51 Rosslyn Crescent, Harrow, HA1 2SA

1. 22 Apr 2024

   Received by Harrow

2. 2 Sep 2026

   Added to PlanIndex

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 75 Rosslyn Crescent, Harrow, HA1 2SA

  PL/1747/26 Submitted 26 Jun 2026 0m away

  Decision due ~21 Aug

  Single storey rear extension: 6.00 metres deep, 3.50 metres maximum height and 2.85 metres high to the eaves

  Status unknown Prior approval Extension
  Small domestic

• 28 Frognal Avenue, Harrow

  P/2000/18 Submitted 10 May 2018 57m away

  Certificate of lawful development (existing): use of dwellinghouse as two flats

  Granted Lawful development New dwelling
  Several homes

• 2 Frognal Avenue, Harrow, HA1 2SF

  PL/1937/25 Submitted 22 Jul 2025 57m away

  Decision due ~16 Sep

  Certificate of Lawful Development Existing: Change of use from a C3 single dwelling house to a C4 HMO comprising 6 bedrooms.

  Status unknown Lawful development
  Domestic

• 2 Frognal Avenue, Harrow, HA1 2SF

  P/0376/19 Submitted 28 Jan 2019 57m away

  Single storey rear extension

  Granted Householder Extension 13 docs
  Small domestic

• 2 Frognal Avenue, Harrow, HA1 2SF

  PL/3246/25 Submitted 15 Dec 2025 57m away

  Decision due ~9 Feb

  CERTIFICATE OF LAWFUL DEVELOPMENT (PROPOSED): Use of house of multiple occupancy (HMO) for up to 6 persons (Class C4) as HMO for up to 7 persons (Class C4)

  Status unknown Lawful development

• 2 Frognal Avenue, Harrow, HA1 2SF

  PL/2233/24 Submitted 12 Aug 2024 57m away

  Single story rear extension; external alterations (demolition of rear extension)

  Granted Householder Extension Demolition
  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

  29 Jun 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

  29 Jun 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

  24 Jun 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)

  22 Jun 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

  22 Jun 2026 Lawful development