Extension Builder Cost in Lewisham

Extension building costs in Lewisham vary significantly depending on the size, style, materials, and complexity of your project. As part of Greater London, labour rates and material costs are typically 25–35% higher than the national average. Planning permission, building regulation approval, and site conditions all influence the final price. BizHub365 connects Lewisham homeowners with experienced local extension builders who provide transparent quotes and deliver quality results on time and within budget.

Extension Builder Prices in Lewisham

Service	Typical Cost	Unit
Single-storey rear extension (3×4m)	£15000 – £28000	per job
Single-storey rear extension (4×6m)	£25000 – £45000	per job
Two-storey extension (3×4m per floor)	£35000 – £65000	per job
Conservatory (3×4m)	£12000 – £22000	per job
Extension project management & site supervision	£45 – £75	per hour
Planning permission application support	£400 – £800	per application
Building regulation approval & compliance inspection	£600 – £1200	per project
Structural engineer survey & design	£500 – £1000	per survey

Prices are indicative averages for Lewisham. Actual quotes will vary based on job specifics.

What Affects the Cost?

Extension costs in Lewisham are driven by several key factors: build size and complexity, choice of materials (brick, render, timber cladding), roof type, and whether existing walls require structural modification. Ground conditions, access difficulties, and proximity to party walls add cost. Planning permission and building regulation requirements vary by location within Lewisham. Labour availability and material supply chains in Greater London also push prices higher than regional averages. Specialist trades like structural engineers and electricians may add 15–20% to project costs.

Money-Saving Tips

Obtain multiple quotes from established Lewisham extension builders before committing. Plan your extension during quieter seasons (late autumn/winter) when tradespeople may offer better rates. Clarify what's included in quotes—materials, labour, VAT, and contingency—to avoid hidden costs. Pre-approve planning and building control early to prevent costly delays.

Frequently Asked Questions

Do I need planning permission for an extension in Lewisham?

Most single-storey rear extensions under 4m in depth and meeting size/style criteria are permitted development. Two-storey extensions, larger builds, and those affecting neighbours typically require planning permission from Lewisham Council. Always check with your local planning authority first—costs to obtain permission range £400–£800.

How long does a typical extension project take in Lewisham?

A single-storey extension usually takes 8–14 weeks, whilst two-storey builds take 4–6 months. Weather, planning delays, and ground conditions in Lewisham can extend timelines. Agree a realistic schedule with your builder upfront and clarify penalty clauses for overruns.

What's included in an extension builder's quote?

Professional quotes should detail labour, materials, VAT, structural works, electrics, plumbing, and contingency (typically 5–10%). Clarify whether planning support, building control inspections, and specialist fees (engineer, architect) are included or charged separately. Hidden costs often emerge without clear written terms.

Why do Lewisham extension costs differ from national averages?

Greater London pricing reflects higher labour rates (£45–£75/hour vs. £35–£50 regionally), premium material costs, and greater demand for tradespeople. Lewisham's varied housing stock and party wall considerations also increase complexity and cost compared to rural or suburban areas.

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