Area guide · EN1–EN2
House Extensions in Enfield (EN1 & EN2)
Looking for house extension builders in Enfield? We design, gain planning permission and build extensions and loft conversions across Enfield Town and Enfield Chase — from EN2's leafy conservation lanes to EN1's Edwardian and interwar streets — and Pine Grove's own team does the building. A single-storey rear extension here typically costs £45,000–£90,000 to build (add 10–15% in EN2's premium pockets), applications go to Enfield Council, and on a semi or terrace outside a conservation area the prior-approval route takes a single-storey rear to 6m without a full application. Arrange a free site visit and we'll set out what your street can take.
Planning in Enfield
What Enfield Council has recently approved
The decisions below come from the Enfield wards this page covers — Town, Ridgeway, Whitewebbs, Southbury, Bush Hill Park and Carterhatch — newest first, each with the route it took. Carterhatch runs across EN1 and EN3, and Bush Hill Park ward reaches into N21 and N9, so a few of those postcodes appear alongside EN1 and EN2.
The route that comes up most for single-storey rear extensions is prior approval. It's the streamlined process that takes a semi's rear extension from the standard 3m to a full 6m — and a detached house from 4m to 8m — by consulting the neighbours rather than assessing a full application. It isn't a formality: Enfield weighs the effect on the houses either side, and a deep rear that takes too much of a neighbour's light or outlook can be turned down. Refusals of it do happen here. The route isn't open on conservation-area streets, but elsewhere in EN1 and EN2, if your plans fit that envelope, it is usually the faster way through; if they don't, a well-designed full application is the route.
Southbury's decisions have a signature of their own. Its loft schemes often add a second, smaller dormer over the back addition as well as the main rear dormer — Enfield's descriptions call it a rear outrigger dormer — and they go through as lawful development certificates, because a rear dormer inside the volume limits is permitted development away from the conservation areas.
Recent planning decisions around Enfield
Extension, loft and basement applications decided in Enfield's Town, Ridgeway, Whitewebbs, Southbury, Bush Hill Park and Carterhatch wards, 23 Sep 2025 to 22 Sep 2026.
The newest decisions in those wards
- ApprovedSep 2026
Broadlands Avenue, EN3
Single storey rear extension involving demolition of existing lean-to rear extension.
26/02710/HOU · Enfield CouncilHouseholder application
- ApprovedSep 2026
Tenby Road, EN3
Single storey rear extension,extension to roof to side to form gable end and rear dormer.
26/03403/CEA · Enfield CouncilLawful development certificate
- ApprovedSep 2026
Rowantree Close, N21
Extension of roof to side to form gable, rear dormer and front roof lights.
26/03154/CEA · Enfield CouncilLawful development certificate
- ApprovedSep 2026
Poynter Road, EN1
Rear dormer with rear outrigger dormer and side windows.
26/02968/CEA · Enfield CouncilLawful development certificate
- RefusedSep 2026
Broadlands Close, EN3
Single storey rear extension to existing extension.
26/03109/HOU · Enfield CouncilHouseholder application
- ApprovedSep 2026
Wetherby Road, EN2
Single storey rear extension and rear dormer.
26/03265/CEA · Enfield CouncilLawful development certificate
- ApprovedSep 2026
Percival Road, EN1
Single storey rear extension 6m deep x 3m high (2.1m high to eaves of both sides) and single storey infill extension 3.705m deep x 3m high…
26/03286/PRH · Enfield CouncilPrior approval, larger home extension
- ApprovedSep 2026
Herrongate Close, EN1
Single storey rear extension 6m deep x 3m high (2.85m high to eaves).
26/03347/PRH · Enfield CouncilPrior approval, larger home extension
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.
Local knowledge
Enfield's housing stock — and what works on each
Enfield isn't one market — it's three, and the right scheme depends entirely on which one you're in.
The EN2 conservation core — Enfield Town and Forty Hill. EN2's historic streets, from Gentleman's Row inside the Enfield Town conservation area out to Forty Hill, which has a conservation area of its own, carry Georgian and Victorian character that the designations exist to protect. Permitted development is narrower here — side extensions, two-storey rears and the prior-approval route are all off the table — so extensions usually proceed as full applications with conservation-literate design: matched brick, correct proportions, joinery that belongs. These are also premium pockets where build costs run 10–15% above the borough norm, because the detailing has to earn its place.
Leafy EN2 and the Clay Hill green-belt edge. Beyond the conservation core, the west side runs to substantial semis and detached homes on generous plots, thinning towards green belt at Clay Hill, which is a conservation area too. Detached houses get a bigger permitted development allowance — 4m rears as standard and, outside the conservation areas, up to 8m with prior approval — and the plots take double-storey rear extensions (£75,000–£160,000) and wrap-arounds (£70,000–£140,000). Near the green-belt edge, volume limits can bite, so we check constraints before the design gets ambitious.
EN1 — Enfield Town's Edwardian and interwar streets. The town side is Edwardian terraces and semis plus interwar hipped-roof semis, street after street, with the Bush Hill Park conservation area covering part of it. The usual moves are the 6m prior-approval rear extension (£45,000–£90,000), the side-return (£35,000–£65,000) on the Edwardian stock, and the hip-to-gable loft with rear dormer (£55,000–£90,000) on the 1930s houses. For the roof, our loft conversions in Enfield page sets out which loft suits which EN1 and EN2 roof.
East of the town, Enfield's industrial belt is a different market altogether — we cover it on our Edmonton page.
Every street is different. That's the point.
We design to Enfield's stock and to what the council demonstrably approves — not to a template. A free site visit tells you what your house can take.
Get my free estimateBush Hill Park
Bush Hill Park has its own Enfield ward, south-east of the town centre. Most of its addresses are EN1, with N21 and N9 postcodes towards its southern end, and Enfield Council decides all of it.
Part of the ward is the Bush Hill Park conservation area, and planning.data.gov.uk maps an Enfield Article 4 direction over it as well. Inside that boundary, the national conservation-area rules already take a rear dormer, a side infill and anything over one storey at the back out of permitted development, and the prior-approval route is closed. The Article 4 direction removes more on top, so we read it for your address before drawing anything.
Outside the conservation area, the ward's decisions look like the rest of EN1: rear dormers, hip-to-gable lofts and 6m single-storey rears under prior approval. Two-storey extensions go in as householder applications, since a two-storey side extension is never permitted development and a two-storey rear rarely fits the depth and boundary limits.
Kitchen extensions in Enfield
Behind EN1's interwar semis the original kitchen is usually a narrow room at the back of the house, so the kitchen extension that earns its keep runs the full width of the rear and brings cooking, dining and the garden doors into one room. On a semi outside a conservation area, that rear can reach 3m with no application at all, or 6m through prior approval, which leaves space for an island as well as a proper dining table.
On the Edwardian terraces and semis the kitchen sits in the back addition, with a strip of side passage running alongside it. Infilling that passage with a side-return extension widens the kitchen and puts glazing along the old boundary line; wrapping round the back addition as well turns it into a wrap-around, which needs a full application.
In the Enfield Town, Forty Hill and Bush Hill Park conservation areas a side infill isn't permitted development and the prior-approval route is closed, so a kitchen scheme there usually goes to Enfield Council as a full application, judged on materials and proportion. Our kitchen extensions page covers layouts, glazing and roof lights in more depth, and the table below prices a kitchen extension with a mid-range kitchen included.
Honest numbers
What a house extension costs in Enfield in 2026
Each range below covers labour and materials to a good standard, excluding VAT and professional fees, and excludes kitchen fit-out except where the row says otherwise:
| Extension type | North London baseline costs (apply across EN1 & EN2) | On-site time | Usual planning route |
|---|---|---|---|
| Side-return extension | £35,000 – £65,000 | 2–3 months | Often permitted development |
| Single-storey rear | £45,000 – £90,000 | 3–4 months | Often permitted development |
| Kitchen extension (incl. mid-range kitchen) | £55,000 – £110,000 | 3–4 months | Often permitted development |
| Hip-to-gable loft + rear dormer | £55,000 – £90,000 | 6–10 weeks | Usually permitted development |
| Wrap-around extension | £70,000 – £140,000 | 4–6 months | Full application |
| Double-storey rear | £75,000 – £160,000 | 5–7 months | Full application |
| Garage conversion | £18,000 – £35,000 | 4–6 weeks | Usually permitted development |
As a rule of thumb, Enfield builds at £2,800–£4,200 per square metre — standard North London rates — with EN2's premium pockets around the conservation lanes running 10–15% above that, towards £4,700/m² at the top end. After the free site visit you get one fixed, fully itemised price — and it holds, so what you agree at signature is what appears on the final bill.
Permissions, handled
Planning permission in Enfield — what you need to know
Many Enfield extensions don't need a full planning application. The permitted development rules allow 3m of rear depth on semis and terraces and 4m on detached houses without any application at all, while the larger home prior-approval route widens that envelope to 6m and 8m. Loft conversions enjoy a generous volume allowance, well suited to EN1's hipped interwar roofs.
Where you do need permission: double-storey schemes, wrap-arounds, flats, and side, larger rear and roof extensions in the conservation areas — Enfield Town (which takes in Gentleman's Row), Forty Hill, Clay Hill and Bush Hill Park among them — where permitted development rights are restricted. Near Clay Hill, green-belt rules add volume limits. For any address, we check the council's conservation and constraint maps before designing.
Timing: allow about eight weeks between validation and a standard householder decision; prior-approval cases run to a shorter statutory deadline.
Party walls: semis and terraces dominate EN1 especially, so the Party Wall Act applies to many projects — budget £1,000–£2,500 per affected neighbour if surveyors are appointed, and start the conversation early. We serve the notices as part of the job.
Paperwork that pays: for permitted development schemes we secure a Lawful Development Certificate, so your extension survives every solicitor's question when you sell.
Across the London Borough of Enfield
Enfield Council decides applications well beyond EN1 and EN2, and each of these neighbouring parts of the borough has its own page:
- Southgate (N14) — Southgate Green and Southgate Circus are both designated conservation areas.
- Winchmore Hill (N21) — the Green and Vicars Moor Lane each have a conservation area, with Grange Park's just to the north-east.
- Palmers Green (N13) — the Lakes Estate conservation area, on the Fox Lane side, narrows what can be built without an application.
- Oakwood (N14) — its 1930s streets run up to Trent Park, a conservation area in its own right.
- Cockfosters (EN4) — split between two boroughs: Enfield decides the Trent Park side and the streets around the station, Barnet the avenues further west around Games Road and Mount Pleasant, so the exact address matters.
- Edmonton (N9 and N18) — the Church Street and Fore Street conservation areas cover its historic core.
- Hadley Wood (EN4) — Enfield Council decides it, and it has a conservation area of its own.
For Barnet and Haringey as well as Enfield, our guide to house extensions in North London, borough by borough takes each council in turn.
How it works
How it works
- Free site visit — EN1 terrace or EN2 detached, we come out, look properly, and talk honestly about feasibility, cost and the route through planning.
- Design & drawings — a complete drawing set with 3D visuals, shaped by your house and how your household actually runs.
- Planning, handled — we compile, submit and chase the application at Enfield Council until the decision is in.
- Fixed-price build — construction by Pine Grove's own North London team, signed off by building control and handed back tidy.
Our work
Recent work near Enfield
Nearby in Hadley Wood, Pine Grove's own team carried out a full house transformation, taking a family home from 120m² to 360m². The Hadley Wood case study has photos from the build, and at your site visit we can talk you through how that job ran.
Questions, answered
Enfield extension FAQs
How much is a house extension in Enfield?
Single-storey rear builds typically land between £45,000 and £90,000, lofts between £55,000 and £90,000, and double-storey schemes from £75,000 — excluding VAT and fees. EN1 sits on standard North London rates of £2,800–£4,200/m²; EN2's premium pockets run 10–15% higher.
What is prior approval, and why does it matter in Enfield?
It's the route to a bigger single-storey rear — up to 6m on a semi, 8m detached — with neighbour consultation instead of a full application, and you'll see it among the decisions on this page. It isn't available inside a conservation area, but elsewhere, if your plans fit the envelope, it's usually our first recommendation.
Can I extend a house in Gentleman's Row or Forty Hill?
Yes, with the right approach. Gentleman's Row sits inside the Enfield Town conservation area and Forty Hill has its own, so permitted development is restricted and side, wrap-around and two-storey schemes go in as full applications judged on materials, proportion and detail. Done well, sensitive extensions are approved — done cheaply, they're refused. We only do the first kind.
Does the green belt near Clay Hill stop me extending?
Not usually — householder extensions are still possible, but volume limits apply and over-large schemes get refused. Clay Hill is a conservation area as well, so we check your address against both sets of constraints and design to what the rules genuinely allow before you commit to anything.
How long does Enfield Council take to decide?
Allow around eight weeks from validation for a standard householder application. Prior-approval cases for larger single-storey rears run to a shorter statutory deadline, so they often conclude sooner.
Do you cover eastern Enfield too?
We build across the whole borough — the eastern side around the industrial belt simply has its own page under Edmonton, because the housing stock and planning picture differ. Wherever you are in EN1, EN2 or EN3, the free site visit works the same way.
What we build in Enfield
The same team designs, gets planning and builds — one fixed, itemised price whichever route your Enfield project takes.
Nearby areas we cover
What clients say
Rated 5.0 on Google
“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”
“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.”
“Our wrap-around extension has completely transformed the ground floor. We now have the open plan kitchen and family space we wanted without losing all of the garden. Thanks to everyone involved.”
“Really pleased with the work from The Extension Company. We had our extension done in Hampstead and the whole experience was excellent. Great communication from start to finish, The quality of the finish is excellent and we’re really happy with the result. Would definitely recommend them if you’re thinking about an extension.”
Reviews shown word for word from our Google profile. See 9 more client reviews · Read all 16 reviews on Google
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