House Renovation Costs in the UK: The 12-Stage Cost Breakdown

Buying a property that needs a full refurbishment can be a project that leads to a solid return on investment. However, there can be numerous pitfalls along the way, so it’s not something that should be taken on lightly. Comprehensive budgeting, supported with flexible and cost-effective finance, is at the centre of an efficient renovation and vital to ensure the investment meets its potential.

At Clifton Private Finance, we offer our customers advice and access to tailored debt-finance solutions that help minimise funding costs and keep the project on track. From rapid bridging finance and bespoke development funding to mortgages that cover both property purchase and renovation costs, we can offer staged lending that meets your exact budgeting requirements.

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Ballpark Budgeting for House Renovations

Ask a professional contractor how much it’s going to cost to renovate a house, and they’ll give a look, often followed by a comment like ‘how long is a piece of string’. Honest, perhaps, but unhelpful.

Yes, it’s impossible to give an accurate figure for house renovation costs before the work begins. There are simply too many unknowns to consider:

• Perhaps a wall that was thought stable shows structural damage once the plaster is off
• Or the costs assumed one material when another ended up being used
• Maybe the plans for the garden had to be reconsidered when underground pipes were discovered
• Or a sudden change of direction midway through to make the kitchen/diner open plan shakes up the project

Nonetheless, the one thing most of us want to know from the outside is a ‘ballpark’ figure - an estimate you’re not going to hold the contractors to, but that allows you to plan the budgeting.

To calculate, we need to know one key factor: Gross Development Value (GDV)

Experienced developers suggest that the cost to fully refurbish a property is between 15% and 30% of GDV, depending on the scale of the project. Houses that are basically shells when you start will sit between 25% and 30%, while those that need a little less work may come in at 15% to 20%.

Some example figures:

Estimated House Renovation Costs

GDV	Level of Renovation	Factor	Estimated Renovation Cost
£200,000	Complete	30%	£60,000
£300,000	Moderate-Heavy	25%	£75,000
£500,000	Light	15%	£75,000
£500,000	Moderate	20%	£100,000
£500,000	High, Premium	30%	£150,000

While ballpark figures such as this are merely a guide, they can help significantly with initial budgeting and finance preparation, setting expectations from the start.

Cost of Renovations vs. Total Project Cost

When budgeting, it’s essential that you differentiate between the cost of renovations, which is the total cost of materials and labour to do the work, and total project cost, which includes the cost of renovations as well as other factors such as:

• Property purchase
• Stamp Duty Land Tax (SDLT)
• Finance costs
• Legal and architect fees
• Planning permission
• Capital Gains Tax (CGT) - if property is sold
• Budgeting contingency

To fully calculate the project for viability and return on investment (ROI), the total project cost should be used rather than a ballpark cost of renovations.

Costing the Stages of House Renovation

While the ballpark figure provides an overall idea for the cost of renovations, it is only through careful understanding of each stage of renovating that a more accurate estimate can be obtained.

Planning your desired finish from the outset will let you explore the options, and special attention should be given to scale. It’s very easy to say ‘oh, it’s only a few quid more’ when looking at the higher-quality version of a single item, without realising that over hundreds, and even thousands of individual pieces may be needed, greatly increasing the final costs.

Stage 1: Planning

Depending on the scale of your project, planning and professional input can have a clear cost implication.

You may need:

• Planning permission: Always check if planning permission is required, and always obtain the right planning permission before beginning any renovation project.
• Architects: The level of architectural work scales with different projects. For lower-end projects, often experienced senior contractors will provide advice on layout and ensure ideas are feasible.
• Structural engineer input: Where walls are removed or other significant structural considerations are needed, a structural engineer’s involvement is essential.
• Legal advice: Typically only used for high-end projects.

Existing surveys, obtained as part of the purchase process, should be available for use during the planning stage.

Stage 1 Costs - Planning

Level	Description	Typically Includes	Cost
Very Light	Builder-led refurbs without architect involvement or planning permission	Contractor advice and support.	£0 to £1,500
Light	Suitable for internal changes without full planning permission.	Architect or designer work, brief structural advice.	£1,500 to £3,000
Moderate	Standard level of planning for refurbs, including extensions and layout changes.	Architect drawings, planning application, structural advice, and revisions.	£3,000 to £7,500
High	Complex, design-led planning for large extensions and full shell redevelopments.	Full architectural service, multiple revisions, planning consultant, legal advice.	£8,000 to £15,000

Stage 2: Demolition

A knockdown rebuild is one where the entire property is demolished and a new one is built in its place. These projects are outside the scope of this renovation guide, which assumes full demolition is not desired.

Demolition costs can vary wildly due to considerations such as property location, access, party wall considerations, and waste removal. Extra complications, such as the discovery of asbestos, can increase demolition costs considerably but will usually be identified in advance in the property survey.

Stage 2 Costs - Demolition

Level	Description	Cost
Light	Small-scale demolitions, such as removal of internal walls, garden outbuildings, lean-tos, and smaller garages.	£1,000 to £3,000
Moderate	Removal of a single-storey extension.	£2,000 to £5,000
High	Two-storey extension demolition or complex structures.	£4,000 to £15,000+

Stage 3: Strip Out

The property strip out, or internal demolition, is the stage where the property is cleaned of old, unwanted effects.

This typically includes:

• Removing fixtures and fittings
• Dismantling partition (stud) walls, ceilings and floors
• Stripping out electrical wiring, plumbing, and central heating
• Removing all carpets, tiles, and insulation
• Waste disposal and recycling

The strip out will bring the building to a clean, shell-like state ready for your renovation work to commence.

Strip outs are typically costed per m², with prices averaging from £15 to £25 per m² in most areas. However, this fee rarely covers the waste disposal stage, which is priced as an additional cost. Waste removal can add as much as 20% to 40% to the strip out cost, depending on locality and the volume and type of materials needing disposal.

Stage 3 Costs - Strip Out

Size	Strip out base cost	Cost inc. waste disposal
Small 2-bed terraced house: ≈70 m²	£1,050 to £1,750	£1,260 to £2,450
Medium 3-bed semi-detached home: ≈100 m²	£1,500 to £2,500	£1,800 to £3,500
Large 4+ bed detached property: ≈175 m²	£2,625 to £4,375	£3,150 to £6,125

Stage 4: External and Structural Works

The next stage is to ensure the structure of the building is brought to the required level, meeting all guidance and safety requirements.

Depending on the initial state of the property, this may include repairs or replacement to:

• Roof
• External walls
• Windows and doors
• External solid-wall insulation
• Structural openings (steels in load-bearing walls)
• Damp proofing course (DPC)
• Foundations
• Drainage

Budgeting for these structural works varies wildly. In some properties, work needed will be minimal (and often zero), while in others a complete refit will be required. Considerations such as location, materials used, and access can also lead to a wide range of figures. Roofs, for example, can be done with traditional felt, which is more cost-effective but won’t last as long as premium alternatives such as slate or flat roof GRP (fibreglass). Professional labour in London may be twice the cost of that quoted in other locations.

All figures, therefore, are illustrative examples to help guide your decision before you can get an accurate quote.

Stage 4 Costs - External and Structural

Size	Roof	Walls	Solid-Wall Insulation	Windows/Doors	Openings	DPC	Foundations	Drainage
Small 2-bed terraced house	£3,000 to £7,500	£1,000 to £4,000	£3,000 to £8,000	£1,500 to £5,000	£2,000 to £5,000	£1,000 to £3,000	£0 to £5,000	£1,000 to £3,000
Medium 3-bed semi-detached home	£5,000 to £10,000	£2,000 to £6,000	£6,000 to £12,000	£2,500 to £8,000	£3,000 to £7,000	£1,500 to £5,000	£0 to £8,000	£1,500 to £4,000
Large 4+ bed detached property	£8,000 to £15,000	£3,000 to £10,000	£9,000 to £16,000	£8,000 to £15,000	£5,000 to £12,000	£2,000 to £7,000	£0 to £15,000	£2,000 to £5,000

It’s important to note that not all item repairs will be needed for all properties - most projects will involve only a few of the works listed.

Stage 5: First Fix

The ‘first fix’ stage covers the installation of the building infrastructure - plumbing, heating, and wiring:

• Electrical

               New cabling

               Positioning for sockets and lights

               Consideration for appliance connections

• Plumbing

               Hot and cold water pipework

               Waste water piping

               Relocating bathroom or kitchen if required

• Heating

               Pipework for radiators

               Underfloor heating

               Repositioning boiler if required

• Ventilation

                Bathroom and kitchen extraction fans 

                Ventilation ducting to manage building airflow

The first fix consists of the work that goes behind the walls and must be in place before any wall coverings or plasterwork is done.

Stage 5 Costs - First Fix

Size	Electrical	Plumbing	Heating	Ventilation
Small 2-bed terraced house	£2,000 to £4,000	£2,000 to £4,000	£2,000 to £5,000	£500 to £1,500
Medium 3-bed semi-detached home	£3,500 to £8,000	£3,000 to £7,000	£3,000 to £8,000	£750 to £2,000
Large 4+ bed detached property	£5,000 to £10,000	£5,000 to £10,000	£5,000 to £12,000	£1,000 to £3,000

As with previous works, the nature of your project will mean that some first fix stages are not required, while others need greater levels of focus.

Stage 6: Insulation

Energy efficiency is an essential component of modern home renovations. Internal insulation occurs after the first fix but before the walls are finalised, turning the cold shell of the building into a warm environment suitable for a home.

Internal insulation may include:

• Internal solid-wall insulation
• Cavity wall insulation
• Floor insulation
• Ceiling insulation
• Loft insulation

Properties with external solid-wall insulation will have had this included in the structural stage as part of external wall works.

While higher quality insulation comes with a greater initial cost, energy bills will be cheaper in the long run - making the property more attractive to potential buyers.

Stage 6 Costs - Insulation

Size	Cost *
Small 2-bed terraced house	£1,500 to £7,500
Medium 3-bed semi-detached home	£2,500 to £10,000
Large 4+ bed detached property	£4,000 to £14,000

* the wide cost range for insulation shows the difference between low cost cavity wall insulation, and higher cost internal solid-wall insulation.

Stage 7: Plastering

Plastering is when the building starts to take proper shape and look like a habitable home. The walls and ceilings are boarded, and the surface skimmed to be smooth, ready for decorating.

Plastering work includes:

• Boarding and skimming walls and ceilings
• Patching walls where repairs are needed
• Making good after electrical and plumbing first fix works

Stage 7 Costs - Plastering

Size	Cost
Small 2-bed terraced house	£3,000 to £7,000
Medium 3-bed semi-detached home	£4,000 to £9,000
Large 4+ bed detached property	£6,000 to £13,000

Stage 8: Second Fix

The second fix is the post-plastering electrical, plumbing, and heating work. It prepares the kitchen and bathroom for full fitting, and completes the power and heating for other rooms:

• Kitchen plumbing and oven fittings
• Bathroom plumbing and waste
• Fixtures fitted
• Light fittings
• Power sockets
• Radiator fittings
• Underfloor heating
• Internal doors

Stage 8 Costs - Second Fix

Size	Electrical	Plumbing	Heating	Other (doors, vents)
Small 2-bed terraced house	£1,000 to £2,500	£1,500 to £3,000	£1,000 to £2,500	£1,000 to £2,500
Medium 3-bed semi-detached home	£1,500 to £3,500	£2,000 to £4,000	£1,500 to £3,500	£1,500 to £3,500
Large 4+ bed detached property	£2,500 to £5,000	£3,000 to £6,000	£2,500 to £5,000	£2,000 to £5,000

Often a new boiler is fitted as part of the second fix, typically adding from £2,000 to £5,000 to the total cost.

Stage 9: Kitchen

Installing a new kitchen is a major part of a modern renovation and forms a substantial part of the budget. A full kitchen refit may include appliances as well as cabinets and units. Individual choices, such as worktop material, cabinet fronts, and the quality of appliances will significantly impact the kitchen budget.

Stage 9 Costs - A: Kitchen Installation

Level	Description	Cost
Light	Basic kitchen with low-cost laminate worktop, fewer cabinets.	£5,000 to £8,000
Moderate	Family kitchen with durable surfaces and good storage.	£8,000 to £15,000
High	Luxury kitchen, stone or natural wood countertops, and a range of top-quality cabinets.	£15,000 to £30,000+

Stage 9 Costs - B: Appliances (installed)

Level	Description	Cost
Light	Basic white goods	£1,500 to £3,000
Moderate	Mid-range branded appliances	£3,000 to £6,000
High	Premium appliances	£6,000 to £12,000+

Stage 10: Bathroom

With a huge range of possible bathroom options, the scope for bathroom budgets is wide. Options such as luxury baths or powerful pumped showers represent the higher range, while basic shower-and-toilet rooms serve adequately in smaller homes.

Bathroom fitting includes:

• Bathroom suite and cabinets
• Installation
• Tiling
• Flooring
• Lighting
• Sealing, ventilation, and waterproofing

Accessibility considerations can also increase cost, with walk-in showers / wet rooms a popular choice for the elderly or less able.

Stage 10 Costs - Bathroom

Level	Description	Cost
Light	Small functional bathrooms	£3,000 to £6,000
Moderate	Family bathroom	£6,000 to £10,000
High	Luxury bathroom	£10,000 to £18,000+

Figures shown are per bathroom. Properties with multiple bathrooms should cost each individually for budgeting.

Stage 11: Flooring and Decoration

With the property approaching completion, flooring and decoration forms the final main stage for budgeting. Contractors will approach these two sections simultaneously, with hard floors such as tiles or stone needing to be installed before final decoration, while other floor types, such as carpets, are fitted after walls are finished.

For budgeting purposes, each should be considered separately.

Stage 11 Costs - A: Flooring

Size	Cost*
Small 2-bed terraced house	£2,000 to £5,000
Medium 3-bed semi-detached home	£3,000 to £8,000
Large 4+ bed detached property	£5,000 to £15,000

* Note that high-end flooring, such as luxury stone, can increase costs considerably above these estimates.

Stage 11 Costs - B: Decorating

Size	Cost
Small 2-bed terraced house	£2,000 to £4,000
Medium 3-bed semi-detached home	£3,000 to £6,000
Large 4+ bed detached property	£5,000 to £10,000

Stage 12: Final Snagging and Completion

With the building almost completely renovated, a final stage of checking the work and fixing any minor issues (snagging) takes place. This will be included in the overall cost from the contractors, though setting aside a small contingency between 0.5% and 1% GDV to cover any minor costs is sensible.

Financing Your House Renovation

For many people without the existing savings or other capital needed to fund a full house renovation, debt-based finance provides the answer. Leveraging the equity in the house to increase its value is a valid and sensible way to raise the money needed, with the costs involved in the finance often easily balanced against the potential profit made from the renovation.

Debt finance for house renovations exists in both short-term and long-term solutions, each tailored to different needs.

Short-term Finance Provides:

• Speed
• Flexibility
• Property value boosts

Long-Term Finance Offers:

• Stability
• Affordability
• Ongoing ownership

Matching the right finance to your project plans helps you keep costs down, reduces risk, and provides the flexibility needed to see the renovation to completion.

Short-Term Finance

Short-term renovation finance serves multiple needs, offering flexibility and immediacy that’s balanced by higher interest rates. Properly configured, short-term finance is perfect for renovators looking to get a quick return on investment through sale once the renovations are complete, or for those seizing current opportunities with an eye to refinancing later.

Examples for short-term finance use include:

Auction Finance with Renovations

Designed to allow you to move at a rapid rate, tailored bridging finance developed for auctions gives you the funding needed to purchase a discounted property, as well as providing the capital required for key renovations. Once renovations are completed, the property can be sold on, or ‘flipped’ for profit, or refinanced with a mortgage for owner-occupancy or rental.

Obtaining Uninhabitable Properties

Short-term bridging finance operates with different criteria to mortgages, allowing it to be used to purchase and renovate properties that are outside mortgage restrictions. This includes rundown properties missing a kitchen or bathroom, or those requiring structural work.

Large-scale renovations

Staged development finance can be put in place to provide cash injections at designated checkpoints, reducing the amount of interest generated while keeping a complex renovation project on track.

Emergency funding

Short-term additional funding can be acquired to plug gaps when existing funding falls short. This may be because stages exceed the budget allocated, or because unforeseen circumstances cause delays that require reassessment and reconfiguration of the project plan.

Long-Term Finance

Long-term solutions give you the capital needed to pay for renovations using existing property equity to secure low interest rates and affordable monthly repayments. These are ideal when you are renovating a property you already own, either as an owner-occupier or landlord.

Long-term finance is also often used to restructure existing short-term finance, changing the debt landscape from the renovation project to long-term use.

Examples for long-term finance include:

Renovating Your Home

A standard modernisation and refurbishment of your current home is often done through long-term finance, typically either a remortgage or second-charge loan secured on the home (homeowner’s loan). These raise capital based on your existing equity and allow you to improve your home and boost its market value without putting a strain on current mortgage outgoings.

Refinancing Bridging Finance

If bridging finance has been used to obtain a property at speed, or to renovate an uninhabitable property, then it can be replaced with a mortgage once the renovations are complete to move to a long-term plan of ownership. This is perfect for both those looking to move into the newly refurbished home, or for landlords seeking to rent out their new investment for the future.

Portfolio Management

Landlords who own multiple properties can explore portfolio mortgage options, which provide significant capital to both purchase and renovate homes by using existing equity as collateral. Portfolio mortgages open new growth opportunities for career landlords, allowing you to renovate and modernise properties to maximise rental income.

Accessibility Renovations in Retirement

Retired homeowners looking to improve accessibility with external ramps and landscaping, door widening and wheelchair access, or walk-in showers can unlock equity in the home through lifetime mortgages. Designed with no monthly repayments and a single exit repayment once the house is sold, lifetime mortgages provide opportunities for asset-rich, cash-poor homeowners to get the capital you need to renovate and adapt your home in later life.

House Renovation Funding with Clifton Private Finance

At Clifton Private Finance, we work with you to prepare and fund your home renovation project. Our advisers have the expertise you need to obtain the right funding. Together we will:

• Explore your project scope
• Define project funding checkpoints
• Evaluate existing equity and capital
• Compare finance options

Your Clifton Private Finance adviser will match you to a lender who is best suited for the project, balancing fees and costs against the flexibility you need. We will make sure your debt finance is properly tailored to your timeline and budget.

From staged bridging finance solutions that lead into a well-defined mortgage-based exit strategy, to homeowner loans that leverage your existing investment to help you modernise your home, we will explain the full range of options so you can make an informed decision as to what works best for you.

To discuss your home renovation project with a Clifton Private Finance specialist, book a free consultation today.