Single-storey rear extension planning approval rate in St Albans
42% of 1,253 decided single-storey rear 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.
42%
Approval rate, all years, from 1,253 decided
1,253
decided single-storey rear extension applications in St Albans: 520 approved, 733 refused
38%
Recent rate, decided since 2022, from 495 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 Withdrawn applications are excluded.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 single-storey rear 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.
| Reference | Year | Decision | Application |
|---|---|---|---|
| 5/2025/1237 | 2026 | Refused | Single storey rear extension and internal alterations 23 Bernard Street St Albans Hertfordshire Al3 5Qw |
| 5/2025/1625 | 2026 | Refused | Demolition of existing dilapidated garage and conservatory, internal alterations and replacement ground floor rear extension and garage replacement along wit... 40 Lattimore Road Wheathampstead Hertfordshire Al4 8Qe |
| 5/2025/2061 | 2026 | Approved | Certificate of Lawfulness (proposed) - Erection of single storey rear extension, insertion of skylight, alterations to fenestration including new windows 101 Mount Pleasant Lane Bricket Wood St Albans Hertfordshire Al2 3Xf |
| 5/2025/2156 | 2026 | Refused | Certificate of Lawfulness (proposed) - Construction of single storey rear extension 3 Sir Josephs Walk Harpenden Hertfordshire Al5 2Dt |
| 5/2025/2189 | 2026 | Approved | Certificate of Lawfulness (proposed) - Single storey rear extension 26A Highfield Road Sandridge Hertfordshire Al4 9Bx |
| 5/2025/2362 | 2026 | Approved | Certificate of Lawfulness (proposed) - Removal of existing conservatory approx 9sqm, replaced with single storey rear extension approx 3mx4.5m, masonry cavit... 26 Tintern Close Harpenden Hertfordshire Al5 3Nz |
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
- Two-storey rear extension 20%, 592 decided
- Wraparound extension 26%, 177 decided
- Side extension 31%, 349 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