This is the definitive reference guide for UK renovation costs in 2025 — covering every major project from a bathroom refit to a full house renovation, with realistic price ranges, regional variation notes, and the key factors that push costs up or down. Bookmark it, share it, and use it before you speak to a single contractor.
All figures include labour and materials. They reflect 2025 market conditions across England and Wales. See the regional variation section for adjustments.
Master Cost Table: Every Major Renovation Project
| Project | Low | High | Notes |
|---|---|---|---|
| Full house renovation (3-bed terrace) | £50,000 | £120,000+ | Scope-dependent; see breakdown below |
| Kitchen extension (single storey rear) | £30,000 | £60,000 | Excludes kitchen refit; structure + finishes only |
| Loft conversion (dormer) | £35,000 | £60,000 | Includes staircase, electrics, plastering |
| Loft conversion (Velux only) | £20,000 | £35,000 | No dormer; all within existing roof plane |
| Garage conversion (attached, to habitable space) | £10,000 | £20,000 | Includes insulation, electrics, plastering |
| Bathroom renovation (full refit) | £5,000 | £15,000 | Includes sanitaryware, tiling, plumbing |
| Kitchen renovation (refit, no extension) | £8,000 | £25,000 | Includes units, worktop, appliances, flooring |
| Boiler replacement | £2,000 | £4,000 | Gas boiler, standard system; combi-combi swap |
| Full rewire (3-bed semi) | £4,000 | £10,000 | Includes consumer unit, all circuits |
| Central heating installation (no existing system) | £3,000 | £7,000 | Boiler, radiators, pipework, controls |
| New roof (3-bed semi) | £5,000 | £12,000 | Full strip and re-roof; felt, battens, tiles |
| Garden room / home office | £10,000 | £30,000 | Mid-spec insulated build; not bespoke |
| Damp proof course (DPC injection) | £800 | £3,000 | Typically 2–3 walls; includes replastering zone |
| Cavity wall insulation | £500 | £1,500 | Blown bead or mineral wool; standard 3-bed semi |
| Solid wall insulation (external) | £8,000 | £25,000 | EWI system; 3-bed semi; includes render finish |
| Loft insulation (top-up to 270mm) | £300 | £600 | Standard 3-bed accessible loft |
| Solar panels (4kWp system) | £5,000 | £9,000 | 10–12 panels; grid-connected; excludes battery |
| Heat pump (ASHP, inc. BUS grant) | £7,000 | £15,000 | Net of £7,500 Boiler Upgrade Scheme grant |
Full House Renovation: What's Included at Each Price Point
A "full house renovation" on a 3-bed terrace can mean very different things. Here is what you typically get at each budget level:
Light Renovation: £25,000–£50,000
- New kitchen units and worktop
- Bathroom refit
- Full redecoration (all rooms)
- New flooring throughout
- Boiler replacement
- Basic electrical updates (consumer unit, sockets)
Mid-Range Renovation: £50,000–£80,000
- All of the above, plus:
- Full rewire
- New central heating system
- Some structural alterations (knocked-through ground floor)
- Rear extension preparation or loft preparation (but not complete conversion)
- New windows and doors
Comprehensive Renovation: £80,000–£120,000+
- All of the above, plus:
- Loft conversion or full rear extension
- Full replastering throughout
- Underfloor heating on ground floor
- High-specification kitchen (£15,000+ kitchen budget)
- Full bathroom and en suite
- Landscaping and external works
Cost Per Square Metre Benchmarks
These are industry benchmarks for budgeting before detailed quotes are obtained. They cover internal fit-out or new-build extension work.
| Type of Work | Cost per m² (2025) |
|---|---|
| Internal fit-out (standard) | £600–£900/m² |
| Internal fit-out (high specification) | £900–£1,200/m² |
| Single-storey extension (structure + fit-out) | £1,500–£2,000/m² |
| Double-storey extension | £1,800–£2,500/m² |
| Loft conversion (habitable space added) | £1,500–£2,200/m² |
| New-build equivalent (for context) | £2,000–£3,500/m² |
Example: A 20m² kitchen extension at £1,750/m² = £35,000. This is a useful cross-check against contractor quotes — anything well below benchmark warrants scrutiny of what is excluded.
Regional Cost Variation
Labour costs in the UK vary significantly by geography. The figures in the master table above reflect a national average. Apply these regional adjustments:
| Region | Adjustment vs National Average |
|---|---|
| Greater London | +25–40% |
| South East (Home Counties, Surrey, Herts) | +20–30% |
| South West (excl. rural) | +5–15% |
| East of England | +10–20% |
| East Midlands | Benchmark (0%) |
| West Midlands | 0 to +5% |
| Yorkshire and the Humber | -5 to 0% |
| North West | -5 to +5% |
| North East | -10 to -5% |
| Wales | -5 to 0% |
| Scotland | 0 to +10% (particularly Edinburgh and Aberdeen) |
Example: A dormer loft conversion quoted at £45,000 in the East Midlands would be £54,000–£58,500 equivalent in the Home Counties. Regional variation is the single most common reason homeowners are surprised by quotes — do not use London-based cost estimates when budgeting for a Midlands project, or vice versa.
Labour vs Materials: Typical Split
Understanding the labour/materials split helps you assess quotes and understand where costs go when prices rise.
| Project Type | Labour % | Materials % |
|---|---|---|
| Extension (structure) | 55–65% | 35–45% |
| Kitchen refit | 40–50% | 50–60% |
| Bathroom refit | 50–60% | 40–50% |
| Full rewire | 65–75% | 25–35% |
| Plastering | 70–80% | 20–30% |
| Roofing | 40–50% | 50–60% |
| Insulation (loft/cavity) | 50–60% | 40–50% |
Implication: In labour-heavy projects (rewiring, plastering), the regional labour premium has a proportionally larger impact. In materials-heavy projects (roofing, kitchen units), specification choices — tile brand, appliance grade, worktop material — drive cost variation more than geography.
How to Budget Correctly
Step 1: Write a Schedule of Works
A Schedule of Works is a line-by-line list of every item to be done, by trade, with a specification. It is the document against which contractors quote. Without it, quotes are not comparable and scope creep is inevitable.
A basic schedule of works for a bathroom refit might include:
- Strip out existing sanitaryware and tiles
- Tanking of wet area (specify product)
- Supply and install bath (specify brand and model), bath screen, bath/shower valve
- Supply and install WC (specify brand and model)
- Supply and install basin and vanity unit (specify)
- Tiling — floor (specify tile size and brand) and walls (specify)
- Supply and install towel rail (specify)
- Plumbing connections (first and second fix)
- Electrical connections — extractor fan, shaver socket, mirror light (if applicable)
- Decoration — mist coat and two finish coats
Without this level of specification, one contractor's quote may include mid-range sanitaryware and another may assume budget-range — creating a false price comparison.
Step 2: Get Three Quotes Minimum
For any project over £5,000, get a minimum of three quotes. For projects over £20,000, consider using a quantity surveyor to cost the schedule of works independently before tendering.
Step 3: Apply a 15–20% Contingency
This is not optional. UK construction professionals universally apply a minimum 10% contingency; 15–20% is standard for renovation projects where unknown conditions exist (older properties, structural work, opening up walls).
Step 4: Separate Fixed Costs from Variable Costs
- Fixed costs: Labour, scaffolding, skip hire, building control fees, structural engineer — price these as fixed items in your budget
- Variable costs: Kitchen units, bathroom sanitaryware, flooring, tiles — these are specification-driven and you can adjust them without affecting the structural cost
What Drives Renovation Costs Higher
Listed Buildings
Any works to a listed building (Grade I, II*, or II) require Listed Building Consent in addition to planning permission and building regulations. Materials must match existing fabric in type and appearance — modern alternatives are often refused. Specialist contractors charge premium rates. Budget 30–50% more than equivalent unlisted property works.
Underpinning
If structural investigation reveals inadequate or failed foundations, underpinning may be required. Traditional mass concrete underpinning costs £10,000–£20,000 for a typical terraced house. Mini-piled underpinning (often used where traditional access is restricted) costs £15,000–£30,000+. Underpinning also affects insurance and mortgage lending.
If you are converting or excavating a basement, underpinning is only one part of the cost picture. Our basement conversion costs and planning guide covers the full cost breakdown — from tanking an existing cellar (£8,000–£20,000) through full new excavation (£100,000–£150,000+) — along with when planning permission is required and the Party Wall Act obligations that apply to most terraced and semi-detached properties.
Site Access
Restricted access significantly increases costs. If a skip or materials lorry cannot access the site, manual handling to and from a public road multiplies labour time. Properties with no side access, properties in pedestrianised streets, or first/second floor flats all carry an access premium.
Asbestos
Pre-1985 properties may contain asbestos in:
- Artex textured coatings on walls and ceilings
- Floor tiles and adhesives (particularly vinyl or thermoplastic tiles)
- Pipe insulation
- Roofing and soffit panels (asbestos cement)
If asbestos is found during renovation, work must stop. A licensed contractor must carry out removal or encapsulation. Asbestos survey: £200–£400. Removal of a single room of Artex: £800–£2,500. Removal of pipe insulation: £1,000–£5,000+.
Party Wall Agreements
Works on a shared (party) wall require a Party Wall Award — a legal agreement with the adjoining owner(s). If neighbours appoint their own surveyor, you pay both surveyors' fees: budget £1,500–£3,000+ for a contested party wall matter.
Renewable Energy and Low-Carbon Projects
These projects are increasingly funded by government grants and are cost-effective over a 10–15 year horizon.
Solar Panels (4kWp)
- Cost: £5,000–£9,000 installed
- Annual generation: ~3,400 kWh in the South East; ~2,800 kWh in Scotland
- Export tariff (SEG): Up to 15p/kWh for exported electricity
- Payback: 8–12 years; longer with battery storage added
Air Source Heat Pump (ASHP)
- Cost before grant: £14,500–£22,500
- Boiler Upgrade Scheme (BUS) grant: £7,500 (as at 2025)
- Cost net of grant: £7,000–£15,000
- Running cost vs gas: Lower per unit of heat produced (COP 2.5–3.5); higher if property is poorly insulated
- Best suited to: Well-insulated properties; low-temperature underfloor heating systems
Getting Quotes: A Checklist
Before requesting quotes from contractors:
- Schedule of Works written and specification agreed
- Architect or structural engineer drawings produced (if applicable)
- Building regulations application submitted (Full Plans route — inspectors check compliance before work starts)
- Party Wall Notices served (if applicable)
- Planning permission confirmed (if applicable)
- Budget envelope set including 15–20% contingency
- Payment milestone schedule drafted (never pay more than 30% upfront)
- References checked for each contractor
- Insurance confirmed (contractor's public liability, minimum £2m)
Final Word: Use This Guide as a Starting Point
Cost guides give you a defensible range before you speak to anyone. Use the figures here to:
- Identify projects you can afford at your budget
- Sense-check contractor quotes before accepting them
- Prioritise works into phases when the full scope exceeds your current budget
- Build a realistic business case for a property purchase or remortgage
Costs change with material prices, regional demand, and project complexity. Always get a written, itemised quote before committing to any project — and never proceed on a verbal estimate alone.
Further Reading
- How to Read an EPC Certificate: What Every Rating and Number Means
- Retrofit vs New Build: Energy Efficiency Compared UK
- How to Manage a Renovation While Living in the Property — room sequencing, dust containment, temporary kitchen setup, and the real cost of staying elsewhere
- Renovation Grants and Funding UK 2025 — GBIS, ECO4, Boiler Upgrade Scheme, Warm Homes Local Grant, and Disabled Facilities Grant explained
- How to Find and Vet a Roofing Contractor UK — NFRC and TrustMark checks, red flags, and a full cost table for every type of roofing work
- Party Wall Surveyor Costs UK — scenario cost table from simple loft conversions to complex basement digs, and who pays under the Act
- How to Add Value to a Period Property UK — the character premium, highest-ROI improvements, and what not to do on a pre-1919 home
- What Is a Sinking Fund in a Leasehold Property? — contribution ranges by block size, what to do when the fund is empty at exchange
- VAT on Renovation Work UK — When You Pay 5% and When You Pay 20% — before you budget, know which rate applies to your project: 20% standard, 5% reduced, or zero
- Renovation Cost Contingency: How Much to Budget and Why — once you have your baseline costs from this guide, here's how to size the contingency fund on top
- When to Use a Project Manager vs Manage Your Own Renovation — factor in the 10–15% PM fee when building your overall project budget
This is post 100 on the Renovate Me blog — a milestone for us and, we hope, a genuinely useful reference for every homeowner, buyer, and investor who finds it. If you're ready to turn these numbers into a personalised renovation roadmap, Renovate Me will walk you through every stage.