Rear Dormer Loft Conversion Drawings in Barnet (EN5)

Which EN5 postcodes does this rear dormer service cover?

Every EN5 postcode district we draw in, the stock that dominates it and the authority that validates a rear dormer there. EN5 fees below are the statutory England rates for 2026, not rear dormer estimates.

Which EN5 neighbourhoods suit a rear dormer best?

Roof pitch, wall build-up and plot depth change every few EN5 streets, and each one changes what a rear dormer can achieve at that address.

• Inside EN5: Barnet (EN5) — a rear dormer in Barnet starts from georgian fragments, 1930s semi-detached, and Barnet reads as Georgian and Victorian high street, 1930s residential. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent in EN5. Barnet Council assesses Barnet rear dormers against its own Barnet character guidance, and the location plan we draw for Barnet references Barnet High Street.
• Bordering EN5: Finchley (N3, N12) — a rear dormer in Finchley starts from 1930s semi-detached, edwardian villas, and Finchley reads as 1930s semi-detached, Edwardian villas. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses in N3. Barnet Council assesses Finchley rear dormers against its own Finchley character guidance, and the location plan we draw for Finchley references Finchley Central.
• Bordering EN5: Hampstead Garden Suburb (NW11) — rear dormer work in Hampstead Garden Suburb means arts & crafts houses, edwardian villas. Hampstead Garden Suburb is Arts & Crafts garden suburb, conservation. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout NW11. Barnet Council decides the Hampstead Garden Suburb application, and Central Square anchors the Hampstead Garden Suburb location plan.
• Bordering EN5: Golders Green (NW11) — rear dormer work in Golders Green means edwardian villas, 1930s semi-detached. Golders Green is Edwardian and 1930s semi-detached. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout NW11. Barnet Council decides the Golders Green application, and Golders Green Hippodrome anchors the Golders Green location plan.
• Bordering EN5: Muswell Hill (N10) — rear dormer work in Muswell Hill means edwardian villas, 1930s semi-detached. Muswell Hill is Edwardian villas and terraces. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout N10. Barnet Council decides the Muswell Hill application, and Alexandra Palace anchors the Muswell Hill location plan.
• Bordering EN5: Hendon (NW4) — a rear dormer in Hendon starts from 1930s semi-detached, post-war flats, and Hendon reads as 1930s semi-detached, post-war flats. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis in NW4. Barnet Council assesses Hendon rear dormers against its own Hendon character guidance, and the location plan we draw for Hendon references RAF Museum.
• Bordering EN5: Mill Hill (NW7) — a rear dormer in Mill Hill starts from georgian villas, 1930s detached and semi-detached, and Mill Hill reads as Georgian and 1930s detached. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent in NW7. Barnet Council assesses Mill Hill rear dormers against its own Mill Hill character guidance, and the location plan we draw for Mill Hill references Mill Hill Village.
• Bordering EN5: Edgware (HA8) — 1930s semi-detached, post-war flats defines Edgware, where 1930s semi-detached, post-war flats set what a rear dormer can do. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis across HA8. Any Edgware rear dormer is validated by Barnet Council, with Edgware Tube the usual Edgware reference point on the site plan.
• Bordering EN5: Colindale (NW9) — a rear dormer in Colindale starts from post-war flats, new-build, and Colindale reads as post-war flats, new-build. Trussed post-war roofs need a full structural redesign before a dormer in NW9. Barnet Council assesses Colindale rear dormers against its own Colindale character guidance, and the location plan we draw for Colindale references Colindale station.
• Bordering EN5: Whetstone (N20) — 1930s semi-detached, Edwardian villas defines Whetstone, where 1930s semi-detached, edwardian villas set what a rear dormer can do. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses across N20. Any Whetstone rear dormer is validated by Barnet Council, with Totteridge & Whetstone the usual Whetstone reference point on the site plan.

Does EN5 planning policy restrict a rear dormer?

Conservation areas covering EN5 (Barnet / Arkley): Barnet Council runs 20, and Hendon, Golders Green, Monken Hadley are the ones EN5 (Barnet / Arkley) owners meet most. A rear dormer inside a EN5 (Barnet / Arkley) conservation area loses permitted development, so the EN5 (Barnet / Arkley) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Monken Hadley a rear dormer is judged on the street elevation first.

EN5 (Barnet / Arkley) permitted development status: there is no borough-wide direction from Barnet Council, so a rear dormer at a EN5 address is normally still permitted development. We certify that with a £274 Lawful Development Certificate rather than leaving a EN5 (Barnet / Arkley) sale to argue it later.

EN5 (Barnet / Arkley) housing stock: 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. Read that before choosing a rear dormer route in EN5 (Barnet / Arkley) — construction, not postcode, sets what is achievable. Barnet Council charges £548 for a householder application and has 8 weeks to determine it.

Who decides a rear dormer on the edge of EN5?

• Camden — cross the EN5 (Barnet / Arkley) boundary and Camden Council takes the rear dormer instead, applying 40 conservation areas of its own around NW1. We re-price rear dormers at the EN5 (Barnet / Arkley) edge because Camden policy and Barnet policy rarely align on rear dormer depth.
• Haringey — cross the EN5 (Barnet / Arkley) boundary and Haringey Council takes the rear dormer instead, applying 29 conservation areas of its own around N4. We re-price rear dormers at the EN5 (Barnet / Arkley) edge because Haringey policy and Barnet policy rarely align on rear dormer depth.
• Enfield — a neighbour of the borough rather than of the postcode. Its 22 conservation areas, centred on EN1 and EN2, strip permitted development from many roofs inside them, but an Enfield designation stops at the Enfield boundary and never reaches an EN5 property. If your address is at the northern end of this district the register that matters is Hertsmere Borough Council's, and neither Enfield's nor Barnet's.
• Harrow — HA1 and the districts around it, 29 conservation areas, and a planning authority with no part in this postcode at all; Harrow does not adjoin EN5. It is worth naming because quotes get compared across north-west London, and a comparison only means something when the same council is reading the drawings. For EN5 that council is Barnet inside Greater London and Hertsmere Borough Council beyond it.

Sources for this EN5 rear dormer 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.