Side extension planning approval rate in Dacorum
94% of 775 decided side extension applications in Dacorum 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.
94%
Approval rate, all years, from 775 decided
775
decided side extension applications in Dacorum: 726 approved, 49 refused
92%
Recent rate, decided since 2022, from 274 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 Withdrawn applications are excluded.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 2015 to 2026. 0 of 775 decided records have no year recorded. Coverage may have gaps within the date range.
274 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 Dacorum, or read about permitted development in Dacorum. An approval rate does not decide which route your property qualifies for.
Example side extension decisions in Dacorum
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 Dacorum's planning register using the references below. Descriptions may be shortened; read the complete proposal and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| 25/02806/FHA | 2026 | Approved | Double storey side extension. 5 Old Watling Street Flamstead St Albans Hertfordshire AL3 8HL |
| 25/02820/FHA | 2026 | Approved | Single story side extension 135 Adeyfield Road Hemel Hempstead Hertfordshire HP2 5JZ |
| 25/02822/FHA | 2026 | Approved | New bay window, garage conversion, porch, first floor side extension, replacement of conservatory with single storey rear extension and bike store. 2A Anglefield Road Berkhamsted Hertfordshire HP4 3JA |
| 24/02563/FHA | 2025 | Refused | First-floor side extension, hip to gable roof alteration, loft conversion with rear dormer roof extension 29 Cedar Walk Hemel Hempstead Hertfordshire HP3 9EB |
| 24/02903/FHA | 2025 | Refused | Two storey side extension, single storey extension to front and rear. Roof extension conversion and alterations. 37 Windmill Way Tring Hertfordshire HP23 4HH |
| 25/00070/FHA | 2025 | Refused | Two storey side extension and conversion of existing garage. 18 Mansion Drive Tring Hertfordshire HP23 5BD |
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 Dacorum
- Single-storey rear extension 95%, 1,607 decided
- Two-storey rear extension 92%, 841 decided
- Wraparound extension 93%, 266 decided
- Loft conversion and dormer 88%, 413 decided
- Rooflight 94%, 396 decided
- Outbuilding and garden room 89%, 399 decided
- Porch 95%, 208 decided
- Garage conversion 95%, 209 decided
- Basement 87%, 79 decided
- Window and door 93%, 407 decided