Flats 2 and 4 15 Thornbury Avenue Southampton SO15 5BQ

1. 7 Aug 2024

   Received by Southampton

2. 29 Nov 2024

   Decision issued: Grant (LDC)

3. 20 Aug 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

• 39 Thornbury Avenue Southampton SO15 5BQ

  26/00312/FUL Submitted 17 Apr 2026 0m away

  Change of use from Residential Dwelling (Class C3) to Hotel (Class C1)

  Refused Full applications 6 docs
  Domestic

• 4 Thornbury Avenue Southampton SO15 5BR

  26/00877/ELDC Submitted 13 Aug 2026 42m away

  90% historically approved · decision due ~8 Oct

  Application for a lawful development certificate for the existing use as a house in multiple occupation (HMO, Class C4).

  Awaiting decision

• 2A Thornbury Avenue Southampton City Of Southampton SO15 5BR

  22/00584/ELDC Submitted 13 Apr 2022 42m away

  Application for a lawful development certificate for existing use as a sui generis house in multiple occupation (HMO) for 8 persons.

  Granted Lawful development 5 docs

• 2B Thornbury Avenue Southampton City Of Southampton SO15 5BR

  23/00503/ELDC Submitted 19 Apr 2023 42m away

  95% historically approved · decision due ~14 Jun

  Application for a lawful development certificate for existing use as a sui generis house in multiple occupation (HMO) for 7 persons.

  Awaiting decision Lawful development 2 docs

• 52 Atherley Road Southampton SO15 5DS

  25/00134/FUL Submitted 12 Aug 2025 65m away

  Conversion of existing 9-bedroom hostel into 4 flats (1 x 3-bedroom, 3 x 1-bedroom) with associated amenities.

  Granted Full applications New dwelling 13 docs
  Several homes

• 36 Thornbury Avenue Southampton SO15 5BR

  21/01071/FUL Submitted 14 Jul 2021 74m away

  Removal of condition 3 sought to remove the personal restriction of the business and variation of condition 4 sought to increase staff members on planning permission ref. 05/00382/FUL.

  Granted Full applications 7 docs

• 26/00535/ELDC Granted

  20 Craven Street Southampton SO14 1AX

  Application for a lawful development certificate for the existing use as a house in multiple occupation (HMO, Class C4).

  8 May 2026 Lawful development
• 26/00287/ELDC Granted

  Ground Floor Flat 17A Alma Road Southampton SO14 6UN

  Application for a lawful development certificate for the existing use as a house in multiple occupation (HMO, Class C4).

  13 Mar 2026 Lawful development
• 26/00650/PLDC Refused

  158 Millbrook Road East Southampton SO15 1JR

  Application for a lawful development certificate for proposed use as offices (use class E).

  4 Jun 2026 Lawful development
• 26/00626/ELDC Granted

  82 Newcombe Road Southampton SO15 2FS

  Application for a lawful development certificate for the existing use as a house in multiple occupation (HMO, Class C4).

  29 May 2026 Lawful development
• 26/00647/ELDC Granted

  18 Howard Road Southampton SO15 5BN

  Application for a lawful development certificate for the existing use as a 7-bedroom house in multiple occupation (HMO, Sui Generis)

  3 Jun 2026 Lawful development