London Renovation Cost Estimator 2026 — Free Kitchen, Bathroom & Extension Price Guide | South London
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London renovation cost estimator 2026 — use our free interactive tool above to model your project in seconds, then book a free on-site survey across South London. LMDEC LTD is a Polish family-run building company specialising in home extensions and loft conversions, premium kitchens, luxury bathrooms, Victorian restoration and complete refurbishments.
London renovation cost estimator — 2026 price guide
London renovation costs in 2026 typically run 25–40% above the UK national average because of higher labour rates, parking and skip permits, period property surprises, and borough planning rules. For South London Victorian terraces and Edwardian semis, most homeowners budget using a cost-per-square-metre model — exactly what our London renovation cost estimator uses.
As a rough market guide (VAT-inclusive, labour + materials, before architect fees):
| Project type | Typical South London range | What drives the price |
|---|---|---|
| Kitchen renovation | £18,000 – £55,000+ | Layout changes, steel openings, appliances, stone worktops, plumbing & electrics |
| Bathroom / en-suite | £7,000 – £26,000 per room | Tiling, waterproofing, underfloor heating, premium sanitaryware |
| Rear / side extension | £60,000 – £180,000+ | Foundations, steel, roof, bi-fold doors, Building Control, finishes |
| Loft conversion | £60,000 – £120,000+ | Dormer vs mansard, staircase, insulation, fire escape routes, ensuite |
| Victorian restoration | £80,000 – £200,000+ | Lime render, brick repair, sash windows, damp & heritage compliance |
| Full house refurbishment | £120,000 – £250,000+ | Rewire, replumb, multiple wet rooms, structural openings, decoration |
Figures are indicative for 2026 South London market conditions. Your London renovation cost estimator result is a planning range — a physical survey confirms scope, structure and fixed pricing.
Kitchen renovation cost in South London
Kitchen projects are the most searched renovation query in London. Homeowners in Wandsworth, Clapham, Balham, Wimbledon, Richmond and Dulwich typically want open-plan layouts, structural steel, quartz or stone worktops, and integrated appliances.
- Standard Comfort: quality modern finishes, practical layout — from around £12,000–£28,000 depending on size.
- Premium Heritage: bespoke joinery, heritage-matched details — £28,000–£45,000.
- Bespoke Architectural: Crittall glazing, micro-cement, luxury custom cabinetry — £45,000+.
Opening a Victorian galley kitchen into the rear reception usually adds £2,000–£5,000 for structural steel and Building Regulations sign-off — use the London renovation cost estimator above to include approximate floor area and specification grade.
Bathroom renovation cost in South London
Bathrooms have the highest cost per square metre of any room. En-suites, wet rooms and family bathrooms in SW and TW postcodes commonly range from £7,000 (compact refresh) to £26,000+ (luxury ensuite). Key cost drivers include concealed pipework in period properties, tanking, tiling labour, heated floors and premium brassware.
Loft conversion & extension costs — SW, TW & SE London
Loft conversions and rear extensions remain the highest-ROI structural upgrades in South London. Most dormer lofts add 20–30 m² and take 8–14 weeks on site. Single-storey rear extensions often fall under permitted development rules in England (subject to neighbour consultation and borough rules), while double-storey and wrap-around schemes usually need full planning permission.
For independent UK cost benchmarks, see the Checkatrade kitchen renovation cost guide. LMDEC handles structural steel, brickwork, roofing and Building Control in-house — so your estimate includes the trades that most quotes split across multiple subcontractors.
Areas we cover
Our valuation surveys and building teams operate across South London boroughs including Wandsworth, Lambeth, Richmond upon Thames, Merton, Croydon, Southwark, Lewisham, Kingston and surrounding areas — SW, TW, SE, CR and SM postcodes. We are experienced with Victorian terraces, Edwardian semis, conservation-area constraints and party wall projects.
What affects your final quote?
- Property age & condition — damp, asbestos, rotten timbers and outdated wiring add 10–20% contingency on period homes.
- Specification grade — materials and craftsmanship tier (Standard, Premium Heritage, Bespoke).
- Planning & Party Wall — agreements, structural engineer drawings and council fees.
- Access & logistics — scaffolding, skip permits and parking in controlled zones.
- Whether architectural drawings exist — projects with approved plans typically move faster and cost less at survey stage.
Why use LMDEC’s London renovation cost estimator?
Most London homeowners request three to five quotes without a budget framework — which wastes time and attracts incompatible proposals. Our London renovation cost estimator lets you:
- Compare Standard vs Premium vs Bespoke pricing instantly
- Adjust floor area (m²) to match your layout
- Transfer settings into our free valuation booking form in one click
- Receive a documented estimate range before a site visit
LMDEC LTD carries £2M Public Liability Insurance. Gas and electrical certification is completed by qualified registered subcontractors with certificates issued on completion.
London renovation cost estimator — FAQ
How accurate is an online renovation cost calculator?
Online calculators are best for early budgeting and scope planning. They use regional cost indices and typical build rates — not a substitute for a site survey. LMDEC’s London renovation cost estimator is calibrated for South London residential work; your free survey converts the range into a fixed, itemised quote.
How much does a kitchen renovation cost in London in 2026?
Most London kitchen renovations in 2026 fall between £18,000 and £55,000, depending on size, structural changes and appliance specification. South London period properties often require additional electrical and plumbing work.
How much does a bathroom renovation cost in London?
Expect £7,000–£14,000 for a standard family bathroom, £14,000–£20,000 for a mid-range walk-in shower ensuite, and £20,000+ for luxury designer bathrooms in SW London.
How much does a loft conversion cost in South London?
A typical dormer loft conversion in South London costs £60,000–£120,000 in 2026, including structure, staircase, insulation, electrics, plastering and finishes. Mansard and hip-to-gable conversions sit at the higher end.
Do I need planning permission for an extension in South London?
Many single-storey rear extensions qualify as permitted development, but conservation areas, Article 4 directions and larger footprints require planning permission. LMDEC checks feasibility during your free site visit.
Is a free site survey really free?
Yes. LMDEC offers complimentary on-site valuation surveys for homeowners planning extensions, lofts, kitchens, bathrooms or full refurbishments in South London. Book via the form above or call 07472 883 901 / 020 4577 2001.
Get a fixed quote after your estimate
Ready to move from calculator to contract? Request a free quote, email info@lmdec.co.uk, or use the booking form built into this page. We respond within 48 hours with feasibility notes and next steps.