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Planning application

The Mansion, Bletchley Park, Sherwood Drive, Bletchley, Milton Keynes, MK3 6EB

Granted Milton Keynes PLN/2026/0321 Listed building consent (alterations or extension)

Works: Windows or glazing

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Listed building consent for the repair and restoration of The Bletchley Park Mansion external fabric, including brick and stone replacements, full reroofing and lead repairs, overhaul of the rainwater goods to increase capacity, the structural repair of chimneys and flues, the restoration and redecoration of the timber and crittall windows, the removal of asbestos insulation in the roof voids and the replacement of the failed condemned mansafe system

As published by the council, reference PLN/2026/0321

Application record

Reference
PLN/2026/0321
Type
Listed building consent (alterations or extension)
Status
Decision Made
Decision
Granted As published: Approved with Conditions
Received
18 Feb 2026
Validated
18 Feb 2026
Decided
9 Apr 2026
Ward
Bletchley Park
Parish
West Bletchley
Decision by
Delegated Decision
Postcode
MK3 6EB

Site history

Applications at this address on the Milton Keynes register

This site has had 4 applications since 2019: 4 approved, 0 refused.

  • PLN/2026/1306 Granted

    THE MANSION, BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    The crown lift to 2m above ground over footpath of Cedar (T102) protected by Milton Keynes Council Tree Preservation Order no. PS/540/15/139 and the crown lift to 4m above ground along boundary by parking bays/kerbs and prune back by 2m from street lights of mixed trees in Group E protected by Milton Keynes Council Tree Preservation Order no. PS/540/15/136

    Decided 11 Aug 2026 Trees
  • PLN/2026/1191 Granted

    THE MANSION, BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    The crown lifting to 2m above ground level of Crab Apple (E) and Cherry trees (B, C & D), the crown reduction by 2m back from building of Willow (A), and the coppicing to ground level of self set trees and regrowth from old stump of Sycamores (G27)

    Decided 31 Jul 2026 Trees
  • 19/02549/FUL Granted

    The Mansion Bletchley Park Sherwood Drive Bletchley Milton Keynes MK3 6EB

    To install a temporary modular single story classroom block.

    Decided 12 Nov 2019 Full applications

Timeline

Dates from the published record

  1. 18 Feb 2026

    Received by Milton Keynes

  2. 9 Apr 2026

    Decision issued: Approved with Conditions

  3. 10 Aug 2026

    Added to PlanIndex

Documents

Plans, drawings, consultee responses and the officer's report

32 documents on file for this application

A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.

Watch members (£5 a month) open the document list from here.

Open the documents

What this grant of permission means

Milton Keynes granted permission on 9 April 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.

About heritage and listed building applications

Listed building consent is needed for works that affect the special interest of a listed building, and carrying out such works without it is a criminal offence. More in our guide to planning application types.

Nearby applications

Within 0.3 miles

  • BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    PLN/2026/1676 Submitted 6 Aug 2026 50 yards away

    95% historically approved · decision due ~5 Oct

    Listed building consent for extensions, alterations & revised access to Block B

    Awaiting decision Heritage and listed buildings Extension 16 docs

  • BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    PLN/2026/0471 Submitted 9 Mar 2026 50 yards away

    The crown reduction by 5m of 2x Blue Atlas Cedar (T74-75), and reduction to previous points (approx 5m) of Lime (T104), protected by Milton Keynes Council Tree Preservation Order no. PS/450/15/139

    Granted Trees 6 docs

  • BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    PLN/2026/1196 Submitted 3 Jun 2026 50 yards away

    To crown lift lower branches/limbs overhanging road to 3.5m above ground of 1x Copper Beech tree (T83) protected by Milton Keynes Council Tree Preservation Order PS/540/15/139

    Granted Trees 5 docs

  • BLETCHLEY PARK, WILTON AVENUE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    PLN/2026/1309 Submitted 19 Jun 2026 50 yards away

    The crown lift of secondary branches up to 25mm diameter to 2.5m above ground of Oak Tree (T29) protected by Milton Keynes Council Tree Preservation Order no. PS/540/15/139

    Granted Trees 5 docs

  • BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    PLN/2026/1368 Submitted 19 Jun 2026 50 yards away

    Listed building consent for installation of ASHP and associated equipment across two locations (The Mansion/Hut 4 and Block E) and the removal of the existing oil boilers and oil storage tanks

    Granted Heritage and listed buildings 25 docs

  • BLETCHLEY PARK, SHERWOOD DRIVE, BLETCHLEY, MILTON KEYNES, MK3 6EB

    PLN/2026/1307 Submitted 19 Jun 2026 50 yards away

    77% historically approved · decision due ~17 Aug

    Installation of ASHP and associated equipment across two locations (The Mansion/Hut 4 and Block E) and the removal of the existing oil boilers and oil storage tanks

    Awaiting decision Full applications 23 docs

In Milton Keynes

  • PLN/2026/1689 Granted

    LINCOLN LODGE, 23 SILVER STREET, NEWPORT PAGNELL, MK16 0EJ

    Listed building consent for the repair and stabilisation works to the existing brick garage outbuilding, including replacement of the existing roof covering and defective timber structure, localised brickwork repairs/rebuilding, timber frame repairs, replacement of defective garage doors, repair of the garden door and window, and replacement of rainwater goods

    Received 11 Aug, published by the council 22 Aug 2026 Heritage and listed buildings
  • PLN/2026/1526 Granted

    ROTHBURY, WATLING STREET, LITTLE BRICKHILL, MILTON KEYNES, MK17 9LU

    Listed building consent for the proposed attachment of a small box to the front elevation to allow broadband to be connected

    Received 20 Jul, published by the council 4 Aug 2026 Heritage and listed buildings
  • PLN/2026/1386 Granted

    EATON BEECHES, 29 HIGH STREET, STOKE GOLDINGTON, NEWPORT PAGNELL, MK16 8NP

    Listed Building Consent for a proposed single storey extension, including reinstated and new door openings into the extension, the maintenance and repair to external timberwork, gutters, window lintels, windows, stonework and pointing, replacement of timber windows to first floor bathrooms, a replacement front door, removal of buttress, replacement of render with lime mortar render, reinstallation of footpath, internal alterations to form a new ground floor WC, removal of one internal brick partition, removal of a contemporary floor, kitchen relocation, installation of fireplace and other associated alterations and repair of garden store building

    Received 25 Jun, published by the council 27 Jul 2026 Heritage and listed buildings
  • PLN/2026/1254 Granted

    THE CHEQUERS, 48 WATLING STREET, BLETCHLEY, MILTON KEYNES, MK2 2BY

    Listed building consent for the erection of a single storey rear extension to create toilet block, erection of lean-to roof between existing outbuilding and new extension, conversion of existing outbuilding and erection of timber shed

    Received 28 May, published by the council 4 Aug 2026 Heritage and listed buildings
  • PLN/2026/1376 Granted

    7 MARKET SQUARE, STONY STRATFORD, MILTON KEYNES, MK11 1BE

    Listed building consent for the proposed removal of the existing cement render from the front elevation and replaced with lime plaster

    Received 19 Jun, published by the council 22 Aug 2026 Heritage and listed buildings