Two-storey rear extension planning approval rate in Hillingdon
66% of 2,756 decided two-storey rear extension applications in Hillingdon were approved.
Checked against 20.6 million UK planning applications on file across 420 planning authorities. Approval rates from 2,343,419 decisions we classified across 181 councils in England.
A similar project nearby can help you understand the council's decisions. Its outcome does not establish what will be acceptable at your address.
66%
Approval rate, all years, from 2,756 decided
2,756
decided two-storey rear extension applications in Hillingdon: 1,817 approved, 939 refused
74%
Recent rate, decided since 2022, from 1,241 decided
How to read these rates
These are historical outcomes for the applications in our archive, not the chance of approval for your property. Compare the same project type and read the decided count alongside each percentage.
About the planning data
Rate = approved divided by approved plus refused, using the decisions in our classified archive. Rates are withheld as unknown where fewer than 8 records of that project type were decided. Withdrawn applications are excluded.
Recent means records dated 2022 or later. Records without a year are excluded from the recent rate but remain in the all-years figure. Historical coverage varies by council, and duplicate application references may remain in the archive.
Approval rates from 2,343,419 decisions we classified across 181 councils in England. The wider 20.6 million application catalogue is accessible through PlanIT; it is not the dataset used to calculate these percentages.
Read the full methodology and coverage notes.
Project types and outcomes are classified from council records. Check the original application and decision notice before relying on an individual example. A page rebuild does not mean every council record has just been refreshed.
Example two-storey rear extension decisions in Hillingdon
These examples deliberately include approved and refused applications where available. They are not a representative sample or a list of the latest decisions. Look up each reference on the council's planning search to read the plans and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| 14440/APP/2025/2882 | 2026 | Approved | Erection of two storey side extension, part single part two storey rear extension, 2 x rear dormers, 2x roof lights to the front, and amendments to fenestrat... 28 DAWLEY AVENUE |
| 14458/APP/2025/2793 | 2026 | Approved | Variation of Condition 2 (Approved Plans) of planning permission ref. 14458/APP/2025/873, dated 07-05-25 (Erection of a part single part two storey rear exte... 149 BEVERLEY ROAD |
| 15095/APP/2025/2995 | 2026 | Approved | Variation of Condition 2 (Approved Plans) of planning permission ref. 15095/APP/2025/2096, dated 13-11-25 (Erection of part single storey, part two storey si... 13 HIGHFIELD DRIVE |
| 16161/APP/2025/3221 | 2026 | Refused | Variation of Condition 2 (Approved Plans) of planning permission ref. 16161/APP/2025/1840, dated 29-08-2025 [Variation of Condition 2 (Approved Plans) of pla... 104 COPSE WOOD WAY |
| 17611/APP/2025/2884 | 2026 | Refused | Erection of a single storey rear extension, first floor rear extensions, alterations to roof form including a new rear dormer extension. Erection of a single... 42 PIELD HEATH ROAD |
| 20677/APP/2025/3135 | 2026 | Refused | Ground floor and first floor front and first floor rear extensions to created additional habitable roofspace 10 PIELD HEATH AVENUE |
About the planning data
Checked against 20.6 million UK planning applications on file across 420 planning authorities. Approval rates from 2,343,419 decisions we classified across 181 councils in England.
Other project types in Hillingdon
- Single-storey rear extension 83%, 7,240 decided
- Wraparound extension 79%, 844 decided
- Side extension 71%, 1,686 decided
- Loft conversion and dormer 74%, 585 decided
- Rooflight 89%, 2,768 decided
- Outbuilding and garden room 81%, 1,230 decided
- Porch 75%, 374 decided
- Garage conversion 89%, 425 decided
- Basement 86%, 432 decided
- Window and door 86%, 496 decided