12 Birley Street SW11 5XF

1. 8 Jul 2026

   Received by Wandsworth

2. 25 Jul 2026

   Added to PlanIndex

3. 25 Aug 2026

   Decision issued: Approve with Conditions

Wandsworth granted permission on 25 August 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.

The published feed does not state which type of application this is; the register entry on Wandsworth's portal will say. Our guide explains the common types.

• 34 Birley Street SW11 5XF

  2026/1572 Submitted 20 May 2026 50 yards away

  Alteration including installation of replacement timber windows.

  Granted Windows or glazing

• 121 Tyneham Road SW11 5XG

  2025/2900 Submitted 14 Aug 2025 50 yards away

  Alterations including erection of a single storey side/rear extension.

  Granted Householder Extension 9 docs
  Small domestic

• 107 Tyneham Road SW11 5XG

  2025/3758 Submitted 20 Oct 2025 50 yards away

  Alterations including erection of roof extension to form additional floor of accommodation.

  Granted Householder Extension 10 docs
  Domestic

• 42 Birley Street SW11 5XF

  2025/2997 Submitted 27 Aug 2025 50 yards away

  Alterations including erection of mansard roof extension to main rear roof and single storey side extension.

  Granted Householder Extension Loft or dormer 19 docs
  Small domestic

• 148 Tyneham Road London Wandsworth SW11 5XR

  2025/2823 Submitted 7 Aug 2025 50 yards away

  90% historically approved · decision due ~2 Oct

  The proposal is for the like-for-like replacement of all existing sash windows at the property. The new windows will replicate the dimensions, detailing, and materials of the originals, ensuring continuity with the building's historic character. Material and Construction The new windows will be manufactured from Accoya wood, a highly durable and dimensionally stable modified timber. Accoya is created through a non-toxic acetylation process that significantly enhances the wood???s resistance to moisture, decay, and insect attack. With a service life of 50 years above ground and 25 years in ground or freshwater, Accoya is ideally suited for external joinery, particularly in heritage settings where longevity and sustainability are important. Accoya also boasts superior paint retention and minimal shrinkage or swelling, ensuring that the traditional sash window appearance is retained with minimal ongoing maintenance. Window Specification Each new sash window will include: ??? Traditional cords and weights operation to replicate the original vertical sliding mechanism ??? 24mm argon-filled double glazed units, providing modern thermal insulation while maintaining the appearance of single glazing ??? Applied glazing bars on both faces of the glazing, with an internal spacer bar, to mimic the look of true divided panes ??? Sash horns, where present, reproduced to match existing profiles exactly ??? Factory-applied paint finish in a colour that matches the existing palette and overall streetscape The replacements will be installed within the existing structural openings, ensuring that no alterations to the brickwork or fa??ade are required. Justification and Impact Assessment The existing windows are in poor condition, exhibiting signs of timber decay, failed glazing seals, and poor thermal performance. While repair is often the preferred approach in conservation contexts, in this instance the extent of deterioration makes full replacement the most practical and sustainable option. The proposed replacements have been designed with close attention to traditional details and use high-quality materials in keeping with the original construction. By using Accoya wood and replicating original joinery features, the proposals respect the architectural integrity of the building and the conservation area. The visual impact of the new windows will be neutral or positive. The like-for-like replacements will preserve the original design intent while offering improved energy efficiency and longer-term resilience. This aligns with the conservation objectives set out in Wandsworth Council???s guidance and the National Planning Policy Framework (NPPF), particularly paragraphs 199???206, which support the sensitive adaptation of heritage assets. SJB Sash Windows Specialist Ltd, 4, The Market, Wrythe Lane, Carshalton, Surrey, SM5 1AG www.sjbsashwindows.co.uk Email: [email protected] Office 0208 296 9487 Registered in United Kingdom, Number: 10453404

  Awaiting decision Full applications Windows or glazing

• 110 Tyneham Road SW11 5XR

  2026/1944 Submitted 25 Jun 2026 50 yards away

  Erection of an extension to form an additonal floor of accommodation; Erection of a part single, part two-storey rear/side extension.

  Granted Extension