Rear Dormer Loft Conversion Drawings in Harrow

Where in Harrow does a rear dormer actually get determined?

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

What changes about a rear dormer in each part of Harrow?

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

• Harrow on the Hill (HA1) — a rear dormer in Harrow on the Hill starts from georgian and victorian houses, listed buildings, and Harrow on the Hill reads as Georgian and Victorian conservation hilltop. A dormer on a Georgian roof has to sit behind the parapet line to stand any chance of consent in HA1. Harrow Council assesses Harrow on the Hill rear dormers against its own Harrow on the Hill character guidance, and the location plan we draw for Harrow on the Hill references Harrow School.
• Pinner (HA5) — a rear dormer in Pinner starts from tudor fragments, edwardian villas, 1930s semi-detached, and Pinner reads as Tudor and 1930s village. 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 HA5. Harrow Council assesses Pinner rear dormers against its own Pinner character guidance, and the location plan we draw for Pinner references Pinner High Street.
• Stanmore (HA7) — a rear dormer in Stanmore starts from 1930s semi-detached, edwardian villas, and Stanmore reads as 1930s semi-detached, Green Belt fringe. 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 HA7. Harrow Council assesses Stanmore rear dormers against its own Stanmore character guidance, and the location plan we draw for Stanmore references Stanmore Tube.
• Harrow Weald (HA3) — 1930s semi-detached, Green Belt defines Harrow Weald, where 1930s semi-detached set what a rear dormer can do. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis across HA3. Any Harrow Weald rear dormer is validated by Harrow Council, with Harrow Weald Common the usual Harrow Weald reference point on the site plan.
• Kenton (HA3) — a rear dormer in Kenton starts from 1930s semi-detached, and Kenton reads as 1930s semi-detached. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis in HA3. Harrow Council assesses Kenton rear dormers against its own Kenton character guidance, and the location plan we draw for Kenton references Kenton station.
• Wealdstone (HA3) — rear dormer work in Wealdstone means 1930s semi-detached, post-war flats. Wealdstone is 1930s semi-detached, post-war. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis throughout HA3. Harrow Council decides the Wealdstone application, and Wealdstone High Street anchors the Wealdstone location plan.
• North Harrow (HA2) — a rear dormer in North Harrow starts from 1930s semi-detached, and North Harrow reads as 1930s semi-detached. Hip-to-gable plus rear dormer is the standard sequence on these 1930s semis in HA2. Harrow Council assesses North Harrow rear dormers against its own North Harrow character guidance, and the location plan we draw for North Harrow references North Harrow Tube.

How do conservation areas and Article 4 affect a rear dormer in Harrow?

Conservation areas covering Harrow: Harrow Council runs 29, and Harrow Weald, Harrow on the Hill, Pinner Village are the ones Harrow owners meet most. A rear dormer inside a Harrow conservation area loses permitted development, so the Harrow submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Harrow Weald a rear dormer is judged on the street elevation first.

Article 4 and your Harrow rear dormer: Harrow Council has made no borough-wide direction, so permitted development for a rear dormer in Harrow generally survives outside Harrow conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a HA1 owner records that a rear dormer was lawful.

Harrow housing stock: 1930s semi-detached dominates; Edwardian villas in Harrow on the Hill and Pinner; Metropolitan Green Belt in Stanmore and Harrow Weald; post-war flats around Harrow Central. Outer north-west London suburban; Harrow on the Hill has exceptionally strict heritage controls; rest of borough permissive. Read that before choosing a rear dormer route in Harrow — construction, not postcode, sets what is achievable. Harrow Council charges £548 for a householder application and has 8 weeks to determine it.

Which neighbouring authorities border Harrow?

• Hillingdon — adjoining Harrow, with 29 conservation areas centred on HA4. A rear dormer on the far side of the Harrow line is determined by Hillingdon Council, so the Harrow quote for rear dormers is checked against Hillingdon guidance before it is issued.
• Barnet — adjoining Harrow, with 20 conservation areas centred on N2. A rear dormer on the far side of the Harrow line is determined by Barnet Council, so the Harrow quote for rear dormers is checked against Barnet guidance before it is issued.
• Brent — adjoining Harrow, with 22 conservation areas centred on NW2. A rear dormer on the far side of the Harrow line is determined by Brent Council, so the Harrow quote for rear dormers is checked against Brent guidance before it is issued.

Sources for this Harrow 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.