Is a Home Extension Cheaper Than Moving House in 2026?
Moving to a larger home costs an upsizer roughly £28,000 in stamp duty, fees and removals — money that buys no extra space. A rear extension costs £45,000–£65,000 but becomes equity in your home. Here is the honest 2026 comparison, plus 3 free quotes.
Extend or move — the 2026 verdict
If you like where you live, extending is usually the cheaper way to gain space.
- Cost to move (typical upsizer): ~£28,000 in non-recoverable fees
- Single-storey rear extension: £45,000 – £65,000
- Value an extension typically adds: 10–15%
- Moving wins when: you need a different location or plot
Moving costs vanish into stamp duty and fees; extension spend becomes equity. Net of the value added, an extension is often the lower true cost.
Moving vs extending: a 2026 cost comparison
Based on a typical upsizer selling a £400,000 home and buying a £550,000 one, versus adding a 25m² rear extension to the existing home.
| Cost of Moving | 2026 Estimate |
|---|---|
| Stamp duty (on £550,000 purchase) | £17,500 |
| Estate agent fee (~1.2% + VAT on £400,000) | £5,760 |
| Conveyancing (buy + sell) | £3,000 |
| Removals | £1,200 |
| Mortgage & valuation fees | £800 |
| Total non-recoverable cost | ~£28,000 |
By contrast, a £45,000–£65,000 rear extension is largely recovered in added value. Stamp duty bands used: 0% to £125k, 2% to £250k, 5% to £925k (HMRC 2026). Your figures will vary by region and property value.
4 factors that decide extend vs move
Do you love your area?
If schools, commute and neighbours already suit you, extending keeps all of that and avoids £28,000 of moving friction. If you need a different location, moving is the only real option.
Street value limit
If your home is near the top price for the street, an extension may not return its cost. Where there is headroom, the value uplift can offset most of the spend.
How much & what type
An extra reception room or bigger kitchen suits extending. A fundamentally larger house, more bedrooms and a bigger plot can be cheaper to buy than to build.
Time & tolerance
An extension means 3–4 months of building work while you live in the house. Moving is faster to gain space but front-loads the cost in fees you never see again.
More 2026 Extension Insights
All insights →Rear Extension Cost 2026
Full rear extension price breakdown for 2026.
Is an Extension Worth It?
Whether a home extension pays off in 2026.
UK Extension Cost Guide
Every extension type compared with a calculator.
Loft vs Extension 2026
Which adds space more cheaply — loft or extension?
Compare Extension Quotes Before You Decide
BestBuilders matches you with up to 3 vetted UK extension builders. Comparing real quotes against the full cost of moving is the only way to know which is cheaper — all for free.