Oak Frame Extension Cost UK 2026

Oak frame extensions combine a traditional timber-frame structure with large glazing — a popular choice in the South West and South East. In 2026, expect £2,800–£4,000 per m² — premium pricing for the bespoke timber.

Quick answer

Typical UK price range: £50,000–£180,000. Typical time: 12–20 weeks.

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Extension type Single-storey rear Double-storey Side return Wrap-around Kitchen extension Oak frame

Extension floor area (m²)

Region London South East South West Midlands North of England Scotland Wales Northern Ireland

Specification level Basic / standard Mid-range Premium / high-end

Extras

Bi-fold doors £2,500–£6,000 Roof lanterns £1,500–£3,500 Underfloor heating £2,500–£5,000 New kitchen fit £8,000–£25,000 Architect & plans £2,500–£5,000

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Estimate only. Prices reflect 2026 UK market data — get quotes from local tradespeople for accurate pricing.

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Budget Under £5,000 £5,000 – £15,000 £15,000 – £30,000 £30,000 – £60,000 £60,000+ Not sure

Timeline As soon as possible 1 – 3 months 3 – 6 months 6+ months Just researching

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Key points

• £2,800–£4,000/m² — 30–50 % more than brick
• Often needs planning permission unless rural
• Drying time means longer project (12–20 weeks)
• Bespoke look — adds strong character premium

Cost breakdown

Item	Low	High
Foundations + slab	£6,000	£12,000
Oak frame structure	£20,000	£55,000
Glazing (huge windows typical)	£8,000	£25,000
Roof + finishes	£6,000	£14,000
Internal fit-out	£6,000	£14,000
Architect + planning	£4,000	£9,000

Cost by UK region

Region	Typical cost
London	£155,250
South East	£143,750
South West	£126,500
Midlands	£115,000
North England	£103,500
Scotland	£109,250
Wales	£103,500

How to save money

• Use a specialist oak frame supplier (Border Oak, Carpenter Oak)
• Allow oak to settle — never plaster directly to the frame
• Choose triple-glazing for thermal comfort with large openings

How to find a trusted tradesperson

Get at least 3 quotes from vetted UK trade networks:

• Checkatrade
• MyBuilder
• Bark

FAQs

Does oak shrink?

Yes — green oak loses 6–8 % of its volume over the first 5 years. Specialist builders design around this.

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Disclaimer: Prices are guide ranges based on 2026 UK market data. Get quotes from local tradespeople for accurate pricing.