Side extension planning approval rate in Westminster
87% of 242 decided side extension applications in Westminster 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.
87%
Approval rate, all years, from 242 decided
242
decided side extension applications in Westminster: 210 approved, 32 refused
82%
Recent rate, decided since 2022, from 134 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 Withdrawn applications are excluded. The eight-record threshold is a display rule, not a guarantee that a sample is statistically reliable.
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.
Coverage for this project type
Dated records in this archive span 2005 to 2026. 0 of 242 decided records have no year recorded. Coverage may have gaps within the date range.
134 decided records are dated 2022 or later. This is an archive count, not a measure of all current council activity.
These project categories can include different application routes and proposals combining several kinds of work. Read the proposal and decision type before comparing it with your project.
Check planning requirements in Westminster, or read about permitted development in Westminster. An approval rate does not decide which route your property qualifies for.
Example side extension decisions in Westminster
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.
Search Westminster's planning register using the references below. Descriptions may be shortened; read the complete proposal and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| 25/05579/FULL | 2026 | Approved | Erection of two storey side extension. |
| 25/05933/FULL | 2026 | Approved | Erection of side boundary wall, external side staircase, and lower ground side extension. Installation of and alteration to side windows and doors (Linked to... Flat A |
| 25/05934/LBC | 2026 | Approved | Erection of side boundary wall, external side staircase, and lower ground side extension. Installation of and alteration to side windows and doors. Associate... Flat A |
| 24/08331/CLOPUD | 2025 | Refused | Erection of a single storey side extension at lower ground floor level. |
| 24/08391/FULL | 2025 | Refused | Erection of lower ground floor single storey rear extension, re-instatement of original sash window on rear elevation at ground floor, and new sash window on... |
| 25/00528/NMA | 2025 | Refused | Amendments to planning permission dated 25th August 2015 (RN:15/02707/FULL) for Use of part ground and first to fifth floors as eight residential flats (Clas... Bond House |
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 Westminster
- Single-storey rear extension 86%, 1,743 decided
- Two-storey rear extension 84%, 287 decided
- Wraparound extension 72%, 46 decided
- Loft conversion and dormer 88%, 1,818 decided
- Rooflight 90%, 2,256 decided
- Outbuilding and garden room 83%, 164 decided
- Porch 84%, 495 decided
- Garage conversion 90%, 58 decided
- Basement 93%, 6,348 decided
- Window and door 89%, 10,172 decided