House Extensions in Northwood, HA6
Rear, side-return, wraparound and double-storey extensions for houses in Northwood, designed, approved and built by one team.
Covered under one contract
- Architectural and structural design
- Planning or lawful development certificate
- Foundations, walls, roof and steels
- Glazing, rooflights and doors
- Kitchen designed and fitted
- Building control and party wall handled
House Extensions in Northwood.
An extension is the surest way to get the open-plan kitchen and dining room most families want, and the houses in Northwood generally lend themselves to it: a side return to fill, a rear garden to build into, or on larger plots room for a full-width or double-storey addition.
We design the extension around how you will use it, not around the maximum footprint the rules allow. That means thinking about light, the level change to the garden, where the kitchen sits, how the old and new parts of the house meet and what happens to the rooms you already have. The structural engineering, party wall matters and building control inspections are all handled by us.
Approvals are checked on the first visit. Many single-storey rear extensions fall within permitted development, but the London Borough of Hillingdon applies tighter rules in conservation areas and to flats and listed buildings, so we confirm the route before any drawings are produced and then manage the application if one is needed.
- Area
- Northwood, HA6
- Council
- London Borough of Hillingdon
- Housing
- Large Edwardian and inter-war detached houses on wide plots, 1930s semis, post-war houses towards Moor Park
- Transport
- Northwood, Northwood Hills (Metropolitan)
- Rear or side return, on site
- 10 to 16 weeks
- Design and approvals
- 8 to 14 weeks before start
- Glazing lead time
- 6 to 10 weeks, ordered early
- Consent
- Permitted development or householder application
- Party wall
- Notices served by us
Northwood: the houses and the planning rules.
Northwood grew up around the Metropolitan line station in the early 1900s, with substantial Edwardian houses along the tree-lined roads to the east and inter-war housing filling the rest. Plots are large, the houses are detached, and the neighbouring Moor Park estate raises the ceiling on what owners will invest.
The projects here are among the largest we do outside central London: double-storey rear extensions, full refurbishments with new services and layouts, new kitchens and bathrooms throughout, and loft conversions within the deep hipped roofs.
The Northwood Frithwood and Green Lane conservation areas cover parts of the district; most streets are unrestricted.
London Borough of Hillingdon
Hillingdon decides applications. Large plots mean most single-storey extensions are permitted development, while double-storey schemes need a householder application.
Conservation areas
In the Frithwood and Green Lane areas, external changes are assessed against the conservation area appraisal, with attention to trees and boundary treatments.
Moor Park
On the Moor Park estate, the residents' association has its own covenants and approval process alongside planning.
Approvals for house extensions in Northwood.
Many single-storey rear extensions are permitted development within the 3 or 4 metre limits, or 6 and 8 metres under prior approval. Conservation areas, flats, listed buildings and larger schemes need a householder application, and every extension needs building regulations approval.
Hillingdon decides applications. Large plots mean most single-storey extensions are permitted development, while double-storey schemes need a householder application.
What house extensions in Northwood includes.
- Architectural and structural design
- Planning or lawful development certificate
- Foundations, walls, roof and steels
- Glazing, rooflights and doors
- Kitchen designed and fitted
- Building control and party wall handled
From site visit to handover.
- 01
Site visit & consultation
We visit, listen and measure. Brief, budget and constraints understood before any advice is given.
- 02
Design & itemised quote
Our architects and engineers draw the scheme, and from that we provide a transparent, itemised quotation for your approval.
- 03
Planning & approvals
Planning applications, building control and party wall matters handled for you.
- 04
Build, managed weekly
Our own trades, sequenced by a site manager. Progress reported every week.
- 05
Handover & aftercare
Joint snagging walk-through, documentation, and a guarantee on our workmanship.
House Extensions in Northwood: your questions.
Do I need planning permission for an extension in Northwood?
Not always. Permitted development covers many single-storey rear extensions on houses, but the London Borough of Hillingdon removes those rights in some conservation areas, and flats and listed buildings always need an application. We confirm the route at the site visit.
How long does an extension take to build?
Ten to sixteen weeks on site for a single-storey extension once approvals are in place, plus the design and approval period beforehand. Glazing has the longest lead time, so we order it early.
Which parts of Northwood do you cover?
All of Northwood and HA6, including Green Lane, Frithwood Avenue, Watford Road, Murray Road, Dene Road, Eastbury Road, and the neighbouring districts. We are based in London and our teams work across central, north, north-west, west and south-west London.
Other services in Northwood.
House Refurbishment in Northwood
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Flat Refurbishment in Northwood
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Structural Alterations in Northwood
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Loft Conversions in Northwood
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Basement Conversions in Northwood
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Kitchen Renovation in Northwood
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Bathroom Renovation in Northwood
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Bespoke Joinery & Fitted Furniture in Northwood
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Architectural & Interior Design in Northwood
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Planning Permission & Building Regulations in Northwood
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We will visit, listen and explain what is possible for your property and how it would be approved. No pressure, no sales pitch.