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4 Rothamsted Avenue Harpenden Hertfordshire AL5 2DB

5/2026/0519FullApproved

Approved on 1 July 2026

Council decision: DC3 Conditional Permission3 conditions

Approximate location: the centre of the postcode, not the exact property.

Proposal

Lantern rooflight over existing flat roof, insertion of rooflights into existing pitched roof slope, conversion of attached external storage outbuilding to habitable accommodation, minor alterations to windows and doors to suit internal reconfiguration at 4 Rothamsted Avenue Harpenden Hertfordshire AL5 2DB

Submitted
16 March 2026
Ward
Harpenden West
Agent
Lingwood Design
  1. Received16 Mar
  2. Validated
  3. Consult.
  4. Target
  5. Decided1 Jul

Decided in 107 days (council typically 56)

About this application

This is a full planning application for an outbuilding at 4 Rothamsted Avenue Harpenden Hertfordshire AL5 2DB. St Albans has handled 3,966 applications of this type. This one was decided in 107 days, 7 weeks longer than St Albans's typical decision time. The site is in the Harpenden conservation area, with 1 listed building nearby. There are no previous applications recorded at this address. In the past year there have been 194 applications across Harpenden West. We hold 3,774 applications in total for the AL5 postcode area.

86% of full applications at St Albans City and District Council were approved. Across all application types, the council typically decides in about 8 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Application details

Postcode
AL5 2DB
Application type
Full
Scale / size
Small

Planning application dates

Consultation expiry
9 May 2026

Applicant and agent

Applicant
Private applicant
Agent
Lingwood Design
Architect profile
LINGWOOD DESIGN ARCHITECTS LIMITED

Site constraints

Checking the site
2/3
Council recordsAppealsFlood risk

Designations at the address point. Ones next to the site may also apply.

  • Conservation area: Harpenden
  • Flood zone 1: Low probability (rivers and sea)
Also checked, none recorded (23)

flood storage areas, listed buildings, Article 4 directions, tree preservation orders, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves, heritage coasts and brownfield registers.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

© Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right 2026.

© Environment Agency copyright and/or database right 2026. All rights reserved. Flood Map for Planning, Open Government Licence v3.0.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Source: St Albans

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