Area guide · N17 & N15
House Extensions in Tottenham (N17 & N15)
Planning a house extension in Tottenham? We design, gain planning permission and build extensions and loft conversions across N17 and N15, from the Bruce Castle quarter to South Tottenham. Most single-storey rear extensions here cost £40,000–£80,000 to build, applications go through Haringey Council, and the schemes being approved right now are modest rear extensions and roof works on Victorian terraces — exactly the stock Tottenham is made of. A free site visit will tell you precisely where your house stands — book one and we'll walk it with you.
Live planning data
What Haringey Council is actually approving right now
We track every residential planning decision across North London — so instead of guessing what your council will accept, you can see it. In the most recent two-week decision window, Haringey Council approved 32 residential schemes borough-wide, four of them in N17. The real Tottenham approvals:
- 54 Oak Avenue, N17 — 3.5m rear extension, enclosed front porch and hip-to-gable roof works (approved)
- Annexe at 44 Wilmot Road, N17 — 2m single-storey rear extension (approved)
- 12 Tilson Road, N17 — two flat-roof side dormers (approved)
The thread running through the list: well-judged, modest schemes are going through. Rear extensions between 2m and 3.5m, dormers that respect the roofline, a porch infill alongside — nothing speculative, everything in proportion to the terrace it sits on. That's genuinely useful intelligence: Haringey rewards schemes designed to the grain of the street, and that's precisely how we design.
Source: Haringey Council's public planning records. These decisions chart the borough's approvals rather than our own work, and each application is determined on its individual details.
Local knowledge
Tottenham's housing stock — and what works on each
Tottenham is one of North London's great Victorian terrace heartlands — and one of its best value-add stories. Build costs run about 10% below the North London average, while demand for finished family homes keeps rising on the back of the area's regeneration.
The Victorian terrace heartland (N17). Street after street of two-storey terraces with rear additions and side alleys. The classic moves: a side-return extension (£32,000–£58,000) to turn the narrow galley kitchen into a full-width kitchen-diner; a single-storey rear extension (£40,000–£80,000); or both together as a wrap-around (£63,000–£125,000). The Oak Avenue approval above shows the council passing rear-plus-roof combinations too. Party wall agreements with both neighbours are usually needed; we manage that process.
The High Road corridor and Bruce Castle quarter. Tottenham's historic spine carries real heritage — Bruce Castle, the Tudor manor house that's now the local museum, anchors a pocket of genuine conservation character, and the High Road's frontages have history all the way along. Around here, design and materials get more attention, and permitted development rights are restricted in conservation areas — so we check your address against the council's conservation map before any design work starts.
South Tottenham (N15). Tighter terrace grids and a high share of houses converted into flats and maisonettes. Honesty first: flats don't have householder permitted development rights, so extending one means a full planning application. It's done regularly — it just needs the right drawings and a properly argued case.
The stadium quarter. The regeneration around the stadium has brought new homes, new spending and a rising tide for the whole of N17. For homeowners the practical effect is confidence: extending in Tottenham means investing in an area on a visible upswing — and your householder application is still judged on its own merits, regeneration or not.
Every street is different. That's the point.
We design to Tottenham'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 Tottenham in 2026
These are realistic all-in build ranges for Tottenham — labour and materials to a good standard, excluding VAT, professional fees and kitchen fit-out:
| Extension type | Typical Tottenham cost | On-site time | Usual planning route |
|---|---|---|---|
| Side-return extension | £32,000 – £58,000 | 2–3 months | Often permitted development |
| Single-storey rear | £40,000 – £80,000 | 3–4 months | Often permitted development |
| Kitchen extension (incl. mid-range kitchen) | £50,000 – £100,000 | 3–4 months | Often permitted development |
| Hip-to-gable loft + rear dormer | £50,000 – £80,000 | 6–10 weeks | Usually permitted development |
| Wrap-around extension | £63,000 – £125,000 | 4–6 months | Full application |
| Double-storey rear | £68,000 – £145,000 | 5–7 months | Full application |
| Garage conversion | £16,000 – £32,000 | 4–6 weeks | Usually permitted development |
As a rule of thumb, Tottenham build costs run £2,500–£3,800 per square metre — roughly 10% below the wider North London rate of £2,800–£4,200/m². Costed at those rates, a 20m² rear addition comes to £50,000–£75,000 of build — and because finished family houses in N17 and N15 are in ever-stronger demand, the value case here is one of the best in our patch. Following the free site visit we issue a single fixed price, itemised line by line, and we hold to it: the contract figure and the final figure are the same figure.
Permissions, handled
Planning permission in Tottenham — what you need to know
Most Tottenham extensions don't need a full planning application. Terraces and semis can run a single-storey rear extension 3m deep under permitted development — detached houses get 4m — and the larger home scheme with prior approval pushes those depths to 6m and 8m. Loft conversions enjoy a generous volume allowance — dormer schemes like the one approved on Tilson Road are routine.
Where you do need permission: wrap-arounds and double-storey schemes, all flats and maisonettes (a big slice of N15), homes where PD rights have already been used up, and anywhere conservation character applies — notably along the historic High Road corridor, where permitted development rights are restricted. Standard householder applications at Haringey typically take around eight weeks to come back.
Party walls: Tottenham is overwhelmingly terraced, so the Party Wall Act applies to nearly every project — budget £1,000–£2,500 per affected neighbour if surveyors are appointed, and start the conversation early. We prepare the notices and keep neighbours onside; it's part of the job.
Our approach: we design to what Haringey demonstrably approves — modest, well-proportioned schemes that respect the terrace. And when a Lawful Development Certificate is the wiser path, we secure one: the paperwork that means no awkward questions when you come to sell.
How it works
How it works
- Free site visit — we walk your Tottenham terrace, listen hard, and tell you honestly what's feasible, what it'll cost and which planning route makes sense.
- Design & drawings — drawings worked up in detail with 3D visuals, fitted to your house and the way your family fills it.
- Planning, handled — the application goes into Haringey Council fully prepared, and we manage it through to the decision.
- Fixed-price build — our vetted North London team does the building, secures the building control certificate and hands back a clean site.
Our work
Recent work near Tottenham
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 your plans at the site visit and we'll match you with the most comparable projects.
Questions, answered
Tottenham extension FAQs
How much does a house extension cost in Tottenham?
Around £40,000–£80,000 for a single-storey rear extension build, £32,000–£58,000 for a side-return and £50,000–£80,000 for a hip-to-gable loft — excluding VAT and fees. N17 and N15 build rates run £2,500–£3,800/m², roughly 10% below the North London average, which makes Tottenham one of the strongest value-add areas we cover.
What is Haringey Council approving in Tottenham right now?
In the latest window we tracked: a 3.5m rear extension with hip-to-gable roof works on Oak Avenue, a 2m rear extension at the Wilmot Road annexe and two side dormers on Tilson Road — four N17 approvals out of 32 across the borough. Modest, well-proportioned terrace schemes are the ones going through.
What's the best extension for a Tottenham Victorian terrace?
The side-return is the classic: it reclaims the dead alley beside the kitchen for a full-width kitchen-diner. Pair it with a rear extension as a wrap-around if you need serious space, or add a dormer loft for extra bedrooms. We'll tell you which combination your plot and budget support at the site visit.
I'm near the High Road — will conservation rules affect my plans?
Possibly. The historic High Road corridor carries conservation character, and permitted development rights are restricted in conservation areas — meaning schemes that are automatic elsewhere need a full application there. We check your address against the council's conservation map before any design work starts, so there are no surprises.
My Tottenham house is split into flats — can I still extend?
Yes, but the route differs: flats and maisonettes have no householder permitted development rights, so every extension needs a full planning application. Plenty succeed — the latest approvals list even includes a non-standard property, the annexe on Wilmot Road — it just needs a properly argued case.
How long will the whole process take?
Typically 4–8 weeks for design and drawings, around 8 weeks for a Haringey householder decision, then 2–4 months on site for a single-storey scheme. Party wall notices — most Tottenham projects need them, at £1,000–£2,500 per neighbour if surveyors are appointed — run in parallel, so they rarely delay the start.
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
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