Loft conversions · Barnet · Enfield · Haringey
Loft conversions in North London, borough by borough
Quick answer: Most loft conversions and loft extensions in North London are one of two jobs: a hip-to-gable with a rear dormer on a hipped 1930s semi, or a rear or L-shaped dormer on a Victorian or Edwardian terrace. Outside conservation areas, most go through as permitted development, confirmed with a lawful development certificate; in a conservation area, a dormer or hip-to-gable needs a householder application. North London lofts are designed, managed and built by Pine Grove's own team.
Which council decides your house, and whether your street is protected, settles the route before the design does. Below are Barnet, Enfield and Haringey in turn: the dormer and hip-to-gable applications each council decided in the latest year of public records, the streets where the loft rules tighten, and the local loft guide for each town.
Who builds it
Who designs and builds your loft
North London lofts are designed, managed and built by Pine Grove's own team. The Extension Company is the extensions studio of Pine Grove Design & Build Ltd, so the loft conversion company that measures your roof and draws the dormer is the one that applies for the certificate or the permission, deals with building control and builds it.
That matters more on a loft than on most jobs, because the planning route shapes the design. A dormer that fits permitted development on one street needs a full application, and a design to suit the conservation area, on the next.
Local knowledge
The roofs North London lofts start from
Hipped 1930s semis. Between the wars, Barnet and Enfield filled with bay-fronted semis under hipped roofs: most of Southgate, Cockfosters, Edgware and Hendon, the avenues of East and New Barnet, and Enfield's EN1 streets. The hip slopes in at the side and takes a wedge out of the loft, so the usual scheme builds that side up into a gable and adds a rear dormer behind it, which normally gives room for a double bedroom with an en-suite.
Victorian and Edwardian terraces. Palmers Green, much of Winchmore Hill, Muswell Hill, Finchley's Church End and the streets around High Barnet's Wood Street have no hip to square off. Here a rear dormer across the back slope does the work, an L-shaped dormer carries on over the back addition where the house has one, and a mansard rebuilds the whole rear slope when floor area and ceiling height matter most.
Protected streets. In a conservation area the loft is designed around the area's character, not around the permitted development limits: a dormer kept low and set back behind the original ridge, or rooflights alone where the head height allows, which leaves the roofline as it is and is often the simpler route to consent.
Not sure which council, or which route?
A free site visit settles both for your house: who decides it, what applies on your street, and whether permitted development, a certificate or a full application suits the scheme.
Book my free site visitBarnet Council
Barnet: High Barnet to Finchley, Hendon and Edgware
Where Barnet decides
Barnet Council decides lofts in High Barnet, East and New Barnet, Finchley, Hendon and most of Edgware, where houses west of the High Street go to Harrow instead. It also takes the avenues on the western side of Cockfosters, around Games Road and Mount Pleasant, and the western fringe of Muswell Hill. Our guide to loft conversions in Barnet takes in High Barnet, East and New Barnet and the Monken Hadley edge.
Where the loft rules tighten
- Monken Hadley and Wood Street: conservation areas with Barnet Article 4 directions on top, which take away even smaller roof alterations such as rooflights, so a dormer or hip-to-gable there goes in as a householder application.
- Finchley Church End: parts of it are a conservation area, which changes the route for a rear dormer or a mansard.
- Hendon The Burroughs: a conservation area, so a dormer needs full planning permission, and where its Article 4 direction applies, rooflights do too.
- Hampstead Garden Suburb: roof changes need the Trust's consent as well as Barnet's, as our Hampstead Garden Suburb Trust guide explains.
Barnet Council loft decisions
| Decided | Approved | Refused |
|---|---|---|
| 576 | 467 | 109 |
| Decided | Approved | Refused |
|---|---|---|
| 326 | 265 | 61 |
Enfield Council
Enfield: Southgate, Cockfosters and the N13 and N21 terraces
Where Enfield decides
Enfield Council decides Southgate, Winchmore Hill, Palmers Green, Enfield Town and the EN1 and EN2 streets, plus the Trent Park side of Cockfosters and the streets around the station. Hadley Wood shares the EN4 postcode with East Barnet, but it is Enfield's too, and a handful of postcodes at the southern tip of Palmers Green belong to Haringey. Our guide to loft conversions in Southgate covers the hipped N14 semis that suit a hip-to-gable.
Where the loft rules tighten
- Winchmore Hill Green, Vicars Moor Lane and Grange Park: conservation areas where roof enlargements fall outside permitted development, so even a plain rear dormer needs a full application.
- Southgate Green, Bush Hill Park and Hadley Wood: conservation areas where Enfield's Article 4 directions also remove permitted development rights; check which rights the direction for your street covers.
- Trent Park: a conservation area on the Cockfosters edge, so check which side of its boundary the house sits before counting on permitted development.
Enfield Council loft decisions
| Decided | Approved | Refused |
|---|---|---|
| 583 | 521 | 62 |
| Decided | Approved | Refused |
|---|---|---|
| 169 | 150 | 19 |
Haringey Council
Haringey: Muswell Hill, Crouch End and Highgate
Where Haringey decides
Haringey decides Muswell Hill, Highgate, Crouch End, Hornsey, Wood Green and Tottenham, apart from the western fringe of Muswell Hill, which is Barnet's, and the west side of Highgate village, which is Camden's. Muswell Hill, Crouch End, Hornsey and Wood Green are mostly terraces and tall semis built before the First World War, where the usual loft is a rear dormer, carried round over the back addition as an L where the house has one. Our guide to loft conversions in Muswell Hill goes through N10's roofs and its conservation streets.
Where the loft rules tighten
- Muswell Hill, Fortis Green, Rookfield and Vallance Road: conservation areas, so even a modest rear dormer on these streets needs a householder application, with the design kept quiet behind the original ridge.
- Highgate and Crouch End: each has its own conservation area, and inside one a dormer is outside permitted development.
- Article 4 directions: the Haringey directions mapped on planning.data.gov.uk are all on employment land, so check the council's own list for your street.
Haringey Council loft decisions
| Decided | Approved | Refused |
|---|---|---|
| 255 | 231 | 24 |
| Decided | Approved | Refused |
|---|---|---|
| 40 | 37 | 3 |
Haringey loft guides
Permissions
Permitted development or planning permission
A loft on a house is usually permitted development. National rules allow up to 40m³ of extra roof volume on a terraced house and 50m³ on a semi-detached or detached one, provided nothing is built forward of the roof slope facing the road and nothing rises above the ridge. That 50m³ is usually enough for a hip-to-gable and a rear dormer together on a 1930s semi.
Three things take a North London loft outside those rules: a conservation area, where no roof enlargement is permitted development; an Article 4 direction, which can take away even smaller roof alterations such as rooflights, as Barnet's do in Monken Hadley and Wood Street; and a flat or maisonette, which has no permitted development rights for the roof. A mansard often needs an application anyway, because it changes the roof more than the limits usually allow.
Where the loft is permitted development, a lawful development certificate (£274) is the council's written confirmation, and the paper a buyer's solicitor will want to see. Where it is not, a householder application costs £548 plus the £91.02 Planning Portal charge, and Barnet, Enfield and Haringey each aim to decide one within eight weeks of validating it. Every loft needs Building Regulations approval, whichever route it takes.
Costs
What a North London loft costs
These are the guide build prices from our guide to loft conversion cost in London, before VAT and fees:
- Rooflight conversion: £30,000–£45,000
- Rear dormer: £40,000–£75,000
- Hip-to-gable with a rear dormer: £55,000–£90,000
- L-shaped dormer: £65,000–£95,000
- Mansard: £60,000–£100,000
Across North London that works out at £2,800–£4,200 per m², rising to £3,500–£5,000+ per m² on premium and conservation streets. The cost guide also itemises what comes on top: VAT, building control, the structural engineer and any party wall surveyors.
Across London
The rest of the house, and the rest of London
If the ground floor needs work too, our guide to house extensions in North London takes the same councils for rear, side and double-storey extensions, and a loft and an extension can be designed and built as one project. Every loft type, the permitted development limits in full and lofts across London are on our loft conversions page.
Questions, answered
North London loft conversion FAQs
Do I need planning permission for a loft conversion in North London?
Not usually, on a house outside a conservation area. Most lofts are permitted development within 40m³ of extra roof volume on a terrace or 50m³ on a semi or detached house, and a lawful development certificate confirms it. A dormer or hip-to-gable in a conservation area such as Muswell Hill, Monken Hadley or Winchmore Hill Green needs a householder application, as does any loft on a flat.
Which council decides my loft?
The council for the exact address, which in North London the postcode does not always tell you. Cockfosters is split between Enfield and Barnet, the western fringe of Muswell Hill is Barnet's rather than Haringey's, houses west of Edgware High Street go to Harrow, and Hadley Wood is Enfield's despite its EN4 postcode. We confirm it before any drawing starts.
What does a loft conversion cost in North London?
From £30,000–£45,000 for a rooflight conversion to £60,000–£100,000 for a mansard, with a hip-to-gable and rear dormer at £55,000–£90,000. These are guide build prices before VAT and fees, at £2,800–£4,200 per m²; the loft cost guide breaks them down by type and by house.
Who builds North London loft conversions?
Pine Grove's own team. The Extension Company is the extensions studio of Pine Grove Design & Build Ltd, and North London lofts stay with Pine Grove from the first survey to building control sign-off.
Where do the loft decision figures come from?
From the GLA Planning London Datahub, which gathers London councils' planning decisions. The tables count householder applications, lawful development certificates for proposed works and larger-home prior approvals whose description uses the usual wording for a rear dormer or a hip-to-gable. Withdrawn applications are left out, one application can count in both tables, and the figures are every applicant's decisions, not a record of our own projects. Council registers update first and the datahub can trail them by a few weeks, which is why each table links to the council's register.
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
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