42 Cowper Road Harpenden Hertfordshire Al5 5Ng

1. 14 Mar 2026

   Received by St Albans

2. 18 Mar 2026

   Validated

   Checked as complete and ready for consideration.

3. 12 May 2026

   Decision issued: Tree Works in Conservation Area - Deemed Consent

4. 24 Jul 2026

   Added to PlanIndex

St Albans granted permission on 12 May 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.

Applications for works to trees cover protected trees: consent under a tree preservation order, or six weeks notice for trees in a conservation area. More in our guide to planning application types.

• 22 Cowper Road Harpenden Hertfordshire Al5 5Ng

  5/2016/3616 Submitted 5 Dec 2016 50 yards away

  Rear infill extension

  Granted Householder Extension 22 docs
  Domestic

• 20 Cowper Road Harpenden Hertfordshire Al5 5Ng

  5/2016/3564 Submitted 30 Nov 2016 50 yards away

  Single storey side and rear extension, garage conversion to habitable room and alterations to openings

  Granted Householder Extension 15 docs
  Small domestic

• 26 Cowper Road Harpenden Hertfordshire Al5 5Ng

  5/2026/1464 Submitted 3 Aug 2026 50 yards away

  89% historically approved · decision due ~29 Sep

  Proposed extensions and alterations to 26 Cowper Road, comprising a first floor extension above the existing garage and utility room, including the conversion of the existing garage to provide an enlarged entrance hall, WC and storage, involving the remov

  Awaiting decision Householder Extension 13 docs
  Domestic

• 10 Cowper Road Harpenden Hertfordshire Al5 5Ng

  5/2021/1619 Submitted 31 May 2021 50 yards away

  Single storey side extension. Installation of rear rooflights and alterations to openings, windows and roof

  Granted Householder Extension Loft or dormer +1 8 docs
  Small domestic

• 21 Cowper Road Harpenden Hertfordshire Al5 5Nf

  5/2017/1754 Submitted 19 Jun 2017 50 yards away

  Part single, part two storey rear extension, replacement rear dormer window and alterations to openings

  Granted Householder Extension Loft or dormer +1 16 docs
  Domestic

• 31 Cowper Road Harpenden Hertfordshire Al5 5Nf

  5/2017/3061 Submitted 26 Oct 2017 50 yards away

  Single storey rear and first floor rear extension replacement ground floor and balcony roof

  Granted Householder Extension 9 docs
  Small domestic

• TP/2026/0283 Granted

  86 Marshalswick Lane St Albans Hertfordshire Al1 4Xe

  Lime - reduce height by 5m, lateral reduction of 4m and crown clean

  Received 3 Jun, published by the council 24 Jul 2026 Trees
• TP/2026/0509 Awaiting decision

  36 Park Avenue North Harpenden Hertfordshire Al5 2Ed

  G1 - 5 lime trees at the front of the house to raise the canopy to approx 5 mentres and remove epicormic growth. This work is all general maintenasnce and to keep mtrees healthy and under control

  Received 5 Oct, published by the council 11 Oct 2026 Trees
• TP/2026/0506 Awaiting decision

  Old Bell 177 Luton Road Harpenden Hertfordshire Al5 3Bn

  5 x Oaks to lift to around 3m above ground level, remove deadwood greater than 40mm in diameter. Lift canopies on all Oaks to allow better view of area due to safety concerns & recent damage

  Received 5 Oct, published by the council 11 Oct 2026 Trees
• TP/2026/0507 Awaiting decision

  10 Monks Close Redbourn Hertfordshire Al3 7Ly

  TPO1910 (G1) Silver Birch x2 Reduce the overall crown height by approximately 5 metres, Reduce lateral growth by approximately 0.5 metres where necessary to maintain a balanced and natural crown form. Reason for works: To reduce the overall size of

  Received 5 Oct, published by the council 11 Oct 2026 Trees
• TP/2026/0402 Granted

  28 West Common Way Harpenden Hertfordshire Al5 2Lg

  T1 - oak tree reduce north east side of Oak tree by 3m. This tree has been heavily cut on the opposite side of the tree leaving the tree hugely unbalanced.

  Received 20 Aug, published by the council 25 Aug 2026 Trees