Planning applications in Hounslow

Planning in Hounslow

Extensions are refused often in Hounslow. Rear extensions, loft conversions and dormers, side extensions, front extensions and porches, and garden rooms and outbuildings were each refused about 1 in 3 times, against national rates of about 1 in 7 for most of them and about 1 in 5 for lofts. Driveways and dropped kerbs also sit at about 1 in 3. Anyone planning extension work should prepare for a serious chance of refusal.

Across more than 122,000 applications, about 1 in 4 decided applications was refused, compared with about 1 in 7 across the areas we cover. Every neighbour with a rate is more lenient: Ealing and Hillingdon refuse about 1 in 5, Richmond about 1 in 7 and Hammersmith and Fulham about 1 in 8.

Rear extensions alone number more than 46,000 applications, loft conversions and dormers more than 17,000 and side extensions more than 16,000. Windows and doors, with more than 13,000, were refused about 1 in 4 times, far above the national rate of about 1 in 9. Fences, walls and gates are about 1 in 5, still more often than the national rate of about 1 in 7.

Hounslow has 43 conservation areas, 512 listed buildings and 3 Article 4 directions. Check whether your property is covered before you settle on materials or windows.

Householder decisions across 2023 to 2025 took a median of 8 weeks, and about six in ten (60 per cent) were decided within 8 weeks.

The latest year is slightly better. In 2025 about 1 in 5 decided applications was refused, against about 1 in 4 across the three years before. There were 3,447 applications in 2025, down from an average of about 3,764 a year, and the busiest year on record was 2016, with 5,120. With a refusal rate this high, the best habit is to look at what has been approved on nearby streets before you draw anything up.

Figures in this section as of 9 October 2026.