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Permitted5/2021/1619Submitted 5 years agoSide extension

10 Cowper Road Harpenden Hertfordshire Al5 5Ng

Single storey side extension. Installation of rear rooflights and alterations to openings, windows and roof

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Map of the site

Progress

Submitted
31 May 2021
— completed
Validated
1 Jun 2021
— completed
Consultation
9 Jul 2021
— completed
Target date
9 Jul 2021
— completed
Decided
20 Jul 2021
— completed

Application details

Reference
5/2021/1619
Local authority
St Albans
Postcode
AL5 5NG
Ward
Harpenden West
Application type
Full
Property type
House

Key dates

Submitted
31 May 2021
Validated
1 Jun 2021
Target decision
9 Jul 2021
Decided
20 Jul 2021

8 documents · 0 comments · 0 constraints

Estimated project value

£29k–£69k

Typical UK cost for this job type, at South East rates (2026). Estimated from the proposal description — planning applications do not state build cost. Source: MyJobQuote / Checkatrade 2026 extension rates.

Recently sold nearby

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 2 recent sales are listed below.

Homes here go for about £968,000 — the median of the last 8 market sales in AL5 5NG, £509,000 to £1,300,000.

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.

Planning constraints

No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.

Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.

Nearby applications