Area guide · IG7
House Extensions in Chigwell (IG7)
Planning a house extension in Chigwell? We design, gain planning permission and build extensions and loft conversions across IG7 — from the old village around St Mary's to Grange Hill and the substantial detached homes in between. Most single-storey rear extensions here cost £52,000–£105,000 to build, applications go through Epping Forest District Council, and the schemes Chigwell's plots invite are large glazed rear extensions, double-storey schemes and annexes. Start with a free site visit — we'll read your plot's designations and tell you what it can realistically hold.
Live planning data
What Epping Forest District Council is approving right now
We track residential planning decisions along the whole corridor we cover, from North London out through the Epping Forest district. We don't publish street-level Chigwell examples in the current window — but across the district's decision lists, the recurring householder schemes are rear extensions, loft conversions and garage conversions, and on plots like Chigwell's the briefs scale up: substantial single-storey rears with structural glazing, double-storey extensions, and annexe-style outbuildings.
Two Chigwell-specific realities shape almost every project here. First, the conservation character of the old village around St Mary's, where design and materials carry real weight. Second, the green belt that surrounds much of the town — where volume limits genuinely bite, particularly on outbuildings. Neither is a deal-breaker; both reward knowing the rules before you sketch. That's where we start.
Source: the district council's open planning records for Epping Forest. They show which scheme types win approval across the district — our own work isn't among them, and every application stands on its individual merits.
Local knowledge
Chigwell's housing stock — and what works on each
Chigwell is one of the wealthiest corners of our coverage, and the briefs match: bigger plots, bigger spans, higher spec.
The old village around St Mary's. Chigwell's historic core — the church and the streets around it — carries genuine conservation character. Permitted development rights are restricted in conservation areas, so schemes here go through full applications where materials, proportion and roofline are scrutinised properly. Extensions still happen; they're simply designed to deserve their setting.
Grange Hill. Family homes on generous plots near the Central line — interwar and post-war stock that takes the classic moves well: loft conversions (£65,000–£105,000), single-storey rears and garage conversions (£20,000–£40,000).
The big detached plots. Chigwell's signature. Substantial detached houses with the space — and the appetite — for serious schemes: large single-storey rear extensions with structural glazing (£52,000–£105,000 and beyond, depending on span and spec), double-storey extensions (£85,000–£190,000) and annexes for multi-generational living. Detached homes also enjoy the most generous permitted development allowances: 4m rear extensions without an application, 8m via prior approval.
The green-belt fringe. Much of Chigwell is wrapped in green belt, and this is where ambitions need early reality-checking — volume limits on outbuildings bite hard, and annexes need careful sizing and siting to succeed. We check your plot's designations before any design work, so the scheme you fall in love with is one the council can approve.
Every street is different. That's the point.
We design to Chigwell'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 Chigwell in 2026
These are realistic all-in build ranges for IG7 — labour and materials to a good standard, excluding VAT, professional fees and kitchen fit-out:
| Extension type | Typical Chigwell cost | On-site time | Usual planning route |
|---|---|---|---|
| Side-return extension | £40,000 – £78,000 | 2–3 months | Often permitted development |
| Single-storey rear | £52,000 – £105,000 | 3–4 months | Often permitted development |
| Kitchen extension (incl. mid-range kitchen) | £65,000 – £130,000 | 3–4 months | Often permitted development |
| Hip-to-gable loft + rear dormer | £65,000 – £105,000 | 6–10 weeks | Usually permitted development |
| Wrap-around extension | £80,000 – £165,000 | 4–6 months | Full application |
| Double-storey rear | £85,000 – £190,000 | 5–7 months | Full application |
| Garage conversion | £20,000 – £40,000 | 4–6 weeks | Usually permitted development |
Chigwell build costs run £3,200–£5,000 per square metre — 15–20% above the North London baseline of £2,800–£4,200/m², reflecting the larger spans, structural glazing and finish level these houses call for. At those rates, budgeting £65,000–£100,000 of build for a 20m² rear addition is realistic — and the big glazed schemes Chigwell favours go beyond that. Our quotes follow the free site visit and arrive fixed and itemised in full; the sum on the signature page is the sum that leaves your account, no more.
Permissions, handled
Planning permission in Chigwell — what you need to know
Detached homes get the best deal. A detached house can take its rear extension to 4m under permitted development where semis and terraces stop at 3m — and through the larger home scheme's prior approval, detached stock reaches a full 8m against the 6m allowed for semis. On Chigwell's detached-heavy streets, that's a genuine advantage. Loft conversions enjoy a generous volume allowance.
Where you do need permission: double-storey rears and wrap-arounds, anything in conservation settings like the old village around St Mary's (permitted development rights are restricted in conservation areas), and — crucially here — green belt plots, where volume limits constrain how much you can add and bite hardest on outbuildings and annexes. From validation, Epping Forest District Council works to roughly an eight-week turnaround on standard householder applications.
Party walls: detached homes often escape party wall awards entirely, but works near a shared boundary can still trigger the Act — where it applies, budget £1,000–£2,500 per affected neighbour if surveyors are appointed. We prepare any notices as part of the job.
Our approach: we establish your plot's designations — green belt, conservation, the lot — before designing a single line, then design to what the district demonstrably approves. And where a Lawful Development Certificate makes better sense, we'll obtain it on your behalf — formal confirmation of lawfulness that protects the sale value of everything you've built.
How it works
How it works
- Free site visit — we walk your Chigwell plot end to end, hear your ambitions, and give honest guidance on feasibility, cost, designations and the planning route.
- Design & drawings — drawings at the scale these plots deserve: detailed plans and 3D visuals matched to your house and how you want to live.
- Planning, handled — we assemble the full submission for Epping Forest District Council and manage the case until it's determined.
- Fixed-price build — our vetted team executes the build, brings building control through to sign-off and hands over a finished, tidy site.
Chigwell's golden-triangle briefs
At the top of Chigwell's market the brief stops being an extension and becomes a transformation: the detached house on Manor Road scale plots reworked wholesale, glazed to the garden, sometimes dug for a leisure floor. Projects like that reward a design-and-build team set up for exactly that scale.
Ours is the large and luxury extensions service, fixed-price and design-led, with every band set out in the luxury extension cost guide.
Our work
Recent work near Chigwell
Our build team's recent North London projects — a short hop from Chigwell — include a full house transformation taking a family home from 120m² to 360m², a 55m² garden room with kitchen and bathroom (exactly the annexe-style brief Chigwell's plots suit), and an Edwardian conversion in Finchley. Raise your brief at the site visit and we'll show you the projects that come closest to it.
Questions, answered
Chigwell extension FAQs
Why do extensions cost more in Chigwell than elsewhere?
Because the briefs are bigger: larger spans, structural glazing, higher finish levels. IG7 build rates run £3,200–£5,000/m² — 15–20% above the North London baseline — and a substantial glazed rear extension here is a different animal from a standard terrace scheme. The value the right scheme adds to a Chigwell house is proportionate.
How far can I extend a detached Chigwell house without full planning permission?
Up to 4m to the rear under permitted development, and up to 8m via the larger home extension scheme's prior-approval process — the most generous allowances going, and one of the quiet advantages of detached stock. Double-storey schemes always need a full application, and green belt or conservation designations change the picture, so we check first.
Can I build an annexe in my Chigwell garden?
Often, yes — multi-generational annexes are one of the schemes Chigwell's plots invite. But the green belt that surrounds much of the town puts hard volume limits on outbuildings, so size and siting decide success. We assess your plot's designations first and design an annexe the council can actually approve.
Does green belt mean I can't extend at all?
No. Green belt policy limits how much volume you can add — and bites hardest on outbuildings — but well-judged extensions to existing houses are approved regularly across the district. Proportionate design is the key, and each case is weighed on its own particulars; we tell you honestly at the site visit what your plot will support.
We're in the old village near St Mary's — what changes?
Conservation character means design and materials carry real weight, and permitted development rights are restricted in conservation areas — so expect a full application judged on quality. Done properly, that protects exactly what makes the old village special, and your investment with it. We check your address against the council's conservation map before designing.
Which council decides, and how long will it take?
Epping Forest District Council — Chigwell is Essex, not Greater London — with standard householder decisions in around eight weeks. Allow 4–8 weeks of design before submission and 3–7 months on site depending on the scheme, with the big double-storey projects at the longer end.
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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
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Free site visit anywhere in Chigwell, 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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