Outbuilding and garden room planning approval rate in St Albans
57% of 370 decided outbuilding and garden room 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.
57%
Approval rate, all years, from 370 decided
370
decided outbuilding and garden room applications in St Albans: 211 approved, 159 refused
56%
Recent rate, decided since 2022, from 189 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 Withdrawn applications are excluded.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 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 |
|---|---|---|---|
| 5/2025/2161 | 2026 | Refused | Non Material Amendment - Changes to fenestration, linking structure to be lower than approved design and roof geometry altered to avoid necessity to alter ex... Bowers Manor Holly Lane Harpenden Hertfordshire Al5 5Dy |
| 5/2025/2281 | 2026 | Refused | Certificate of Lawfulness (proposed) - Garden office and garden storage at the back of the property in the garden with decking 3 Jove Gardens Smallford St Albans Hertfordshire Al4 0Lp |
| 5/2025/2316 | 2026 | Approved | Certificate of Lawfulness (proposed) - Outbuilding 36 St Annes Road London Colney Hertfordshire Al2 1Lj |
| 5/2025/2351 | 2026 | Approved | Discharge of Condition 4 (construction management plan) of planning permission 5/2023/1740 dated 18/06/2024 for Construction of detached outbuilding (Class E... Rear Of 10 & 12 Station Road Harpenden Hertfordshire Al5 4Se |
| 5/2026/0071 | 2026 | Refused | Certificate of Lawfulness (existing) - Erection of a garden room to be used as an office and for purposes ancillary to the main dwelling 46 Foxcroft St Albans Hertfordshire Al1 5Sp |
| 5/2024/2034 | 2025 | Approved | Certificate of Lawfulness (proposed) - Building of a summer house in the rear garden (within permitted development conditions), patio area and pathways (not... 18 Brackendale Grove Harpenden Hertfordshire Al5 3Ej |
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
- Side extension 31%, 349 decided
- Loft conversion and dormer 68%, 670 decided
- Rooflight 65%, 801 decided
- Porch 45%, 124 decided
- Garage conversion 70%, 141 decided
- Basement 51%, 124 decided
- Window and door 65%, 477 decided