Outbuilding and garden room planning approval rate in Westminster
83% of 164 decided outbuilding and garden room 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.
83%
Approval rate, all years, from 164 decided
164
decided outbuilding and garden room applications in Westminster: 136 approved, 28 refused
79%
Recent rate, decided since 2022, from 94 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 Withdrawn applications are excluded.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 outbuilding and garden room 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.
| Reference | Year | Decision | Application |
|---|---|---|---|
| 24/07810/FULL | 2026 | Approved | Erection of outbuilding to rear garden. |
| 25/06520/COFUL | 2026 | Approved | Internal and external alterations to Annexe Building including installation of new ceilings, new mechanical electrical, fire alarm, heating and water supply... Essendine Primary School |
| 25/06521/COLBC | 2026 | Approved | Internal and external alterations to Annexe Building including installation of new ceilings, new mechanical electrica, fire alarm, heating and water supply s... Essendine Primary School |
| 23/08613/FULL | 2025 | Refused | Replacement of existing metal framed outdoor structure on St Katherine with new powder coated, part glazed with retractable canopy and new timber cladding to... Temple Pier |
| 24/06164/FULL | 2025 | Refused | Erection of single storey outbuilding with air conditioning unit, extension to existing conservatory and erection of pergola to rear; Replacement windows at... |
| 24/07181/LBC | 2025 | Refused | Erection of timber summer house on 5th floor roof terrace (Linked with 24/07185/FULL). Flat 8 |
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
- Side extension 87%, 242 decided
- Loft conversion and dormer 88%, 1,818 decided
- Rooflight 90%, 2,256 decided
- Porch 84%, 495 decided
- Garage conversion 90%, 58 decided
- Basement 93%, 6,348 decided
- Window and door 89%, 10,172 decided