Areas / Hillingdon

Architects in Hillingdon

Hillingdon's suburban semis and detached houses in Ruislip, Ickenham, Uxbridge and Hayes often have room for larger extensions, subject to the borough's design guidance.

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

Request a fee proposal Check your postcode

Extended semi-detached house in Ruislip at dusk — 55 Long Drive, Ruislip · 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 Hillingdon

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

Householder extensions are assessed against Local Plan Part 2 policy DMHD 1, Alterations and Extensions to Residential Dwellings (adopted January 2020).
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Converting a house into flats needs an original internal floor area of at least 120 sq m, one unit per floor, and no more than 10% of a street converted (policy DMH 4).
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A borough-wide Article 4 direction has required planning permission for small HMOs since 11 December 2025.
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Additional HMO licensing for smaller HMOs started in August 2026, with a fee of £1,401 for a five-year licence.
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Hillingdon has 31 conservation areas.
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Postcodes

Hillingdon by postcode

6,184 postcodes in 11 postcode districts, 9 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.

Postcode checker