12 SIDNEY CLOSE, MIDDLETON, MILTON KEYNES, MK10 9TA

1. 30 Oct 2025

   Received by Milton Keynes

2. 10 Nov 2025

   Validated

   Checked as complete and ready for consideration.

3. 18 Dec 2025

   Decision issued: Approved

4. 10 Aug 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

• 10 SIDNEY CLOSE, MIDDLETON, MILTON KEYNES, MK10 9TA

  PLN/2026/0562 Submitted 17 Mar 2026 0m away

  Certificate of lawfulness for proposed single storey rear extension

  Refused Lawful development Extension 8 docs
  Small domestic

• 99 Noon Layer Drive Middleton Milton Keynes MK10 9SX

  19/03331/FUL Submitted 12 Dec 2019 40m away

  Single storey rear extension

  Granted Full applications Extension 6 docs
  Small domestic

• 5 Poyning Lane Middleton Milton Keynes MK10 9SZ

  22/02982/HOU Submitted 30 Nov 2022 98m away

  The erection of a single storey rear extension to provide an annexe

  Granted Householder Extension 10 docs
  Small domestic

• 5 Poyning Lane Middleton Milton Keynes MK10 9SZ

  19/02635/FUL Submitted 10 Oct 2019 98m away

  Single storey rear extension

  Withdrawn Full applications Extension 13 docs
  Small domestic

• 1 Poyning Lane Middleton Milton Keynes MK10 9SZ

  19/02541/FUL Submitted 3 Oct 2019 115m away

  Proposal for a single storey, rear extension to the existing, detached dwelling

  Granted Full applications New dwelling Extension 12 docs
  Small domestic

• 5 Powell Haven Middleton Milton Keynes MK10 9JT

  20/00416/FUL Submitted 17 Feb 2020 130m away

  Proposed single storey side extension and loft conversion with front and rear dormers

  Granted Full applications Extension Loft or dormer 5 docs
  Small domestic

• PLN/2026/1586 Withdrawn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