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2026 pricing

Londonconstructioncostguides.

Real cost ranges from 200+ completed projects. No glossy marketing numbers — actual delivered costs, broken down by configuration, finish and London zone.

Cost guide

Loft Conversion Cost in London 2026

Comprehensive 2026 pricing for every type of London loft conversion. Real costs from 200+ completed projects, broken down by configuration, finish spec and zone.

Range
£45,000–£145,000+
Per m²
£2,200–£3,400

Cost guide

House Extension Cost in London 2026

Single-storey, double-storey, side return and wraparound — full 2026 cost guide for London house extensions based on completed projects across all 33 boroughs.

Range
£50,000–£220,000+
Per m²
£2,800–£4,200

Cost guide

Kitchen Extension Cost in London 2026

Detailed pricing for London open-plan kitchen extensions: side return, rear, wraparound. Real-world cost ranges, factor analysis and worked examples.

Range
£55,000–£180,000+
Per m²
£3,200–£4,800

Cost guide

House Renovation Cost in London 2026

End-to-end whole-house renovation pricing for London Victorian, Edwardian, Georgian and modern homes. Cost-per-m², factor analysis, worked examples per finish tier.

Range
£80,000–£600,000+
Per m²
£1,800–£6,000

Cost guide

Loft Conversion Cost North London 2026

Real 2026 loft conversion pricing for North London boroughs — Barnet, Enfield, Haringey, Camden, Islington, Waltham Forest. Edwardian and Victorian stock, conservation overlays, and the realistic costs of going up.

Range
£48,000–£140,000+
Per m²
£2,250–£3,350

Cost guide

Loft Conversion Cost South London 2026

2026 loft conversion pricing for South London boroughs — Lambeth, Lewisham, Southwark, Croydon, Bromley, Merton, Wandsworth. Victorian and Edwardian terrace stock dominates; mansards lead the market.

Range
£46,000–£135,000+
Per m²
£2,200–£3,300

Cost guide

Loft Conversion Cost East London 2026

2026 loft conversion pricing for East London boroughs — Hackney, Tower Hamlets, Newham, Waltham Forest, Redbridge, Barking & Dagenham. Victorian terraces, post-war stock, and the fastest-growing inner London market.

Range
£44,000–£130,000+
Per m²
£2,150–£3,250

Cost guide

Loft Conversion Cost West London 2026

2026 loft conversion pricing for West London boroughs — Ealing, Hounslow, Hammersmith & Fulham, Brent, Harrow, Richmond, Kensington & Chelsea. Edwardian semis, prime conservation overlays, and the most expensive prime postcodes in the city.

Range
£50,000–£160,000+
Per m²
£2,400–£3,600

Cost guide

House Extension Cost North London 2026

2026 house extension pricing for North London — Camden, Islington, Haringey, Barnet, Enfield, Waltham Forest. Edwardian and Victorian terrace cluster, plus the suburban 1930s semis of outer Barnet and Enfield.

Range
£55,000–£230,000+
Per m²
£2,900–£4,400

Cost guide

House Extension Cost South London 2026

2026 house extension pricing for South London — Lambeth, Lewisham, Southwark, Croydon, Bromley, Merton, Wandsworth, Greenwich. Victorian terrace density inner, suburban semi stock outer.

Range
£52,000–£215,000+
Per m²
£2,800–£4,300

Cost guide

House Extension Cost East London 2026

2026 house extension pricing for East London — Hackney, Tower Hamlets, Newham, Waltham Forest, Redbridge, Barking & Dagenham. Victorian terrace cluster inner, suburban semi stock outer, and the fastest-rising property values in the city.

Range
£50,000–£210,000+
Per m²
£2,750–£4,200

Cost guide

House Extension Cost West London 2026

2026 house extension pricing for West London — Ealing, Hounslow, Hammersmith & Fulham, Brent, Harrow, Richmond, Kensington & Chelsea. Edwardian semis, Victorian terraces, and the most expensive postcodes in the city.

Range
£58,000–£260,000+
Per m²
£3,100–£4,800

Cost guide

Basement Conversion Cost in London 2026

Comprehensive 2026 pricing for every type of London basement conversion — cellar refurbishment, full basement excavation and basement extension. Real costs from completed projects, broken down by depth, footprint and zone.

Range
£35,000–£500,000+
Per m²
£3,500–£7,500

Cost guide

Garden Office Cost in London 2026

Real 2025–2026 pricing for London garden offices: compact timber studios to large architect-designed workspace buildings. Costs include foundation, insulation, electrics, joinery and decoration — no provisional sums.

Range
£20,000–£75,000+
Per m²
£1,800–£2,800

Cost guide

Conservatory & Orangery Cost in London 2026

Complete 2026 pricing guide for conservatories and orangeries in London. Real cost ranges from completed projects across all 32 boroughs, broken down by structure type, glazing specification, planning route and zone.

Range
£35,000–£120,000+
Per m²
£1,900–£3,200

Cost guide

Garage Conversion Cost in London 2026

Full 2026 pricing for every type of London garage conversion — integral, single, double and tandem. Real costs from completed projects, broken down by configuration, finish spec and London zone.

Range
£18,000–£70,000+
Per m²
£900–£1,800

Cost guide

Landscaping Cost in London 2026

Comprehensive 2026 pricing for garden landscaping in London. Real costs from completed projects across all 32 boroughs, broken down by project type, material specification and garden size.

Range
£8,000–£80,000+
Per m²
£80–£350

Related reading

Insights and planning guides.

Market analysis

How much value does a loft conversion add to a London home in 2026?

Land Registry data analysis of 1,200 London terrace sales: what a dormer, L-shape and mansard loft conversion actually adds to property value across zones 2–6.

9 min read →

Planning

Permitted Development changes affecting London homes in 2026

What the 2025 GPDO amendments mean for London extensions and loft conversions in 2026 — practical implications for homeowners planning work now.

7 min read →

Sustainability

Heat pumps in London extensions: when they make sense and when they don't

Air source heat pumps are now standard spec on new builds and most extensions, but the economics depend on building fabric, hot water demand and noise constraints. Practical guidance from 30 installs.

8 min read →

planning

Permitted Development in London: The 2026 Guide

Most loft conversions and rear extensions in London proceed under permitted development — no planning application required. This is what permitted development means in 2026, what it covers, and where it doesn't apply.

Read guide →

planning

Building in a London Conservation Area: What You Can and Can't Do

Conservation areas cover roughly 25% of London. They preserve the architectural and historic character of an area through additional planning controls. This is what those controls mean for extensions, lofts and renovations.

Read guide →

regulations

The Party Wall Act in London: A Plain-English Guide

Most London extensions and many loft conversions involve work to a party wall — the wall between you and a neighbour. The Party Wall etc. Act 1996 governs how those works are managed. Here's what it actually means.

Read guide →

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