128 Thirlmere Drive St Albans Hertfordshire Al1 5Ql

1. 7 Apr 2026

   Received by St Albans

2. 8 Apr 2026

   Validated

   Checked as complete and ready for consideration.

3. 7 Jul 2026

   Decision issued: Certificate of Lawfulness Approved

4. 7 Sep 2026

   Added to PlanIndex

St Albans granted permission on 7 July 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.

• 43 Burnside St Albans Hertfordshire Al1 5Rt

  5/2016/3459 Submitted 21 Nov 2016 50 yards away

  Certificate of Lawfulness (proposed) - Rear dormer window and rooflights to front elevation

  Granted Lawful development Loft or dormer Windows or glazing 8 docs

• 6 Grasmere Road St Albans Hertfordshire Al1 5Py

  5/2021/1699 Submitted 7 Jun 2021 100 yards away

  Certificate of Lawfulness (proposed) - Outbuilding

  Granted Lawful development 7 docs

• 117 Cell Barnes Lane St Albans Hertfordshire Al1 5Pu

  5/2021/1554 Submitted 23 May 2021 150 yards away

  Prior Notification - Single storey rear extension 2.9m in height x 5.5m in depth and 2.9m in height to the eaves

  Granted Prior approval Extension 10 docs
  Small domestic

• 56 Windermere Avenue St Albans Hertfordshire Al1 5Qn

  5/2017/3266 Submitted 20 Nov 2017 150 yards away

  Single storey rear extension (retrospective)

  Granted Householder Extension 11 docs
  Small domestic

• 56 Windermere Avenue St Albans Hertfordshire Al1 5Qn

  5/2021/1472 Submitted 17 May 2021 150 yards away

  First floor rear extension - retrospective (resubmission following refusal of 5/2020/1327)

  Granted Householder Extension 10 docs
  Domestic

• 58 Windermere Avenue St Albans Hertfordshire Al1 5Qn

  5/2026/1056 Submitted 1 Jun 2026 150 yards away

  89% historically approved · decision due ~28 Jul

  First floor rear extension

  Awaiting decision Householder Extension 18 docs
  Domestic

• 5/2026/1638 Granted

  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

  Received 7 Sep, published by the council 13 Sep 2026 Lawful development
• 5/2026/1622 Granted

  9 Necton Road Wheathampstead Hertfordshire Al4 8At

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

  Received 2 Sep, published by the council 13 Sep 2026 Lawful development
• 5/2026/1561 Granted

  125 New House Park St Albans Hertfordshire Al1 1Uh

  Certificate of Lawfulness (existing) - The retrospective development comprises minor external alterations to the rear elevation of the dwellinghouse at 125 New House Park. The applicant seeks a Certificate of Lawfulness (Existing) under Section 191 of the

  Received 21 Aug, published by the council 31 Aug 2026 Lawful development
• 5/2026/1772 Awaiting decision

  14 Ashley Road St Albans Hertfordshire Al1 5Da

  Certificate of Lawfulness (Proposed) - Loft Conversion, Hip to gable, Rear dormer

  Received 29 Sep, published by the council 11 Oct 2026 Lawful development
• 5/2026/1759 Awaiting decision

  2 Grimston Road St Albans Hertfordshire Al1 5Ep

  Certificate of Lawfulness (Proposed) - Erection of a single-storey detached timber log cabin with a pent (mono-pitch) roof in the rear garden, for purposes incidental to the enjoyment of the dwellinghouse (domestic storage and hobby workshop). Footprint 9

  Received 28 Sep, published by the council 11 Oct 2026 Lawful development