovating in stages may suit homeowners who want to remain in the property or spread expenditure over time.
The most economical approach depends on how much work is planned and which trades need access to the same areas.
Do I need an architect for a house renovation?
Not always.
If you’re replacing bathrooms, updating kitchens or redecorating without significant layout changes, you may not need a full architectural design service.
If you’re planning extensions, substantial structural changes or complicated alterations, an architect, architectural designer, structural engineer or other qualified professional may be needed, depending on the work.
How much contingency should I allow?
A reserve of around 10–15% is a reasonable starting point for some renovation budgets, but it is not a universal rule.
Older houses, extensive structural works and projects with limited access for investigation may justify a larger contingency.
The purpose is to provide financial flexibility if the work reveals something unexpected.
What is the biggest mistake homeowners make when budgeting?
One common mistake is agreeing a budget for finishes before understanding the condition of the property and the full scope of the building work.
Another is comparing quotations that do not include the same services, materials and responsibilities.
A clear specification and realistic allowance for the less visible parts of the project can help avoid both problems.
Planning a Three-Bedroom House Renovation in Surrey or South West London?
If there’s one piece of advice we’d give before starting a renovation, it’s this: understand the house and agree what needs doing before committing to the finishes.
A sensible budget starts with a site survey, a clear description of the work and an honest discussion about priorities.
At Smart Maintenance+, we manage property refurbishment and improvement projects across Surrey and London, coordinating the different trades and keeping homeowners informed throughout.
Whether you’re planning a focused refurbishment or a more extensive renovation, we’re happy to discuss what you’re trying to achieve.
It helps if you can share photographs, any existing drawings, the property location and an idea of your budget and preferred timescale.
We’ll use that information to understand the project and discuss the next steps.
Call: 07415 682276
Email: info@smartmaintenanceplus.co.uk
Learn more about our full property refurbishment services in London and Surrey, or see how we work across the county on our property refurbishment in Surrey page.