Hayes, UB3 4QX

1. 1.The proposed single-storey rear extension, by reason of its excessive depth and cumulative scale when considered alongside the existing outbuilding within the rear garden, would result in the overdevelopment of the site. The development would erode the amount of usable private amenity space to an unacceptable level, creating a cramped and incongruous form of development that would fail to appear as a proportionate and subordinate addition to the host dwelling. The proposal would be detrimental to the character and appearance of the site and surrounding area and would fail to maintain an appropriate balance between built form and garden space. The development is therefore contrary to Policies DMHD 1, DMHB 11 and DMHB 18 of the Hillingdon Local Plan: Part Two - Development Management Policies (2020).
2. 2.The proposed single-storey rear extension, by reason of its excessive depth, siting and proximity PDECHHODB (ODB) 77924/APP/2026/2164 to the shared boundary with No. 34 Roseville Road, would result in an unacceptable loss of daylight and outlook and would give rise to an undue sense of enclosure and overbearing impact to the occupiers of that neighbouring property. Furthermore, insufficient information has been submitted to demonstrate compliance with the Council's 45-degree assessment in respect of the nearest habitable room window serving No. 34 Roseville Road. In the absence of satisfactory evidence demonstrating that the development would not result in unacceptable overshadowing, the Local Planning Authority cannot be satisfied that the proposal would preserve the residential amenities of neighbouring occupiers. The proposal is therefore contrary to Policies DMHD 1 and DMHB 11 of the Hillingdon Local Plan: Part Two - Development Management Policies (2020).
3. 3.The proposed single-storey rear extension, when considered in conjunction with the existing outbuilding within the rear garden, would result in the provision of approximately 35sqm of private outdoor amenity space, significantly below the minimum requirement of 60sqm for a three- bedroom dwelling. The cumulative extent of built development within the plot would lead to an unacceptable reduction in the quantity and quality of usable private amenity space available to future occupiers, failing to adequately meet their recreational and domestic needs. The proposal would also contribute to the overdevelopment of the site, resulting in a cramped form of development with insufficient open garden space remaining. The development is therefore contrary to Policies DMHD 1 and DMHB 18 of the Hillingdon Local Plan: Part Two - Development Management Policies (2020).
4. 4.The Applicant has submitted a location plan (7711) which includes land outside of the applicants ownership within the red line. As such certificate of ownership B should have been completed and notice served on the landowners at least 21 days prior to the submission of the application. In the absence of the correct Certificate of Ownership and the requisite notice having been served on all owners, the requirements of Article 13 of the Town and Country Planning (Development Management Procedure) (England) Order 2015 have not been met. The Local Planning Authority is therefore unable to determine the application favourably and planning permission is refused.

From the council's decision notice.

Postcode

UB3 4QX

Application type

Householder

Date validated

7 September 2026

Target decision date

2 November 2026

Case officer

Sadmir Kabashi