21 Downage London Borough of Barnet NW4 1AS
Demolition of existing side garage; Part single, part two storey rear extension; Single storey side extension. Single storey front extension to accommodate a front porch; Alterations to both front bays to create squared features and retention of both pitched elements; Conversion of roofspace into habitable space and addition of rooflights to front and rear roofslopes; Single storey outbuilding to rear garden; New block paving and drainage soakaway to front amenity space; Alterations to front boundary to widen the access space (AMENDED DESCRIPTION)
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Progress
Application details
- Reference
- 21/0538/HSE
- Local authority
- Barnet
- Postcode
- NW4 1AS
- Ward
- HD
- Application type
- Householder
- Property type
- House
Key dates
- Submitted
- 2 Feb 2021
- Validated
- 2 Feb 2021
- Target decision
- 30 Mar 2021
- Decided
- 14 May 2021
Estimated project value
£265k–£370k
Based on the 98.0m² of floor area stated in the application, at inner London rates (2026). Source: FMB / Checkatrade 2026, two-storey extension £2,000-£2,800/m².
Floor area gained: 98m²
Recently sold nearby
Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts.
- 17 DOWNAGE, LONDON, NW4 1ASDetached · £2,200,00014 months ago1 Jul 2025
- 11 DOWNAGE, LONDON, NW4 1ASDetached · £1,485,0006 years ago11 Oct 2019
- 47 DOWNAGE, LONDON, NW4 1ASDetached · £1,650,00011 years ago26 Feb 2015
- 3 DOWNAGE, LONDON, NW4 1ASDetached · £1,800,00012 years ago2 Dec 2013
- 9 DOWNAGE, LONDON, NW4 1ASDetached · £1,350,00013 years ago18 Mar 2013
- 21 DOWNAGE, LONDON, NW4 1ASDetached · £1,190,00014 years ago19 Dec 2011
- 17 DOWNAGE, LONDON, NW4 1ASDetached · £999,95015 years ago15 Aug 2011
- 19 DOWNAGE, LONDON, NW4 1ASDetached · £1,120,00017 years ago17 Aug 2009
Homes here go for about £1,417,500 — the median of the last 8 market sales in NW4 1AS, £999,950 to £2,200,000.
Contains HM Land Registry data © Crown copyright and database right 2025. 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
- 17 Downage London Borough of Barnet NW4 1ASRefusedAdjoining
- 17 Downage London Borough of Barnet NW4 1ASPermittedAdjoining
- 17 Downage London Borough of Barnet NW4 1ASPermittedAdjoining
- 27 Downage London Borough of Barnet NW4 1ASPermitted45 yd
- 28 Downage London Borough of Barnet NW4 1AHRefused50 yd
- 28 Downage London Borough of Barnet NW4 1AHPermitted50 yd