9B Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

1. 3 Mar 2026

   Received by St Albans

2. 4 Mar 2026

   Validated

   Checked as complete and ready for consideration.

3. 27 Sep 2026

   Added to PlanIndex

4. Decision

   Awaiting decision

   Decision expected by 29 April 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.

   St Albans took a median of 76 days over the applications it decided in the last year.

This application is with St Albans for determination, against a statutory target of eight weeks. Over the last year St Albans decided lawful development applications in a median of 71 days. More in our guide to how long planning decisions take.

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.

• 9 Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2021/1575 Submitted 24 May 2021 50 yards away

  Erection of part two storey side extension and part single storey rear extension, with installation of rear dormer (resubmission following withdrawal of 5/2021/0488)

  Granted Householder Extension Loft or dormer 16 docs
  Small domestic

• 9A Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2025/1661 Submitted 8 Sep 2025 50 yards away

  96% historically approved · decision due ~3 Dec

  Discharge of Condition 15 (bio diversity net gain) of planning permission 5/2024/2258 dated 01/09/2025 for Demolition of existing semi-detached duplex properties and construction of two, three bedroom semi-detached houses with attic accommodation with as

  Awaiting decision Conditions Demolition 4 docs

• 11 Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2021/1515 Submitted 20 May 2021 50 yards away

  Single storey side and rear extensions and internal alterations

  Granted Householder Extension 8 docs
  Small domestic

• 11 Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2025/2322 Submitted 22 Dec 2025 50 yards away

  Rear ground and basement floor extensions with associated hard and soft landscaping

  Granted Householder Extension 28 docs
  Domestic

• 9A Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2026/0407 Submitted 3 Mar 2026 50 yards away

  75% historically approved · decision due ~29 Apr

  Certificate of Lawfulness (proposed) - Erection of a single-storey detached outbuilding within the rear garden of the dwellinghouse

  Awaiting decision Lawful development 5 docs
  Small domestic

• 15 Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2017/3063 Submitted 26 Oct 2017 50 yards away

  Demolition of garage and outbuilding and erection of two storey side extension with accommodation in roofspace

  Granted Householder Extension Demolition 21 docs
  Small 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