Where in Barnet does a conservation area application actually get determined?
Below: every Barnet postcode district on our books, the housing type that predominates there, and which authority validates an application at that address. One number frames the lot: 21.2% of the borough's 160,460 dwellings went up between 1930 and 1939 (VOA CTSOP4.1 dwelling stock by build period, 31 March 2025). Interwar semis, not Victorian terraces, are the typical subject here. Any fee shown below is the 2026 statutory rate set nationally, not our estimate of what your application will cost.
| Postcode | Area | Dominant stock | What it means for a conservation area application |
|---|
| NW4 | Hendon | 1930s semi-detached, post-war flats | NW4 is Hendon, all of it Barnet. Interwar semi-detached stock dominates, which in practice means a hipped end to square off and a rear roof deep enough to carry a dormer without touching the ridge line. |
| NW7 | Mill Hill | Georgian villas, 1930s detached and semi-detached | NW7 is Mill Hill, wholly inside Barnet. Mill Hill is itself one of the twenty designated areas, so plenty of NW7 addresses need a full application for work that would go ahead untouched a couple of streets outside the boundary. |
| NW9 | Colindale / Kingsbury | Post-war flats, new-build | NW9 spans Colindale and Kingsbury, and therefore spans Barnet and Brent. Colindale has changed quickly, which matters here because new development and designation boundaries sit close together. Establish the authority first, then establish whether the address is inside a designated area at all. |
| NW11 | Golders Green / Hampstead Garden Suburb | Arts & Crafts houses, Edwardian villas | NW11 covers Golders Green / Hampstead Garden Suburb only; Barnet Council handles the conservation area application. |
| EN4 | East Barnet / Cockfosters | 1930s semi-detached dominates; Edwardian villas in Muswell Hill | EN4 is cut by the Barnet–Enfield boundary through East Barnet and Cockfosters. The two authorities validate against different local lists, so settle which one owns the address before the package is finalised. A resubmission costs weeks you will not get back. |
| EN5 | Barnet / Arkley | Georgian fragments, 1930s semi-detached | EN5 takes in Chipping Barnet and Arkley and stays with Barnet Council throughout, decided against its own Local Plan. Designations including Wood Street and Monken Hadley reach into this district, so one EN5 address can need a full application where its neighbour two streets on does not. |
| HA8 | Edgware / Burnt Oak | 1930s semi-detached, post-war flats | HA8 belongs to Barnet alone, covering Edgware and Burnt Oak. Its case officers work the same eight-week target as the rest of the borough and read the same designation map — check your address against that map before assuming the roof still carries permitted development rights. |
| N10 | Muswell Hill | Edwardian villas, 1930s semi-detached | Muswell Hill sits astride the N10 boundary, so the file opens at either Barnet or Haringey depending on the street. If it opens at Barnet, plan around the timetable rather than the outcome: 3,222 householder decisions were issued inside eight weeks, but 61 needed more than sixteen and fourteen ran beyond a year. |
What changes about a conservation area application in each part of Barnet?
Pitch, wall construction and plot depth change street by street in this borough, and each change alters what an application can realistically ask for at that particular address.
- Finchley (N3, N12) — 1930s semi-detached, Edwardian villas defines Finchley, where 1930s semi-detached, edwardian villas set what a conservation area application can do. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed across N3. Any Finchley conservation area application is validated by Barnet Council, with Finchley Central the usual Finchley reference point on the site plan.
- Hampstead Garden Suburb (NW11) — Arts & Crafts garden suburb, conservation defines Hampstead Garden Suburb, where arts & crafts houses, edwardian villas set what a conservation area application can do. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed across NW11. Any Hampstead Garden Suburb conservation area application is validated by Barnet Council, with Central Square the usual Hampstead Garden Suburb reference point on the site plan.
- Golders Green (NW11) — conservation area application work in Golders Green means edwardian villas, 1930s semi-detached. Golders Green is Edwardian and 1930s semi-detached. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed throughout NW11. Barnet Council decides the Golders Green application, and Golders Green Hippodrome anchors the Golders Green location plan.
- Muswell Hill (N10) — a conservation area application in Muswell Hill starts from edwardian villas, 1930s semi-detached, and Muswell Hill reads as Edwardian villas and terraces. Edwardian houses here typically need the same householder set plus a roof plan where a dormer is proposed in N10. Barnet Council assesses Muswell Hill conservation area applications against its own Muswell Hill character guidance, and the location plan we draw for Muswell Hill references Alexandra Palace.
- Hendon (NW4) — 1930s semi-detached, post-war flats defines Hendon, where 1930s semi-detached, post-war flats set what a conservation area application can do. On these 1930s semis the prior approval route often replaces a full application across NW4. Any Hendon conservation area application is validated by Barnet Council, with RAF Museum the usual Hendon reference point on the site plan.
- Mill Hill (NW7) — Georgian and 1930s detached defines Mill Hill, where georgian villas, 1930s detached and semi-detached set what a conservation area application can do. Applications on Georgian stock here almost always need a heritage statement alongside the drawings across NW7. Any Mill Hill conservation area application is validated by Barnet Council, with Mill Hill Village the usual Mill Hill reference point on the site plan.
- Edgware (HA8) — a conservation area application in Edgware starts from 1930s semi-detached, post-war flats, and Edgware reads as 1930s semi-detached, post-war flats. On these 1930s semis the prior approval route often replaces a full application in HA8. Barnet Council assesses Edgware conservation area applications against its own Edgware character guidance, and the location plan we draw for Edgware references Edgware Tube.
How do conservation areas and Article 4 affect a conservation area application in Barnet?
Conservation areas covering Barnet: Barnet Council runs 20, and Hendon, Golders Green, Monken Hadley are the ones Barnet owners meet most. A conservation area application inside a Barnet conservation area loses permitted development, so the Barnet submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Hampstead Garden Suburb a conservation area application is judged on the street elevation first.
Article 4 and a Barnet conservation area application: the council has made no borough-wide direction, so permitted development rights generally survive outside the designated areas and listed curtilages. Putting it beyond argument is what a Lawful Development Certificate does. Barnet logged 2,585 certificate applications across the same three-year window (MHCLG PS1, retrieved 3 September 2026), and the return publishes no split between grants and refusals for certificates — not in this borough, not in any English authority — so no success rate exists for anyone to quote at you.
The building fabric around Barnet: 1930s semi-detached dominates; Edwardian villas in Muswell Hill, Finchley; Garden Suburb Arts & Crafts in Hampstead Garden Suburb; post-war flats in Colindale. Suburban outer-London borough; permitted development used heavily; Hampstead Garden Suburb has its own residents' trust with additional design controls. A conservation area application in Barnet is scoped against that stock first.
Who decides a conservation area application on the edge of Barnet?
- Enfield — adjoining Barnet, with 22 conservation areas centred on EN1. A conservation area application on the far side of the Barnet line is determined by Enfield Council, so the Barnet quote for conservation area applications is checked against Enfield guidance before it is issued.
- Harrow — adjoining Barnet, with 29 conservation areas centred on HA1. A conservation area application on the far side of the Barnet line is determined by Harrow Council, so the Barnet quote for conservation area applications is checked against Harrow guidance before it is issued.
- Brent — the Brent boundary runs against Barnet, so a conservation area application a street from Barnet is decided by Brent Council instead. Brent runs 22 conservation areas across NW2 and its neighbours, which is why conservation area applications priced for Barnet are re-checked against Brent policy whenever the Barnet address sits on that edge.
- Camden — cross the Barnet boundary and Camden Council takes the conservation area application instead, applying 40 conservation areas of its own around NW1. We re-price conservation area applications at the Barnet edge because Camden policy and Barnet policy rarely align on conservation area application depth.
Sources for this Barnet conservation area application 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.
