Area guide · N14
House Extensions in Oakwood (N14)
Planning a house extension in Oakwood? We design, gain planning permission and build extensions and loft conversions across this most complete of 1930s tube suburbs, minutes from our Cockfosters base. Most single-storey rear extensions in Oakwood cost £45,000–£90,000 to build, applications go to Enfield Council, and the schemes going through N14 right now are prior-approval 6m rear extensions and hip-to-gable lofts — both made for Oakwood's hipped-roof semis. Start with a free site visit and we'll map precisely what your particular street allows.
Live planning data
What Enfield Council is actually approving right now
We track every residential planning decision across North London — so instead of guessing what Enfield will accept, you can see it. The borough is in generous form: 113 residential schemes approved borough-wide in a recent two-week window. Oakwood shares the N14 postcode with Southgate next door, and the recent N14 decisions show precisely the kind of work Oakwood's houses are built for:
- The Vale, N14 — householder extension approved through the prior-approval (larger home) route
- Chestnut Close, N14 — householder extension approved through the prior-approval route
The lesson in the data: prior approval is the N14 workhorse. It's the route that takes a semi-detached rear extension from the standard 3m to a full 6m — and a detached one from 4m to 8m — by consulting the neighbours rather than fighting a full application. On Oakwood's deep 1930s plots it's usually the first question worth asking. Pair it with a hip-to-gable loft conversion, the other scheme this hipped-roof stock was made for, and you've transformed the house without moving an inch.
Source: Enfield Council's public planning register. The examples chart the borough's recent approvals rather than our own portfolio — and because no two applications are alike, each one stands or falls on its specifics.
Local knowledge
Oakwood's housing stock — and what works on each
Oakwood barely existed before the Piccadilly line arrived in 1933 — the station is a Charles Holden design, now listed — and the suburb that grew around it is almost entirely of a piece: wide avenues of 1930s hipped-roof semis and detached homes, with Trent Park forming the green northern edge. That consistency is genuinely useful: what works on one Oakwood street tends to work on the next.
The hipped-roof semis along and off Bramley Road and Prince George Avenue. The backbone of Oakwood: bay-fronted semis with side passages and long gardens. Two moves dominate. The hip-to-gable loft with rear dormer (£55,000–£90,000) converts the wasted hip into a proper double bedroom with en-suite. The single-storey rear extension (£45,000–£90,000) — pushed to 6m under prior approval where the garden allows — creates the full-width kitchen-diner these houses never had. Plenty of owners phase both, a year or two apart.
The detached 1930s homes. Salted through the same avenues on wider plots. Permitted development is kinder to detached houses — 4m rear as standard, 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) without swallowing the garden.
The Trent Park edge. Oakwood's streets run up to Trent Park, and gardens backing onto green space enjoy outlooks most of London would queue for. A garden room or fully glazed rear extension makes the most of them — though addresses close to protected parkland can carry extra constraints, so we check yours before the design gets ambitious.
Every street is different. That's the point.
We design to Oakwood'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 estimateHonest numbers
What a house extension costs in Oakwood in 2026
These are realistic all-in build ranges for Oakwood — labour and materials to a good standard, excluding VAT, professional fees and kitchen fit-out:
| Extension type | Typical Oakwood cost | 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, Oakwood builds at £2,800–£4,200 per square metre — standard North London rates, driven by London labour and the care 1930s houses deserve. Run the maths on a 20m² rear addition at those rates and you land on £60,000–£80,000 of build cost. Spec moves the number more than anything — the same footprint can vary by £20,000 on glazing and kitchen choices alone. Your quote follows the free site visit: fixed, itemised down to the last line, and the total never drifts between signing and settling up.
Permissions, handled
Planning permission in Oakwood — what you need to know
Most Oakwood extensions don't need a full planning application. The permitted development baseline gives a semi 3m of single-storey rear depth and a detached house 4m; take the larger home prior-approval route and those figures rise to 6m and 8m — exactly the path the recent N14 approvals on The Vale and Chestnut Close took. Loft conversions enjoy a generous volume allowance, which Oakwood's big hipped roofs use to the full.
Where you do need permission: double-storey schemes, wrap-arounds, flats and maisonettes, and houses where previous owners have already spent the permitted development allowance. Once validated, a standard householder application at Enfield typically comes back inside eight weeks.
A note on the station: Oakwood station is listed — but listing protects the station building, not your semi up the road. Most Oakwood streets carry no conservation designation at all; we check your address against the council's conservation map as standard before any design work.
Party walls: with semis the dominant stock, the Party Wall Act applies to most Oakwood 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: where your project proceeds under permitted development, we obtain a Lawful Development Certificate — proof for future solicitors and surveyors that everything was lawful, protecting the value you've added.
How it works
How it works
- Free site visit — being minutes away in Cockfosters, we can usually walk your Oakwood semi within days: straight talk on feasibility, budget and the route through planning.
- Design & drawings — full plans and 3D visuals built around your hipped-roof house and the way you want to live in it.
- Planning, handled — we put the whole package into Enfield Council and steer it through to a decision.
- Fixed-price build — our vetted North London crew takes it from slab to sign-off, building control approved, with a clean handover at the end.
Our work
Recent work near Oakwood
Our build team's recent North London projects include a full house transformation taking a family home from 120m² to 360m², a 55m² garden room with kitchen and bathroom, and an Edwardian conversion in Finchley. Mention what you have in mind when we visit and we'll dig out the closest matches.
Questions, answered
Oakwood extension FAQs
What does an extension cost in Oakwood?
Budget £45,000–£90,000 for a single-storey rear build, £55,000–£90,000 for a hip-to-gable loft and £75,000 upwards for double-storey work, excluding VAT and fees. Oakwood sits on standard North London rates of £2,800–£4,200/m², with fixed, itemised quotes after a free site visit.
Can I extend 6 metres without full planning permission?
On most Oakwood semis, yes — through the larger home prior-approval route, where Enfield consults your neighbours instead of running a full application. The recent N14 approvals on The Vale and Chestnut Close went through exactly this way. Detached houses can reach 8m.
What suits a 1930s hipped-roof semi off Bramley Road best?
The combination this stock was made for: a hip-to-gable loft with rear dormer upstairs, and a rear extension creating an open-plan kitchen-diner downstairs. Done together or phased, they roughly double how big the house lives.
Oakwood station is listed — does that affect my house?
No. The Charles Holden station building is protected; its listing doesn't reach your home. Unless your own street carries a specific designation — which we check against Enfield's conservation map before designing — normal permitted development rights apply.
How quickly does Enfield Council decide?
Around eight weeks for a standard householder application, and the borough is approving at pace — 113 residential schemes in one recent two-week window. Prior-approval cases and lawful development certificates often resolve faster.
Will I need party wall agreements with my neighbours?
If you share a wall — and most Oakwood houses are semis — almost certainly, for both rear extensions and loft conversions. Allow £1,000–£2,500 per affected neighbour where surveyors are appointed. We handle the notices and keep it neighbourly.
Nearby areas we cover
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.…” read the full review
“Really impressed with the entire project. The side extension and conservatory have been finished to a very high standard and the team made the process straight forward and stress-free. It’s transformed the space and added so much value, would definitely recommend.”
“Brilliant experience with the extension company, transparent from the word go. Completed a double story extension for me and I couldn’t be more pleased. Thank you”
“I got the extension company to do a bathroom refurb for us a January they done a great job they managed to fit in a large shower as well as a bath”
Reviews shown word for word from our Google profile. Read all 8 reviews on Google
Free site visit
Ready to see what's possible on your street?
Free site visit anywhere in Oakwood, honest feasibility advice and a fixed, itemised price — design, planning and build handled end to end by the Pine Grove team.
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