Loft conversions · HA8
Loft Conversions in Edgware (HA8)
Planning a loft conversion in Edgware? Most conversions here cost £40,000–£90,000 to build depending on type, most applications are decided by Barnet Council, and HA8's Metroland semis are made for the hip-to-gable conversion with a rear dormer. Book a free site visit and we'll spell out what your roof can hold.
Planning in Edgware
Barnet Council's loft approvals and decisions in HA8
Most of Edgware is decided by Barnet, but HA8 is a three-council postcode: parts of it fall to Harrow and to Brent, each with its own register and its own validation checklist. The decisions listed below are Barnet's, from its Edgware and Edgwarebury wards, and those wards run over into NW7, which is why NW7 streets can appear in the list.
The useful thing to check is how each scheme was applied for. On a hipped HA8 semi, a hip-to-gable with a rear dormer and flush rooflights in the front slope can normally be drawn inside the 50 cubic metre allowance, so it goes in as a lawful development certificate and Barnet tests it against the rules rather than weighing up its looks. Anything listed as a householder application went through full planning, usually because it included something permitted development doesn't cover, such as a dormer on the front slope or a first-floor extension, or because the house had no permitted development rights left to use.
Recent loft decisions around Edgware
Extension, loft and basement applications decided in Barnet's Edgware and Edgwarebury wards, 23 Sep 2025 to 22 Sep 2026.
Loft decisions in those wards
- ApprovedAug 2026
Wolmer Gardens, HA8
Single storey rear extension. Roof extension involving hip to gable, rear dormer window, 2no front facing rooflights and 1no side gable…
26/2221/HSE · Barnet CouncilHouseholder application
- ApprovedAug 2026
Orchard Crescent, HA8
Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window
26/2747/192 · Barnet CouncilLawful development certificate
- ApprovedJul 2026
Hale Drive, NW7
Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window
26/2025/192 · Barnet CouncilLawful development certificate
- ApprovedJul 2026
Marlborough Avenue, HA8
Removal and alteration of existing roof above existing two storey side (Phase 1). Roof extension involving wraparound side and rear dormer…
26/2009/192 · Barnet CouncilLawful development certificate
- ApprovedJul 2026
Holmwood Grove, NW7
Roof extension involving hip to gable, rear dormer window, 2no. front facing rooflights and new side gable window
26/2530/192 · Barnet CouncilLawful development certificate
- ApprovedJul 2026
Deans Way, HA8
New front porch with pitched roof. Roof extension involving hip to gable, rear dormer window and 2no. front facing rooflights. Erection of…
26/1816/192 · Barnet CouncilLawful development certificate
- ApprovedJul 2026
Downhurst Avenue, NW7
Roof extension involving rear dormer window and 2no. front facing rooflghts. New front porch
26/1938/192 · Barnet CouncilLawful development certificate
- ApprovedJul 2026
Fairview Way, HA8
Roof extension involving hip to gable, rear dormer window with juliette balcony, 2no. front facing rooflights and new side gable window
26/2167/192 · Barnet CouncilLawful development certificate
Look a reference up on the council’s own register: Barnet Council planning search.
Source: GLA Planning London Datahub, 23 Sep 2025 – 22 Sep 2026. Data updated September 2026. This list last changed 23 September 2026. The datahub can lag a council’s own register by a few weeks.
These are council decisions on applications in these wards, shown as local planning context. They are not necessarily projects undertaken by us, and they are not our approval rate. Planning outcomes depend on your specific property and proposal.
Edgware's rooftops — and which loft suits each
Edgware's housing is more uniform than much of North London — but hip-to-gable country still has variety.
The 1930s hipped semis (the bulk of HA8). This is the heart of Edgware: Metroland semis with hipped roofs and side passages. The scheme that earns its place here is the hip-to-gable conversion with rear dormer — bring the side hip and the dormer into play and you net a double bedroom and en-suite at £55,000–£90,000.
Larger semis and detached homes (the leafier HA8 roads). On a wider roof an L-shaped dormer earns its keep — a main rear dormer with a return running over the back addition, which can unlock two or three rooms in a single project (£65,000–£95,000).
Terraced and townhouse pockets (around the Broadway and newer infill). With no hip to square off, the answer is usually a rear dormer (£40,000–£75,000); where you want every last square metre and the full ceiling height, a mansard that reshapes the entire rear roof is the stronger play (£60,000–£100,000).
Where head height is already generous. A Velux conversion leaves the roofline alone and keeps costs to £30,000–£45,000 — neat for a home office or single bedroom without touching the external shape.
For the ground floor, see our page on house extensions in Edgware; for a fuller look at each loft type before your visit, the loft conversions page has them all. If you are weighing Edgware up against the towns around it, start with our overview of loft conversions across North London.
Honest numbers
What a loft conversion costs in Edgware in 2026
These are realistic all-in build ranges for Edgware — labour and materials to a good standard, excluding VAT, fees and loose furnishings:
| Loft type | Typical Edgware cost | On-site time | Usual planning route |
|---|---|---|---|
| Velux / rooflight conversion | £30,000 – £45,000 | 6–8 weeks | Permitted development |
| Rear dormer | £40,000 – £75,000 | 6–9 weeks | Usually permitted development |
| Hip-to-gable + rear dormer | £55,000 – £90,000 | 7–10 weeks | Usually permitted development |
| L-shaped dormer | £65,000 – £95,000 | 8–10 weeks | Usually permitted development |
| Mansard | £60,000 – £100,000 | 8–10 weeks | Often a full application |
As a rule of thumb, Edgware loft costs run £2,800–£4,200 per square metre — North London rates, well above the national average. Our prices are fixed and itemised from the free site visit, so what you sign for is what you pay.
Permissions, handled
Planning a loft conversion in Edgware
Most Edgware lofts don't need a full planning application. As a rule a loft conversion sits inside permitted development, which lets you add up to 40 cubic metres of roof volume on a terrace and 50 cubic metres on a semi or detached property, as long as none of it reaches forward of the original front roof slope. On a hipped HA8 semi that allowance usually has room for a hip-to-gable with a rear dormer.
For most HA8 homeowners the sensible step is a Lawful Development Certificate (£274) — written proof that your loft was permitted development, which pays for itself the day you come to sell. When a full application is needed, usually for a mansard or a home that has already exhausted its allowance, the fee is £548 (from April 2026) plus the £91.02 portal service charge, with Barnet targeting a decision on standard householder applications in around eight weeks. The Watling Estate, on the Burnt Oak side of HA8, is a conservation area, and there no dormer is permitted development. If your home sits near the Harrow or Brent boundary, we confirm which council decides before drawing anything.
Two further outlays to plan for. Building control sign-off comes in at £500–£1,500. And as Edgware is overwhelmingly semi-detached, the Party Wall Act bites on most jobs — allow £700–£2,500 per neighbour if surveyors have to be brought in, though there's no charge at all where your neighbour agrees in writing within 14 days. We draft and serve the notices as part of the job and raise them with neighbours early.
How it works
How it works
- Free site visit — we take a proper look at your Edgware roof, gauge the head height and the structure, and give you a straight read on the right loft, the budget and the planning route.
- Design & drawings — we produce a complete set of plans and 3D visuals built around your roof's shape and your household's day-to-day needs.
- Planning, handled — we compile and submit the certificate or application to Barnet Council, then manage it through to a decision for you.
- Fixed-price build — Pine Grove Design & Build's own team builds it out, secures building control sign-off, and leaves the space neat and ready to use.
Our work
Recent work near Edgware
Among our build team's recent North London work is a full house transformation in Hadley Wood that took a family home from 120m² to 360m²; the Hadley Wood project write-up has the details. At your visit we'll go through how a hip-to-gable or rear dormer would sit on your hipped HA8 semi.
Questions, answered
Edgware loft conversion FAQs
How much does a loft conversion cost in Edgware?
The HA8 staple — a hip-to-gable with rear dormer — typically lands at £55,000–£90,000. A rear dormer alone is £40,000–£75,000 and a mansard £60,000–£100,000, both excluding VAT and fees. Edgware sits on North London rates of roughly £2,800–£4,200/m². We quote a fixed, itemised price after a free site visit.
Do I need planning permission for a loft conversion in Edgware?
Usually not — most lofts proceed under permitted development, and a hip-to-gable on a hipped HA8 semi normally fits the volume allowance, confirmed with a lawful development certificate. The exceptions that need a full application are mansards, front dormers, roofs in the Watling Estate conservation area and homes that have already spent their permitted development allowance.
What's the best loft for a 1930s semi in Edgware?
The hip-to-gable with rear dormer wins on a Metroland semi. It converts the wasted side hip and the rear slope in one move into a double bedroom and en-suite.
How long does an Edgware loft take to build?
A hip-to-gable on a standard HA8 semi is usually seven to ten weeks on site; a simpler Velux or rear dormer can be quicker. Add a few weeks beforehand for design and drawings, and note that a Lawful Development Certificate clears faster than a full application.
Which council decides — Barnet, Harrow or Brent?
Edgware is mostly Barnet, but the HA8 postcode also takes in streets decided by Harrow and by Brent. We establish which of the three your address sits with during the free consultation, well before any design work gets started.
Nearby areas we cover
Before you start a loft in Edgware
What clients say
Rated 5.0 on Google
“Used The Extension Company for a loft conversion on our semi detached in Barnet and couldn't be happier. They explained what was possible at the first visit, sorted the planning side, and gave a fixed price with no surprises at the end. The hip-to-gable and rear dormer gave us a big double bedroom with an en-suite. Tidy, professional and finished on schedule. Would recommend to anyone in North London thinking about a loft conversion.”
“We had been putting off our loft conversion for years because the whole process felt overwhelming. The team made it much easier than expected and handled the drawings, planning and build for us. We now have a lovely extra bedroom and shower room.”
“Excellent experience with The Extension Company. They completed our loft conversion and delivered exactly what they promised. The new bedroom and en-suite have added valuable space to our property in Barnet, the quality of the workmanship is first class. The team were friendly, knowledgeable and always happy to answer questions throughout the build.”
“Couldn't be happier with our loft conversion. We were expecting the build to be stressful, but it was actually a lot easier than we'd imagined. The lads were friendly, worked hard, and the quality of the finish is spot on. The extra room has made a massive difference and has given us the space we needed without having to move. Very pleased with the end result.”
“The Extension Company built a 5m single storey rear extension on our Victorian terrace in Crouch End. Went down the permitted development route so no planning application needed, which they explained up front and saved us months. Kitchen-diner now opens onto the garden with sliding doors. £87k all in, matched the quote.”
“From the initial site visit onwards to my property in Barnet, we felt that the team actually listened to what we wanted. They suggested a few changes to the layout that we hadn't considered, and those changes have made a huge difference. Would definitely use again and recommend”
Reviews shown word for word from our Google profile. See 9 more client reviews · Read all 16 reviews on Google
Ready to see what's possible on your street?
Free site visit anywhere in Edgware, honest feasibility advice and a fixed, itemised price — design, planning and build handled end to end.
Or call us — 020 3051 9430