23 Cowper Street Olney MK46 4BW

1. 18 Apr 2023

   Received by Milton Keynes

2. 20 Apr 2023

   Validated

   Checked as complete and ready for consideration.

3. 15 Jun 2023

   Decision issued: Approved

4. 1 Sep 2026

   Added to PlanIndex

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

• 23 Cowper Street Olney MK46 4BW

  23/00932/HOU Submitted 18 Apr 2023 0m away

  The erection of a single storey rear extension, a pitched roof over existing singe storey flat roof extension and a glass canopy

  Granted Householder Extension 8 docs
  Small domestic

• 8 Cowper Street Olney MK46 4BW

  20/00078/FUL Submitted 14 Jan 2020 20m away

  Single storey rear extension

  Granted Full applications Extension 6 docs
  Small domestic

• 24 Midland Road Olney MK46 4BL

  19/02801/FUL Submitted 24 Oct 2019 85m away

  Rear single storey flat roof extension with associated alteration works.

  Granted Full applications Extension 8 docs
  Small domestic

• 43 WELLINGBOROUGH ROAD, OLNEY, MK46 4BJ

  PLN/2025/1820 Submitted 2 Sep 2025 104m away

  The erection of a single storey side extension with roof lights and loft conversion including roof lights to front and rear roof slopes

  Granted Householder Extension Loft or dormer 6 docs
  Small domestic

• 47 Midland Road Olney MK46 4BP

  19/03334/NMA Submitted 12 Dec 2019 112m away

  Non material amendment to application 19/00857/FUL to amend floor and roof plans

  Granted Amendments 8 docs

• Land To South of Lavendon Road Farm Lavendon Road Olney

  19/03143/DISCON Submitted 25 Nov 2019 154m away

  Details submitted pursuant of condition 11 (Hard and soft landscaping works scheme) attached to planning application 19/01345/REM

  Decided Conditions 12 docs

• PLN/2026/1586 Withdrawn

  4 BROMHAM MILL, GIFFARD PARK, MILTON KEYNES, MK14 5QP

  Certificate of lawfulness for the proposed garage conversion and side extension

  29 Jul 2026 Lawful development
• PLN/2026/1370 Refused

  15 CASTLE ROSE, WOUGHTON PARK, MILTON KEYNES, MK6 3BQ

  Certificate of lawfulness for the proposed construction of a low brick wall with railings (1.5 m overall), brick piers, sliding gate set 5 m from road, and pedestrian gate within domestic curtilage

  29 Jun 2026 Lawful development
• PLN/2026/1393 Refused

  2 GREATCHESTERS, BANCROFT, MILTON KEYNES, MK13 0PA

  Certificate of lawfulness for the proposed demolition of existing conservatory, erection of a new rear extension, infill the space under the carport and loft conversion with a rear dormer

  2 Jul 2026 Lawful development
• PLN/2026/1741 Awaiting decision

  5 Spring Mews, Sherington, MK16 9FT

  Certificate of lawfulness for the existing detached rear outbuilding for use as a garden studio

  18 Aug 2026 Lawful development
• PLN/2026/1170 Granted

  61 WINDSOR STREET, BLETCHLEY, MILTON KEYNES, MK2 2LN

  Certificate of lawfulness for proposed loft conversion with rear and side dormer extension and rooflights to front roof slope

  2 Jun 2026 Lawful development