Areas / Harrow

Architects in Harrow

Harrow's interwar semis and detached houses suit wrap-around extensions and hip-to-gable lofts, but the borough's design guidance and many conservation areas mean details matter.

RIBA Chartered Practice · ARB-registered architects · Extensions, lofts and planning drawings

Request a fee proposal Check your postcode

Front of a semi-detached house in Harrow at dusk — 16 Heath Road, Harrow · Designed within the Green Code group

FreeInitial consultationA conversation about your project, and a first view of what's possible, before any fee is agreed.
FixedFee for each stageEvery stage is priced in writing before it starts. No hourly billing.
3DSee the design firstYour design is shown in 3D before it's submitted, while changes are still easy.
FreeResubmissionIf planning is refused, we revise and resubmit at no extra design fee. Conditions

Local planning points

Planning in Harrow

Checked October 2026. Planning policy changes, so we confirm the position for your address before you commit.

The Residential Design Guide SPD (2010) sets no fixed depth for single-storey rear extensions that need permission. Extra depth is expected to be set in from the side boundary by twice that depth.
Source
Two-storey rear extensions must meet the 45-degree code and are generally not possible on mid-terraced houses.
Source
The Harrow Local Plan 2021–2041 was adopted on 24 March 2026, replacing the 2012 Core Strategy and 2013 development management policies.
Source
An immediate borough-wide Article 4 direction removed permitted development rights for small HMOs in June 2026. The council must decide by 11 December 2026 whether to confirm it.
Source
Harrow has 30 conservation areas.
Source

Postcodes

Harrow by postcode

4,948 postcodes in 6 postcode districts, 5 miles from our studio in Cricklewood.

Where a postcode district is shared, neighbouring streets can fall under a different council. The checker below gives the answer for an exact postcode.

1,863householder, lawful development and prior approval applications registered in Harrow since 1 October 2025

80%of those decided so far were approved (1,232 approved, 302 refused)

Council-wide figures from public planning records, not our own results. Every application is judged on its own merits.

Postcode checker

Which council decides your application?

Type any postcode in the 33 London boroughs we cover. We'll tell you which council handles planning there and show you the local planning points.

Local work

Our projects in Harrow

All projects

Services

What we draw in Harrow

All services

Neighbourhoods we cover include Harrow, Pinner, Stanmore, Wealdstone, Rayners Lane and Kenton.

Neighbouring councils: Barnet, Brent, Hillingdon, Ealing.