45 Thornham Avenue St Helens WA9 5AL

1. 6 May 2021

   Received by St. Helens

2. 1 Jul 2021

   Decision issued: Grant

3. 15 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

• 132 Marshalls Cross Road St Helens WA9 3DD

  P/2023/0547/HHFP Submitted 25 Sep 2023 68m away

  Single storey side extension and porch to front with extension to existing bay canopy to the front.

  Granted Householder Extension 6 docs
  Small domestic

• 132 Marshalls Cross Road St Helens WA9 3DD

  P/2021/0215/HHFP Submitted 26 Feb 2021 70m away

  Proposed dropped kerb onto a classified road

  Granted Householder 7 docs
  Small domestic

• 132 Marshalls Cross Road St Helens WA9 3DD

  P/2023/0550/HHPA Submitted 27 Sep 2023 71m away

  Prior approval for single storey rear extension projecting 4.50m from the rear, 3.59m overall height and 2.20m at the eaves.

  Decided Prior approval Extension 5 docs
  Small domestic

• 19 Tall Trees St Helens Merseyside WA9 5GH

  P/2022/0397/HHFP Submitted 15 Jun 2022 101m away

  Erection of a detached garden room and store in rear garden.

  Granted Householder 6 docs
  Small domestic

• 3 Walnut Grove St Helens WA9 5GQ

  P/2021/0956/CLP Submitted 26 Oct 2021 121m away

  Certificate of lawfulness for proposed partial garage conversion

  Granted Lawful development 6 docs

• 5 Tall Trees St Helens Merseyside WA9 5GH

  P/2021/0733/HHFP Submitted 3 Aug 2021 131m away

  Two storey side extension and single storey rear extension

  Granted Householder Extension 8 docs
  Small domestic

• P/2026/0441/CLP Awaiting decision

  108 New Street St Helens WA9 3XG

  Certificate of lawfulness for proposed change of use from C3 (dwellinghouse) to C4 (6-person HMO).

  1 Sep 2026 Lawful development
• P/2026/0444/CLP Awaiting decision

  19 Tracy Drive Newton Le Willows St Helens WA12 8PX

  Single storey side and rear extensions and garage conversion.

  29 Aug 2026 Lawful development
• P/2026/0439/CLP Awaiting decision

  87 Edge Street Thatto Heath St Helens WA9 5JX

  Certificate of lawfulness for a proposed change of use from dwellinghouse (C3) to childrens home (C2) for 1 child

  28 Aug 2026 Lawful development
• P/2026/0438/CLP Awaiting decision

  9 Chirton Close Haydock St Helens WA11 0FG

  Single storey rear extension and garage conversion.

  27 Aug 2026 Lawful development
• P/2026/0421/CLP Awaiting decision

  255 Marshalls Cross Road St Helens Merseyside WA9 3DE

  Certificate of lawfulness for proposed change of use from Dwellinghouse (Use Class C3) to a 6-person HMO (Use Class C4), including rear dormer and front rooflight.

  20 Aug 2026 Lawful development