Real numbers, real Enfield projects
Extension Costs in Enfield
Extension cost guides that quote a single national average aren't much use when you're trying to budget for a specific street in Enfield. Here's what recent local projects have actually involved, by extension type, so you have a realistic starting point before you get a fixed quote.
What actually drives the price
Extension costs by type, in Enfield
Every quote depends on structural work, specification, and site-specific complications, so treat the ranges below as a starting point for budgeting, not a fixed price. The biggest swing factors are the finish level (a builder's-grade kitchen extension and an architect-led glazed box cost very differently at the same floor area), and what's found once walls are opened up on an older Enfield property.
| Extension type | Typical scope | What moves the price |
|---|---|---|
| Side-return extension | Widening a narrow Victorian/Edwardian kitchen into the side passage | Party wall works, existing drainage position, roof glazing choice |
| Rear extension (single storey) | Extending the back of the house for a larger kitchen-diner | Depth of extension, roof lantern vs flat rooflights, bi-fold vs sliding doors |
| Double-storey extension | Ground floor space plus an additional bedroom or bathroom above | Foundation depth on Enfield's clay-heavy ground, roof tie-in complexity |
| Wraparound extension | Combined rear and side-return, common on larger semi-detached plots | Total floor area, structural steel spans, number of openings into the existing house |
As a general guide, house extensions across North London typically range from £60,000 to £120,000 or more depending on size and specification. We provide a detailed, itemised quotation after a site survey so you can see exactly what's driving the cost for your property, rather than working from a generic figure.
Completed nearby
Recent extensions built around Enfield
Photos of finished projects are useful, but they don't tell you much about the property they started as. Here's a little more context on a few recent builds.
Roch Close, Enfield
Kitchen extension, semi-detached
A rear kitchen extension opening the ground floor into a single open-plan kitchen-diner, with an island and garden doors.
Enfield
Rear extension with bi-fold doors
A single-storey rear extension replacing a dated kitchen with a bright, garden-connected family space.
Arkley, near Enfield
Period property extension
A Victorian-era property extended with careful attention to matching brick and existing period detailing.
Why quotes vary so much
What a headline price doesn't tell you
Two Enfield rear extensions at the same floor area can cost very differently, and it's rarely down to the builder simply charging more. It's usually one of these.
Want the full picture before you enquire?
Our main Enfield extension guide covers planning permission, property types, process and local streets in full detail. If you're also considering a loft conversion or full refurbishment, see our general Enfield building services too.
Verify it yourself
Where these figures come from
We'd rather you check the source than take a builder's word for it.
Extension cost FAQs
Questions about extension pricing in Enfield
Why do extension quotes vary so much between builders?
Different builders may be quoting for different scope, specification level, or contingency for site-specific issues. A quote significantly below others for the same work is more often a sign of missing scope than genuine efficiency. Compare itemised quotes rather than single headline totals.
What's included in a Firtree Build extension quote?
Our quotes are itemised and fixed, written into your contract, covering structural work, materials, finishes and the agreed specification, so there are no surprise charges during the build.
Does an extension in Enfield add more value than it costs?
It depends on the property, area and quality of the finished work, but with Enfield's average house price at £475,000 and home-movers paying an average of £604,000 for their next property, extending is a genuine financial alternative to moving for many homeowners.
Should I get more than one quote?
Yes. Comparing itemised quotes from more than one builder is the most reliable way to understand fair pricing for your specific project, and lets you check that scope, specification and payment terms are genuinely comparable.
Want a real number for your property?
Get a free, itemised quote
We'll visit your Enfield property, talk through the options, and give you a clear, itemised price, not a generic estimate pulled from an average.
