Side extension planning approval rate in St Albans
31% of 349 decided side extension applications in St Albans 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.
31%
Approval rate, all years, from 349 decided
349
decided side extension applications in St Albans: 109 approved, 240 refused
24%
Recent rate, decided since 2022, from 140 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 Withdrawn applications are excluded.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 2017 to 2026. 0 of 349 decided records have no year recorded. Coverage may have gaps within the date range.
140 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 St Albans, or read about permitted development in St Albans. An approval rate does not decide which route your property qualifies for.
Example side extension decisions in St Albans
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 St Albans's planning register using the references below. Descriptions may be shortened; read the complete proposal and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| 5/2025/1842 | 2026 | Refused | Proposed part two-storey front and side extension. Conversion of garage to office, utility and shower room with flat roof lights and internal modifications a... 6 Brackendale Grove Harpenden Hertfordshire Al5 3Ej |
| 5/2025/1897 | 2026 | Refused | Single storey flat roof side extension to be built connecting to existing owned property 18 Harvesters St Albans Hertfordshire Al4 9Qu |
| 5/2025/2003 | 2026 | Refused | Proposed energy efficiency improvements to the existing house; demolition of existing garage and conservatory; erection of a two-storey side extension and a... 20 Park Hill Harpenden Hertfordshire Al5 3At |
| 5/2025/2160 | 2026 | Approved | Discharge of condition 5 (details of materials) of planning permission 5/2024/0872 dated 29/11/2024 for Two storey front and side extension, single storey si... 6 Barns Dene Harpenden Hertfordshire Al5 2Hq |
| 5/2025/0021 | 2025 | Approved | Certificate of Lawfulness (proposed) - Side extension 24 Catham Close St Albans Hertfordshire Al1 5Qt |
| 5/2025/0200 | 2025 | Approved | Certificate of Lawfulness (proposed) - Conversion of loft with hip to gable conversion, rear dormer and erection of single storey side extension 19 Orchard Drive Park Street St Albans Hertfordshire Al2 2Hq |
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 St Albans
- Single-storey rear extension 42%, 1,253 decided
- Two-storey rear extension 20%, 592 decided
- Wraparound extension 26%, 177 decided
- Loft conversion and dormer 68%, 670 decided
- Rooflight 65%, 801 decided
- Outbuilding and garden room 57%, 370 decided
- Porch 45%, 124 decided
- Garage conversion 70%, 141 decided
- Basement 51%, 124 decided
- Window and door 65%, 477 decided