House Extensions in Harrow, HA1
Rear, side-return, wraparound and double-storey extensions for houses in Harrow, 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 Harrow.
An extension is the surest way to get the open-plan kitchen and dining room most families want, and the houses in Harrow 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 Harrow 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
- Harrow, HA1 · HA2
- Council
- London Borough of Harrow
- Housing
- 1930s semi-detached and detached houses, Victorian and Edwardian houses on the Hill, inter-war terraces around Rayners Lane and North Harrow
- Transport
- Harrow-on-the-Hill (Metropolitan), Rayners Lane, North Harrow
- 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
Harrow: the houses and the planning rules.
Harrow is Metroland: the streets around Harrow-on-the-Hill, North Harrow and Rayners Lane were built between the wars for commuters on the Metropolitan line, with generous semi-detached houses on plots that suit rear extensions and loft conversions. On the Hill itself, the village around the school is older, with Victorian and Georgian houses inside a conservation area.
It is one of our busiest areas. We have built a rear extension with bi-fold doors and a new kitchen in Rayners Lane, a loft and six-metre rear extension in Harrow on the Hill, refurbished a house in North Harrow, and fitted out cafés in St George's shopping centre and at the bus station.
The Harrow on the Hill Village and Roxeth Hill conservation areas cover the Hill; most of the borough is unrestricted.
London Borough of Harrow
Harrow decides applications. Outside the Hill's conservation areas, most rear extensions and loft conversions fall within permitted development, subject to the usual size limits.
Permitted development
Single-storey rear extensions up to 3 metres, or 6 metres with prior approval, and rear dormers within 50 cubic metres are typical. A lawful development certificate is worth obtaining for resale.
Harrow on the Hill
Within the village conservation area, extensions and roof changes need a planning application and matching materials.
Approvals for house extensions in Harrow.
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.
Harrow decides applications. Outside the Hill's conservation areas, most rear extensions and loft conversions fall within permitted development, subject to the usual size limits.
What house extensions in Harrow 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 Harrow: your questions.
Do I need planning permission for an extension in Harrow?
Not always. Permitted development covers many single-storey rear extensions on houses, but the London Borough of Harrow 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 Harrow do you cover?
All of Harrow and HA1 · HA2, including Rayners Lane, Pinner Road, Harrow View, Roxeth Hill, High Street, Harrow on the Hill, Station Road, and the neighbouring districts. We are based in London and our teams work across central, north, north-west, west and south-west London.
Our work near Harrow.
Other services in Harrow.
House Refurbishment in Harrow
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Flat Refurbishment in Harrow
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Structural Alterations in Harrow
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Loft Conversions in Harrow
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Basement Conversions in Harrow
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Kitchen Renovation in Harrow
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Bathroom Renovation in Harrow
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Bespoke Joinery & Fitted Furniture in Harrow
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Architectural & Interior Design in Harrow
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Planning Permission & Building Regulations in Harrow
Read moreHouse Extensions across London.
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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.