Area guide · N2
House Extensions in East Finchley (N2): the High Road to the Suburb Edge
East Finchley is N2, not N3. It has its own station, its own High Road and its own Barnet ward, east of Finchley Central and Church End, which have a page of their own. We design, gain planning permission and build extensions and loft conversions across N2 — from the terraces around the High Road and Cherry Tree Wood to the Hampstead Garden Suburb fringe. Most single-storey rear extensions here cost £45,000–£110,000 to build, and most applications go to Barnet Council. Start with the free site visit — we'll give you an honest read on what your side of N2 allows.
Planning in East Finchley
What Barnet Council has approved in East Finchley
Barnet's public register lets you trade guesswork for evidence. The decisions listed here are from Barnet's East Finchley ward only, the terraced and semi-detached streets around the High Road, and they include the council's refusals as well as its approvals.
On the terraces, one roof scheme turns up again and again: a pair of dormers, one across the main roof and a second over the back addition, usually put in for a lawful development certificate. At ground level it is single-storey rears, some under the standard 3m allowance and some taken further through larger-home prior approval. Where a certificate is refused, the council has found the scheme as drawn to be outside the permitted development limits, which is usually a fixable problem rather than a verdict on the idea.
What the list leaves out matters as much. The Suburb side of N2 is Barnet's Garden Suburb ward, and its decisions are on our Hampstead Garden Suburb page. The Fortis Green side is decided by Haringey, not Barnet at all.
Recent planning decisions around East Finchley
Extension, loft and basement applications decided in Barnet's East Finchley ward, 23 Sep 2025 to 22 Sep 2026.
The newest decisions in those wards
- ApprovedSep 2026
Leicester Road, N2
Single storey rear extension. Roof extension involving rear dormer window. Erection of a rear outbuilding
26/3140/192 · Barnet CouncilLawful development certificate
- ApprovedSep 2026
Hertford Road, N2
Single storey rear extension with pitched roof and 3no. rooflights
26/2659/HSE · Barnet CouncilHouseholder application
- RefusedSep 2026
Oakview Gardens, N2
Single storey rear extension following demolition of the existing conservatory
26/2492/HSE · Barnet CouncilHouseholder application
- ApprovedAug 2026
Lincoln Road, N2
Roof extension involving 1no. Rear dormer window over main roof with juliette balcony and 1no. Rear dormer over outrigger roof and 3no…
26/2806/192 · Barnet CouncilLawful development certificate
- ApprovedAug 2026
Hertford Road, N2
Roof extension involving 1no. rear dormer window over main roof, 1no. rear dormer over outrigger roof and 2no. front facing rooflights..
26/2948/192 · Barnet CouncilLawful development certificate
- ApprovedAug 2026
Sylvester Road, N2
Roof extension involving rear dormer window and 3no. front facing rooflights
26/3040/192 · Barnet CouncilLawful development certificate
- ApprovedAug 2026
Hertford Road, N2
Single storey rear extension with a proposed depth of 6.00 metres, maximum height of 3.83 metres and eaves height of 2.44 metres.
26/2660/PNH · Barnet CouncilPrior approval, larger home extension
- RefusedAug 2026
Long Lane, N2
Single storey rear/side extension
26/2154/HSE · Barnet CouncilHouseholder application
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.
Local knowledge
East Finchley's housing stock — and what works on each
East Finchley spans a wide market — sensible terrace money at one end, very expensive residential streets at the other.
The terraces around the High Road and Cherry Tree Wood. Victorian and Edwardian terraces — the engine room of N2. The side-return extension (£35,000–£80,000) creates the full-width kitchen-diner; the loft conversion with rear dormer (£55,000–£110,000) adds the bedroom and en-suite; and the single-storey rear (£45,000–£110,000) is the well-travelled route at ground level.
The interwar streets on the N2 fringes. Hipped-roof 1930s semis — natural territory for the hip-to-gable loft conversion.
The Suburb edge and The Bishops Avenue. South-west of the High Road, the streets become carefully protected: this is the Hampstead Garden Suburb conservation area, with restricted permitted development rights and exacting design expectations. The Bishops Avenue has an N2 postcode too, but it sits inside the same conservation area and in Barnet's Garden Suburb ward. The houses there are large detached ones on generous plots, where double-storey rears (£75,000–£190,000) and full wrap-arounds (£70,000–£170,000) make sense, designed to Suburb standards from the first sketch rather than adapted afterwards.
Every street is different. That's the point.
We design to East Finchley'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 estimateN2 across two councils
N2 is not one planning area. Barnet decides most of it, through two wards: East Finchley, whose decisions this page shows, and Garden Suburb, which covers the Suburb side. Haringey decides the rest. Its Fortis Green ward reaches into N2 on the eastern side, around Fortis Green and Beech Drive, and its Highgate ward takes in another N2 corner.
So an N2 postcode on its own doesn't tell you the council. A house on the Haringey side is judged against Haringey's local plan and conservation areas, which our Muswell Hill page covers, and its application goes on Haringey's register. We check the boundary for your exact address before anything is drawn, and the North London borough guide sets out how the councils differ.
Honest numbers
What a house extension costs in East Finchley in 2026
The honest answer in N2 is "it depends which street". Most of East Finchley builds at North London baseline rates; the premium pockets towards the Suburb fringe and The Bishops Avenue run up to 20% over. Realistic all-in build ranges follow — exclusive of VAT, professional fees and kitchen fit-out:
| Extension type | Typical East Finchley cost | On-site time | Usual planning route |
|---|---|---|---|
| Side-return extension | £35,000 – £80,000 | 2–3 months | Often permitted development |
| Single-storey rear | £45,000 – £110,000 | 3–4 months | Often permitted development |
| Kitchen extension (incl. mid-range kitchen) | £55,000 – £130,000 | 3–4 months | Often permitted development |
| Loft conversion + rear dormer | £55,000 – £110,000 | 6–10 weeks | Usually permitted development |
| Wrap-around extension | £70,000 – £170,000 | 4–6 months | Full application |
| Double-storey rear | £75,000 – £190,000 | 5–7 months | Full application |
| Garage conversion | £18,000 – £42,000 | 4–6 weeks | Usually permitted development |
Expect £2,800–£5,000 per square metre in East Finchley — the standard £2,800–£4,200 North London baseline on most streets, pushed past on the premium ones where detailing and spec rise to meet the postcode. Scale it up and a 25m² family kitchen-diner spans £70,000–£125,000, street depending. Costs are confirmed in a fixed, itemised quote once we've visited — and fixed means fixed: the agreed total is the invoiced total.
Permissions, handled
Planning permission in East Finchley — what you need to know
The bulk of N2 extensions go ahead without a full planning application. Semis and terraces carry a 3m rear-extension allowance under permitted development, detached homes 4m — and the larger home extension scheme unlocks 6m and 8m via prior approval. Lofts have their own generous volume allowance, which is why the dormer pairs on the terraces so often go through as certificates.
Where permission is still required: double-storey and wrap-around schemes, flats, and most work on the Hampstead Garden Suburb side, where the conservation area restricts permitted development rights and design scrutiny is rightly high. Elsewhere, we check your address against the council's conservation map as part of the free consultation.
Barnet householder decisions land in roughly eight weeks as a rule, with prior approval and lawful development routes often faster. Semis and terraces mean party walls: budget £1,000–£2,500 per affected neighbour if surveyors are appointed — we prepare the notices as part of the job. And wherever your project proceeds under permitted development, we obtain a Lawful Development Certificate, so the works are unimpeachable when you sell.
How it works
How it works
- Free site visit — we walk your N2 property, High Road terrace or Suburb-fringe semi, and advise plainly on feasibility, spend and the route through planning.
- Design & drawings — thorough plans and 3D visuals designed around your home and your family's day-to-day.
- Planning, handled — the complete application prepared and submitted to the right council, with us managing it to decision.
- Fixed-price build — our vetted North London builders deliver it, building control signs it off, and you get a neat handover.
Our work
Recent work near East Finchley
A recent project from the build team is a full house transformation in Hadley Wood, taking a family home from 120m² to 360m²; the Hadley Wood project write-up has the details. Raise your East Finchley plans at your visit and we'll talk them through.
Questions, answered
East Finchley extension FAQs
Is East Finchley the same as Finchley?
No. East Finchley is N2, with its own station on the High Road and its own Barnet ward. Finchley Central and Church End are N3, with their own pair of wards and their own decision list, and North Finchley is N12. All three are decided by Barnet, but the streets, the housing and the conservation areas differ.
How deep can my rear extension go in East Finchley without full planning?
Up to 3m on a semi or terrace (4m detached) under standard permitted development — and up to 6m (8m detached) via the larger home extension prior approval route, where Barnet consults your neighbours before deciding. The larger-home route isn't available inside the Suburb's conservation area, and across most of the Suburb an Article 4 direction takes away the 3m allowance too, so we check that first.
Can houses on the Hampstead Garden Suburb fringe be extended?
Yes, but on the Suburb's terms: the conservation area restricts permitted development, so expect a full application and exacting design scrutiny. Schemes succeed when they're conceived to that standard from the start — that's how we design them.
Why do East Finchley extension quotes vary so much street to street?
Because N2 spans two markets. Terraces near the High Road build at baseline North London rates; the premium streets towards the Suburb fringe and The Bishops Avenue carry up to 20% more in detailing, spec and site logistics. Same postcode, different briefs.
Is a garage conversion a smart move in N2?
Often the smartest pound-for-pound: £18,000–£42,000 for a new habitable room with no garden lost, and usually no full application needed outside the conservation area.
What suits a terrace near Cherry Tree Wood?
The classic pairing: a side-return or rear extension for the kitchen-diner, and a dormer loft for the extra bedroom, often with a second dormer over the back addition.
What we build in East Finchley
The same team designs, gets planning and builds — one fixed, itemised price whichever route your East Finchley project takes.
- Kitchen extensions in East Finchley
- Side return extensions in East Finchley
- Double-storey & wrap-around in East Finchley
- Loft conversions in East Finchley
- Orangeries in East Finchley
- Garden rooms & offices in East Finchley
Checking the rules for East Finchley first?
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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