Building cost in Haringey: 2026 rates.
Haringey's mix of Edwardian semis (Muswell Hill, Crouch End), Victorian terraces (Stroud Green, Harringay) and ex-council stock produces a cost range of £2,700–£3,800/m² on rear extensions, £62k–£125k on lofts and £2,200–£3,400/m² on full refurbs on 2026 rates. PD rights are intact on most non-Article-4 streets, keeping design fees lower than central boroughs.
| Project type | Typical 2026 cost |
|---|---|
| Rear extension | £2,700–£3,800/m² |
| Loft conversion (total) | £62,000–£125,000 |
| Full refurbishment | £2,200–£3,400/m² |
| Basement (per m²) | £4,500–£7,200/m² |
All figures exclude VAT (20% on most refurb/extension work), professional fees (8–14% typical), party wall awards and statutory costs.
- Highgate, Muswell Hill, Crouch End and Bruce Castle conservation areas remove key PD rights
- Edwardian semi stock supports large hip-to-gable + rear-dormer lofts on the same project
- Side-return + rear wrap-arounds dominate the kitchen extension market in N8 and N4
- Haringey's basement SPD restricts excavation under listed buildings
- Party Wall Act 1996 awards typically £900–£2,300 per adjoining owner
Haringey's contractor market is competitive, quote comparison reliably saves 10–18% on shortlisted quotes.
Frequently asked, Haringey
How much is a Crouch End rear extension?
A typical 20–28m² rear extension on a Crouch End Edwardian semi costs £80,000–£140,000 on 2026 rates, plus VAT, design and statutory costs. Sliding glazing, in-frame kitchens and roof lantern specifications drive the upper end of the band.
Can I build a loft conversion under PD in Haringey?
On non-Article-4 streets, rear-dormer loft conversions on terraces and semis can usually go under permitted development subject to volume limits (40m³ terrace, 50m³ semi/detached). Hip-to-gable plus rear-dormer often exceeds PD volumes and needs full planning.
What does a Muswell Hill refurbishment cost?
A full strip-and-reinstate refurb of a 150–200m² Muswell Hill Edwardian semi costs £400,000–£700,000 on 2026 rates, plus VAT, design and statutory costs. Heritage-grade timber windows and conservation roofing add 8–12% versus non-conservation comparables.
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