Loft conversions · N14
Loft Conversions in Southgate (N14)
Planning a loft conversion in Southgate? Build costs here land at £40,000–£90,000 according to the type you choose, the decision rests with the London Borough of Enfield, and Southgate's hipped 1930s semis suit the hip-to-gable conversion with a rear dormer. Book a free site visit and we'll talk you through what your roof can carry.
Planning in Southgate
What Enfield Council's N14 approvals mean for a loft
Southgate falls within Enfield, though N14 runs west into Barnet around East Barnet and Brunswick Park, so the postcode alone doesn't settle the council. The loft decisions listed below are Enfield's, for Southgate and Arnos Grove, and each card shows how the council ruled.
On a hipped N14 semi, a hip-to-gable with a rear dormer normally goes in as a lawful development certificate: a check that the design sits inside the permitted development limits, not a judgement on its looks. One detail that trips schemes up is the balcony. A Juliet balcony, a rail across a full-height window with nothing to step out on, can sit within permitted development; a balcony or terrace you can stand on cannot, and needs planning permission. Southgate is also dotted with conservation areas, among them Southgate Green, Southgate Circus, Meadway and Abbotshall Avenue. On those streets no dormer is permitted development, so every dormer scheme goes through a householder application.
Recent loft decisions around Southgate
Extension, loft and basement applications decided in Enfield's Southgate and Arnos Grove wards, 23 Sep 2025 to 22 Sep 2026.
Loft decisions in those wards
- ApprovedAug 2026
Ashridge Gardens, N13
Extension to roof at side to form gable end with rear dormer, Juliette balcony, front rooflights and additional window at side.
26/02627/CEA · Enfield CouncilLawful development certificate
- ApprovedJul 2026
Wynchgate, N14
Conversion of garage into habitable room involving front extension, single storey rear extension, rear dormer involving hip to gable roof…
26/02384/HOU · Enfield CouncilHouseholder application
- ApprovedJul 2026
Hillside Grove, N14
Extension of roof to side to form gable, rear dormer and front roof lights.
26/02392/CEA · Enfield CouncilLawful development certificate
- RefusedJul 2026
Queen Elizabeths Drive, N14
Extension to roof at side to form gable end with rear dormer, front rooflights and juliet balcony (PART RETROSPECTIVE)
26/02061/HOU · Enfield CouncilHouseholder application
- ApprovedJun 2026
Wynchgate, N14
Extension of roof to side to form gable, rear dormer and front roof lights.
26/02016/CEA · Enfield CouncilLawful development certificate
- ApprovedJun 2026
Meadway, N14
Single storey rear extension involving replacement of existing extension, front dormer, replacement tiles to existing rear dormer…
26/01361/HOU · Enfield CouncilHouseholder application
- ApprovedJun 2026
Wynchgate, N14
Single storey rear extension, first floor side extension involving conversion of existing garage into habitable room, rear dormer, front…
26/01393/HOU · Enfield CouncilHouseholder application
- ApprovedJun 2026
Wilmer Way, N14
Extension to roof at side to form gable, rear dormer, Juliette balcony, front rooflights and additional window at side.
26/01846/CEA · Enfield CouncilLawful development certificate
Look a reference up on the council’s own register: Enfield 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.
Southgate's rooftops — and which loft suits each
Southgate's housing is fairly uniform, but there's still nuance street to street.
The 1930s hipped semis (the bulk of N14). This is the heart of Southgate — Metroland semis with hipped roofs and side passages. The scheme that fits is the hip-to-gable conversion with rear dormer: between the reclaimed side hip and the dormer you get a double bedroom and en-suite for £55,000–£90,000.
Detached and larger semis (around The Bourne, Chase Side fringe). A wider roof has the span for an L-shaped dormer — a rear dormer with a return reaching over a back addition — which can bring two or three rooms into use together (£65,000–£95,000), or alternatively a roomy standalone rear dormer (£40,000–£75,000).
Period terraces and townhouses (pockets near Southgate Circus). Where there's no hip to convert, a rear dormer is the natural answer, or a mansard (£60,000–£100,000) where maximum floor area justifies reshaping the whole rear roof.
Where head height is already good. A Velux conversion leaves the roof shape entirely as-is and holds the budget at £30,000–£45,000 — a straightforward way to gain a study or a single bedroom.
For the rear and side extensions N14 semis take downstairs, see house extensions in Southgate; for the full run of loft types, our loft conversions page lays them out. Southgate is one of ten North London towns with its own loft guide, and our page on loft conversions across North London links to every one.
Honest numbers
What a loft conversion costs in Southgate in 2026
The figures below are realistic all-in build ranges for Southgate, covering labour and materials finished to a good standard, with VAT, professional fees and loose furnishings left out:
| Loft type | Typical Southgate 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, Southgate loft costs run £2,800–£4,200 per square metre — North London rates, well above the national average. We set out a fixed, itemised quote after the free site visit, so the number you sign is the number you pay.
Permissions, handled
Planning a loft conversion in Southgate
Most Southgate lofts don't need a full planning application. Permitted development covers the large majority, and on a 1930s semi that headroom is generous: the rules allow you to add 50 cubic metres of roof volume to a semi or detached house, or 40 cubic metres to a terrace, so long as the new build stays behind the original front roof slope.
The certificate worth having here is a Lawful Development Certificate (£274), which puts in writing that the conversion was permitted development and tidies up the paperwork when you come to sell. Should a full application be unavoidable — typically a mansard, or a property that has already used up its volume — you're looking at £548 (from April 2026) plus the £91.02 portal service charge, with Enfield targeting a decision on standard householder applications inside roughly eight weeks.
Two costs left to account for. Reckon on £500–£1,500 for building control to sign the work off. The other is the Party Wall Act: with Southgate's streets being almost wall-to-wall 1930s semis, it touches nearly every job here, so allow £700–£2,500 per neighbour if surveyors come in — though the bill drops to nothing when a neighbour returns written consent inside 14 days. We draft the notices and get that conversation going early.
How it works
How it works
- Free site visit — we come and look over your Southgate roof, take a view on head height and structure, and tell you straight which loft suits it, what it should cost and how the planning is likely to run.
- Design & drawings — precise plans and 3D visuals worked up around your roof's geometry and how your household actually uses its rooms.
- Planning, handled — we assemble your certificate or application, file it with Enfield Council, and shepherd it through to a decision.
- Fixed-price build — construction is in the hands of Pine Grove's own team, who obtain building control sign-off and return a neat, completed loft.
Our work
Recent work near Southgate
Recent North London work from our build team includes a full house transformation in Hadley Wood, taking a family home from 120m² to 360m² — details are in the Hadley Wood case study. At the visit, we'll walk you through how a hip-to-gable would work on a hipped N14 semi.
Questions, answered
Southgate loft conversion FAQs
How much does a loft conversion cost in Southgate?
The N14 hip-to-gable with rear dormer typically costs £55,000–£90,000, a rear dormer £40,000–£75,000, and a mansard £60,000–£100,000 — figures that exclude VAT and fees. Across Southgate the going rate is roughly £2,800–£4,200/m², in line with the rest of North London. You get a fixed, itemised quote once we've made the free site visit.
Do I need planning permission for a loft conversion in Southgate?
Usually not — on a hipped N14 semi the conversion normally fits the permitted development volume allowance. Full applications are reserved mainly for mansards, dormers on conservation-area streets and homes that have already exhausted their permitted development allowance.
What's the best loft for a 1930s semi in Southgate?
A hip-to-gable with a rear dormer suits N14's hipped semis. It works the side hip and the rear slope together into a double bedroom with full standing height.
How long does a Southgate loft take to build?
A hip-to-gable on a typical N14 semi runs about seven to ten weeks on site; a Velux conversion is quicker still. Add a short stretch up front for design and drawings, and remember that a Lawful Development Certificate tends to come back sooner than a full application.
Is my Southgate home in a conservation area?
It could be. Enfield's conservation areas in Southgate and Arnos Grove include Southgate Green, Southgate Circus, Meadway and Abbotshall Avenue, and Southgate Green, Meadway and Abbotshall Avenue also have Article 4 directions. We confirm your address on Enfield's conservation map at the free consultation stage, ahead of any design work.
Nearby areas we cover
Before you start a loft in Southgate
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 Southgate, honest feasibility advice and a fixed, itemised price — design, planning and build handled end to end.
Or call us — 020 3051 9430