21 Mallet Drive, Northolt, UB5 4BE

1. 28 Nov 2008

   Received by Harrow

2. 1 Dec 2008

   Validated

   Checked as complete and ready for consideration.

3. 23 Jan 2009

   Decision issued: REF

4. 23 Sep 2026

   Added to PlanIndex

Harrow has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• 9 Mallet Drive, Northolt, Harrow, UB5 4BE

  PL/0969/25 Submitted 7 Apr 2025 50 yards away

  Certificate of Lawful Proposed Development: Alterations to roof to form rear dormer; installation of two roof lights in front roof slope.

  Granted Lawful development Loft or dormer

• 20 Mallet Drive, Northolt, Harrow, UB5 4BE

  PL/2463/25 Submitted 22 Sep 2025 50 yards away

  Conversion of Semi-Detached dwelling into Two Separate Dwellings (1x2 bed and 1x3 bed); provision of cycle parking and bin storage, subdivision of amenity space including new front porch to No. 20A and creation of a crossover

  Refused Full applications New dwelling Extension
  Small domestic

• 20 Martin Drive, Northolt, UB5 4BG

  P/72/06/DFU Submitted 10 Jan 2006 50 yards away

  Alterations single storey rear extension and conversion to two self-contained flats

  Granted Full applications New dwelling Extension 28 docs
  Small domestic

• 10 Martin Drive, Northolt, UB5 4BG

  P/1210/18 Submitted 22 Mar 2018 50 yards away

  Certificate of lawful development (proposed): single storey rear extension

  Granted Lawful development Extension 9 docs
  Small domestic

• 10 Martin Drive, Northolt, Harrow, UB5 4BG

  P/0512/18 Submitted 6 Feb 2018 50 yards away

  CERTIFICATE OF LAWFUL PROPOSED DEVELOPMENT: Single storey rear extension

  Withdrawn Lawful development Extension 5 docs
  Small domestic

• 10 Martin Drive, Northolt, UB5 4BG

  P/5083/17/PRIOR Submitted 8 Nov 2017 50 yards away

  Single storey rear extension: extending 6 metres beyond the original rear wall 3 metres maximum height 3 metres high to the eaves

  Decided Householder Extension 16 docs
  Small domestic

• PL/1761/26 Status unknown

  1 Middle Road, Harrow On The Hill, Harrow, HA2 0HW

  Certificate of lawful development (proposed): Replacement of ground floor front bay window

  Received 29 Jun, published by the council 12 Aug 2026 Lawful development
• PL/1772/26 Status unknown

  114 Somervell Road, South Harrow, Harrow, HA2 8TT

  Certificate of Lawful Proposed Development: Demolition and replacement of first floor level and roof

  Received 29 Jun, published by the council 12 Aug 2026 Lawful development
• PL/1735/26 Status unknown

  222 Malvern Avenue, South Harrow, Harrow, HA2 9HE

  Certificate of lawful development (proposed): Rear dormer; installation of rooflight in front roofslope

  Received 24 Jun, published by the council 12 Aug 2026 Lawful development
• PL/1716/26 Status unknown

  59 Leamington Crescent, South Harrow, Harrow, HA2 9HH

  Certificate of Lawful Development (Proposed): Garden room with garden tools storage at rear (demolition of detached garage)

  Received 22 Jun, published by the council 12 Aug 2026 Lawful development
• PL/1696/26 Status unknown

  31 Chandos Road, Harrow, HA1 4QX

  Certificate of Lawful Development (Proposed): Alterations and extension to roof to form end gable; rear dormer; two rooflights in front roof slope; window in end gable

  Received 22 Jun, published by the council 12 Aug 2026 Lawful development