19 Mentmore Road St Albans Hertfordshire Al1 2Bg

1. 22 Jun 2026

   Received by St Albans

2. 23 Jun 2026

   Validated

   Checked as complete and ready for consideration.

3. 24 Jul 2026

   Added to PlanIndex

4. 1 Aug 2026

   Status changed to Under Consideration

   Previously Under Consultation.

5. 17 Aug 2026

   Decision issued: Certificate of Lawfulness Approved

St Albans granted permission on 17 August 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. 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.

• 25 Mentmore Road St Albans Hertfordshire Al1 2Bg

  5/2026/1245 Submitted 25 Jun 2026 0m away

  Single storey rear extension 4m x in depth x 3.70m in height x 2.70m in height to the eaves

  Refused Prior approval Extension 5 docs
  Small domestic

• 25 Sadleir Road St Albans Hertfordshire Al1 2Bl

  5/2016/3063 Submitted 10 Oct 2016 82m away

  Certificate of Lawfulness (proposed) - construction of a single storey rear extension

  Granted Lawful development Extension 8 docs
  Small domestic

• 34 Boleyn Drive St Albans Hertfordshire Al1 2Bs

  5/2021/1507 Submitted 19 May 2021 109m away

  Single storey and first floor rear extensions and internal alterations

  Granted Householder Extension 9 docs
  Small domestic

• 12 Boleyn Drive St Albans Hertfordshire Al1 2Bs

  5/2026/0046 Submitted 9 Jan 2026 109m away

  Loft conversion with rear dormer window and front rooflights

  Decided Householder Loft or dormer Windows or glazing 16 docs
  Domestic

• 18 Leyland Avenue St Albans Hertfordshire Al1 2Be

  5/2026/0303 Submitted 17 Feb 2026 181m away

  Erection of two bedroom dwelling, along with the provision of vehicle parking, refuse/recycling and cycle stores, boundary treatments, and associated landscaping, installation of heat pump and solar panels and new vehicle crossover

  Decided 30 docs
  Domestic

• 18 Leyland Avenue St Albans Hertfordshire Al1 2Be

  5/2020/1796 Submitted 6 Aug 2020 181m away

  Hip to gable loft conversion with front rooflights and rear dormer window, single storey rear extension, front porch and dropped kerb (part retrospective)

  Granted Householder Extension Loft or dormer +1 23 docs
  Small domestic

• 5/2026/1277 Granted

  52 Napsbury Avenue London Colney Hertfordshire Al2 1Ls

  Certificate of Lawfulness (proposed) - The proposed development comprises building operations associated with the loft conversion of the existing roof space to provide additional habitable accommodation. The works include the construction of a rear dormer

  1 Jul 2026 Lawful development
• 5/2026/1366 Granted

  256 Sandridge Road St Albans Hertfordshire Al1 4Aj

  Certificate of Lawfulness (proposed) - Loft conversion with rear dormer & 4 velux to front

  14 Jul 2026 Lawful development
• 5/2026/1638 Decided

  1 Castle Rise Wheathampstead Hertfordshire Al4 8Hx

  Certificate of Lawfulness (proposed) - Proposed loft hip to gable with rear dormer, internal alterations and all associated works at 1 Castle Rise, AL4 8HX

  7 Sep 2026 Lawful development
• 5/2026/1621 Decided

  9 Ashley Gardens Harpenden Hertfordshire Al5 3En

  Certificate of Lawfulness (proposed) - Erection of a fence within boundary of the property

  2 Sep 2026 Lawful development
• 5/2026/1622 Decided

  9 Necton Road Wheathampstead Hertfordshire Al4 8At

  Certificate of Lawfulness (proposed) - Dormer to rear elevation to existing bedroom. new window to rear

  2 Sep 2026 Lawful development