31 Highfield Avenue Harpenden Hertfordshire Al5 5Ub

1. 20 Aug 2026

   Received by St Albans

2. 21 Aug 2026

   Validated

   Checked as complete and ready for consideration.

3. 25 Aug 2026

   Added to PlanIndex

4. 28 Aug 2026

   Decision issued: Certificate of Lawfulness Approved

Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.

Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

• 11 Highfield Avenue Harpenden Hertfordshire Al5 5Ub

  5/2016/2647 Submitted 23 Aug 2016 0m away

  Raising of and alterations to roof from hip to half hip roof form to create habitable loft accommodation with two rear dormer windows and rooflights and removal of one existing chimney

  Refused Householder Loft or dormer Windows or glazing 13 docs
  Domestic

• 31 Highfield Avenue Harpenden Hertfordshire Al5 5Ub

  5/2026/0140 Submitted 27 Jan 2026 0m away

  Proposed single-storey rear extension with rooflights, two-storey side extension and new rear roof dormer along with rooflights to the front. New front porch and internal alterations following demolition to the existing detached garage

  Withdrawn Extension Loft or dormer +1 11 docs
  Small domestic

• 31 Highfield Avenue Harpenden Hertfordshire Al5 5Ub

  5/2026/1324 Submitted 8 Jul 2026 0m away

  Certificate of Lawfulness (proposed) - Proposed rear single-storey extension, side single-storey extension, removal of rear chimney stack and replacement porch

  Refused Lawful development Extension 9 docs
  Small domestic

• 81 Topstreet Way Harpenden Hertfordshire Al5 5Ty

  5/2017/2594 Submitted 17 Sep 2017 132m away

  Hip to half-hipped roof extensions, loft conversion with rear dormer window and insertion of openings

  Decided Householder Extension Loft or dormer +1 11 docs
  Domestic

• 46 Chesterton Avenue Harpenden Hertfordshire Al5 5Su

  5/2026/1016 Submitted 22 May 2026 137m away

  New porch and conservatory

  Decided Householder Extension 10 docs
  Small domestic

• 37 Alzey Gardens Harpenden Hertfordshire Al5 5Sx

  5/2026/0542 Submitted 19 Mar 2026 147m away

  Proposed single storey rear and two storey side extensions, loft conversion with rear dormer, front rooflights, change to render and timber cladding, demolition of existing conservatory and garage, remodelling of roof and increase in ridge height and fron

  Decided Householder Extension Loft or dormer +2 14 docs
  Small domestic

• 5/2026/1607 Decided

  5 Flavian Close St Albans Hertfordshire Al3 4Jx

  Certificate of Lawfulness (proposed) - Construction of single storey rear extension with tiled lean to roof fitted with 3no. roof lights

  1 Sep 2026 Lawful development
• 5/2026/0951 Refused

  23 Clarence Road St Albans Hertfordshire Al1 4Np

  Certificate of Lawfulness (proposed) - New single storey garden room and close boarded access gates

  15 May 2026 Lawful development
• 5/2026/0291 Refused

  66 Pondfield Crescent St Albans Hertfordshire Al4 9Pf

  Certificate of Lawfulness (proposed) - Hip to gable and new dormer

  16 Feb 2026 Lawful development
• 5/2026/1252 Refused

  7 Palfrey Close St Albans Hertfordshire Al3 5Re

  Certificate of Lawfulness (proposed) - Single storey/ground floor extension to dining room, to extend as far as kitchen rear/outside wall across to party wall. Repositioning French windows to new rear of room, and repositioning downpipe and soak away in r

  30 Jun 2026 Lawful development
• 5/2026/1195 Granted

  87 How Wood Park Street St Albans Hertfordshire Al2 2Rw

  Certificate of Lawfulness (proposed) - Upgrade of existing garage buiding into insulated space to be used as summerhouse. Works comprise; Introducing insulation to floor, walls and roof, Replacing garage doors with crittal style glazed doors/windows, Add

  22 Jun 2026 Lawful development