18 Rosebery Avenue Harpenden Hertfordshire Al5 2Qp

1. 24 Mar 2021

   Received by St Albans

2. 25 Mar 2021

   Validated

   Checked as complete and ready for consideration.

3. 17 Jun 2021

   Decision issued: DC3 Conditional Permission

4. 21 Aug 2026

   Added to PlanIndex

The council has decided this application; the published outcome sits in the record above and the decision notice on the council portal carries the detail, including any conditions.

If permission was granted, work must normally begin within three years of the decision. If it was refused, the applicant can appeal within the statutory time limit or submit a revised scheme.

Householder applications cover work to an existing house and its garden: extensions, loft and garage conversions, porches, outbuildings and similar alterations within the boundary of the home. They cannot be used to create a separate dwelling or change what the building is used for. Councils aim to decide them within eight weeks, and immediate neighbours are usually notified and given a chance to comment.

More on householder applications in our guide

• 6A Rosebery Avenue Harpenden Hertfordshire Al5 2Qp

  TP/2026/0185 Submitted 22 Apr 2026 0m away

  T1 Himalayan Birch to fell and grind. T2 Leylandii Conifer to reduce in height by 30% (approx. 5m)

  Granted Trees 2 docs

• 11A Salisbury Avenue Harpenden Hertfordshire Al5 2Qf

  TP/2026/0141 Submitted 19 Mar 2026 47m away

  Maintenance of front hedge boundary between 11A Salisbury Avenue and 12 Kirkwick Avenue. Works: T1 - Lawson cypress reduce inline with existing laurel hedge c. 6???6??? see image 1 and 2 T2 - Beech reduce inline with existing laurel hedge c. 6???6??? see

  Granted Trees 5 docs

• 17 Salisbury Avenue Harpenden Hertfordshire Al5 2Qf

  TP/2021/0089 Submitted 25 Feb 2021 47m away

  T1 Cherry (extensive decay in stem) - Fell

  Granted Trees 3 docs

• 17 Salisbury Avenue Harpenden Hertfordshire Al5 2Qf

  TP/2021/0276 Submitted 11 May 2021 47m away

  Front garden T1 Prunus (Cherry Tree) - Remove due to extensive decay in stem

  Granted Trees 3 docs

• 9 Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2021/1575 Submitted 24 May 2021 62m 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)

  Decided Householder Extension Loft or dormer 16 docs
  Small domestic

• 11 Rosebery Avenue Harpenden Hertfordshire Al5 2Qt

  5/2025/2322 Submitted 22 Dec 2025 62m away

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

  Decided Householder Extension 28 docs
  Domestic

• 5/2026/1173 Decided

  6 Longacres St Albans Hertfordshire Al4 0Dr

  Demolition of existing outbuilding and construction of single storey rear extension

  18 Jun 2026 Householder
• 5/2026/0299 Decided

  12 Rowlatt Drive St Albans Hertfordshire Al3 4Nb

  Demolition of existing side and rear extension and construction of a canopy porch, part single, part two storey front, two storey side and single storey rear extension

  17 Feb 2026 Householder
• 5/2026/0318 Refused

  7 Ardens Way St Albans Hertfordshire Al4 9Uw

  Demolition of existing side canopy, detached garage, rear patio and garden shed and the construction of two storey front, side and rear extensions, together with part single storey rear extension and a front porch canopy and extension to driveway

  19 Feb 2026 Householder
• 5/2026/1139 Decided

  50 Fontmell Close St Albans Hertfordshire Al3 5Hu

  Single storey rear extension and side windows with top openers over 1.7m high

  10 Jun 2026 Householder
• 5/2026/0525 Decided

  11 Hillside Road Harpenden Hertfordshire Al5 4Bs

  Garage conversion, with part roof extension and new front porch extension

  17 Mar 2026 Householder