Which postcode districts around Haringey do we cover for basement extension work?
Every Haringey postcode district we draw in, the stock that dominates
it and the authority that validates a basement extension there. Haringey fees below are the
statutory England rates for 2026, not basement extension estimates.
| Postcode | Area | Dominant stock | What it means for a basement extension |
|---|
| N4 | Finsbury Park / Stroud Green | Victorian terraces, post-war estates | Finsbury Park / Stroud Green is split at N4. Either Haringey Council or Islington Council or Hackney Council can determine a basement extension here, so the N4 address is checked against both policies maps first. |
| N8 | Crouch End / Hornsey | Edwardian terraces, Victorian villas | A basement extension at an N8 address in Crouch End / Hornsey is determined by Haringey Council under its own Local Plan policies for Crouch End / Hornsey. |
| N10 | Muswell Hill | Edwardian villas, 1930s semi-detached | N10 straddles a boundary: Muswell Hill addresses fall to Haringey Council or Barnet Council, so confirm which authority validates the basement extension before submitting N10 drawings. |
| N15 | Seven Sisters / South Tottenham | Victorian terraces, post-war estates | Seven Sisters / South Tottenham sits wholly inside N15, so Haringey Council validates every basement extension submitted from an N15 address. |
| N17 | Tottenham | Victorian terraces, post-war estates | Tottenham sits wholly inside N17, so Haringey Council validates every basement extension submitted from an N17 address. |
| N22 | Wood Green / Alexandra Palace | Edwardian terraces, post-war flats | N22 covers Wood Green / Alexandra Palace only; Haringey Council handles the basement extension. |
| N6 | Highgate | Georgian villas, Victorian and Edwardian semis | Highgate is split at N6. Either Camden Council or Haringey Council can determine a basement extension here, so the N6 address is checked against both policies maps first. |
Which Haringey neighbourhoods suit a basement extension best?
Roof pitch, wall build-up and plot depth change every few Haringey
streets, and each one changes what a basement extension can achieve at that address.
- Wood Green (N22) — Edwardian terraces, post-war flats defines Wood Green, where edwardian terraces, post-war flats set what a basement extension can do. Edwardian houses rarely have a usable cellar across N22. Any Wood Green basement extension is validated by Haringey Council, with The Mall Wood Green the usual Wood Green reference point on the site plan.
- Crouch End (N8) — Edwardian terraces, village character defines Crouch End, where edwardian terraces, victorian villas set what a basement extension can do. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged across N8. Any Crouch End basement extension is validated by Haringey Council, with Crouch End Broadway the usual Crouch End reference point on the site plan.
- Muswell Hill (Haringey) (N10) — a basement extension in Muswell Hill (Haringey) starts from edwardian villas, 1930s semi-detached, and Muswell Hill (Haringey) reads as Edwardian villas and terraces. Edwardian houses rarely have a usable cellar in N10. Haringey Council assesses Muswell Hill (Haringey) basement extensions against its own Muswell Hill (Haringey) character guidance, and the location plan we draw for Muswell Hill (Haringey) references Muswell Hill Broadway.
- Highgate (Haringey) (N6) — Georgian and Victorian villages defines Highgate (Haringey), where georgian villas, victorian terraces set what a basement extension can do. Georgian houses here already have a vault and a lower-ground floor across N6. Any Highgate (Haringey) basement extension is validated by Haringey Council, with Highgate Wood the usual Highgate (Haringey) reference point on the site plan.
- Harringay (N4, N8) — basement extension work in Harringay means victorian terraces (harringay ladder). Harringay is Victorian terraced Ladder. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged throughout N4. Haringey Council decides the Harringay application, and Green Lanes anchors the Harringay location plan.
- Tottenham (N15, N17) — Victorian terraces, post-war estates defines Tottenham, where victorian terraces, post-war estates set what a basement extension can do. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged across N15. Any Tottenham basement extension is validated by Haringey Council, with Tottenham Hotspur Stadium the usual Tottenham reference point on the site plan.
- Stroud Green (N4) — basement extension work in Stroud Green means victorian terraces. Stroud Green is Victorian terraces. Victorian cellars here convert without planning permission when the footprint and external appearance are unchanged throughout N4. Haringey Council decides the Stroud Green application, and Stroud Green Road anchors the Stroud Green location plan.
Does Haringey planning policy restrict a basement extension?
Haringey conservation designations: there are 29 across Haringey Council, Muswell Hill, Crouch End, Tottenham Green among them. Designation costs a Haringey owner the permitted-development route: a basement extension then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Bruce Castle is the Haringey designation that most often changes a basement extension design.
What Article 4 removes near Haringey: Borough-wide Article 4 for HMO conversions. Before pricing a basement extension we check whether the N4 address is inside the mapped area, because Haringey Council draws the Haringey boundary street by street rather than across the whole of Haringey.
Haringey housing stock: Edwardian terraces in Crouch End, Muswell Hill; Victorian two-up-two-downs in Harringay Ladder; 1930s semi-detached in Muswell Hill; post-war in Tottenham. Muswell Hill and Crouch End have strong conservation coverage with clear loft/mansard precedents; Tottenham generally permissive. Read that before choosing a basement extension route in Haringey — construction, not postcode, sets what is achievable.
Who decides a basement extension on the edge of Haringey?
- Barnet — cross the Haringey boundary and Barnet Council takes the basement extension instead, applying 20 conservation areas of its own around N2. We re-price basement extensions at the Haringey edge because Barnet policy and Haringey policy rarely align on basement extension depth.
- Enfield — adjoining Haringey, with 22 conservation areas centred on EN1. A basement extension on the far side of the Haringey line is determined by Enfield Council, so the Haringey quote for basement extensions is checked against Enfield guidance before it is issued.
- Waltham Forest — cross the Haringey boundary and Waltham Forest Council takes the basement extension instead, applying 17 conservation areas of its own around E4. We re-price basement extensions at the Haringey edge because Waltham Forest policy and Haringey policy rarely align on basement extension depth.
- Hackney — the Hackney boundary runs against Haringey, so a basement extension a street from Haringey is decided by Hackney Council instead. Hackney runs 29 conservation areas across E2 and its neighbours, which is why basement extensions priced for Haringey are re-checked against Hackney policy whenever the Haringey address sits on that edge.
Sources for this Haringey basement extension page: borough policies maps and
conservation-area registers (2025–26), Royal Mail postcode district boundaries,
the Town and Country Planning (Fees for Applications) (England) Regulations, the Town
and Country Planning (General Permitted Development) (England) Order 2015 as amended,
and the Party Wall etc. Act 1996.
