Building cost in Hackney: 2026 rates.
Hackney's Victorian terrace and ex-warehouse stock makes it one of the more cost-efficient inner-London boroughs for homeowner extensions: rear extensions £2,800–£3,900/m², lofts £65k–£125k, refurbs £2,300–£3,400/m² on 2026 rates. Conservation areas in Stoke Newington, De Beauvoir and Dalston tighten material specs, but contractor competition is strong and quote spreads of 15–25% are normal.
| Project type | Typical 2026 cost |
|---|---|
| Rear extension | £2,800–£3,900/m² |
| Loft conversion (total) | £65,000–£125,000 |
| Full refurbishment | £2,300–£3,400/m² |
| Basement (per m²) | £4,800–£7,400/m² |
All figures exclude VAT (20% on most refurb/extension work), professional fees (8–14% typical), party wall awards and statutory costs.
- Hackney's Basement Development SPD restricts excavation under gardens
- Stoke Newington, De Beauvoir, Mapledene and Dalston conservation areas remove key PD rights
- Side-return + rear extensions ('wrap-around') dominate the borough's kitchen renovation market
- Party Wall awards typically £900–£2,400 per adjoining owner on terrace work
- Quote spreads of 15–25% on the same scope mean quote review almost always pays for itself
Strong contractor competition and tight prelims discipline are the key levers, quote review almost always recovers more than the cost expert fee.
Frequently asked, Hackney
How much does a wrap-around extension cost in Hackney?
A typical 25–35m² wrap-around (side return + rear) on a Hackney Victorian terrace costs £110,000–£170,000 on 2026 rates, plus VAT, design and statutory costs. Crittall-style glazing, large openings and tiled roofs all sit at the top of that band.
Are Hackney builder quotes generally reliable?
Hackney has a deep contractor market, so quote competition is healthy, but the spread between honest mid-range quotes and inflated outliers regularly hits 20–30%. An independent quote review identifies missing scope and prelims inflation before you appoint.
Do I need a Party Wall surveyor in Hackney?
If you are excavating within 3m of a neighbour, building on the boundary, or cutting into a party wall, the Party Wall Act 1996 applies. Hackney's dense terrace stock means most rear extensions and loft conversions trigger awards on at least one boundary.
Know what your project should cost. Before you build it.
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