Hemel Hempstead files loft conversions at 2.4 times the national rate. And 9 in 10 applications are approved.
Dacorum received 919 planning applications from the Hemel Hempstead area in 2025, up 10% on 834 in 2024. Of the 1,558 applications decided across 2024 and 2025, 89.7% were approved and 10.3% refused, about 1 in 10. That approval rate sits above the national 87.6%. The application mix is led by home improvement: extensions, dormers, and conversions dominate, with loft conversions filed at 2.4 times the national share and garage conversions at 2.1 times.
The year in one line
Hemel Hempstead approves more and refuses less than the national average, and its application mix is defined by home improvement, with loft and garage conversions filed at well above the national rate.
What Hemel Hempstead Is Building
Extensions lead, and loft and garage conversions run far above the national rate.
Home extensions were the most common application type, at 37.0% of the mix, well above the national share of 29.1%. Loft conversions were filed at 6.2% of applications against a national share of 2.6%, and garage conversions at 5.2% against 2.4% nationally. Dormers add a further 7.2%. This is the application mix of a settled suburban town where owners add space within the existing fabric of a home rather than build anew.
Applications submitted to Dacorum in 2025 within the Hemel Hempstead area, by project type.
The conversion effect
Loft conversions run at 2.4 times the national rate and garage conversions at 2.1 times. Both add space inside the existing footprint of a home, the dominant pattern in this town's applications.
The council verdict
A reliable yes.
Dacorum approved 89.7% of the applications it decided across 2024 and 2025, and refused 10.3%, better for applicants than the national average. Retrospective applications, where work is done before consent is sought, were filed at 2.4% of the mix, well below the national 3.7%.
About 1 in 10 Hemel Hempstead applications was turned down.
of applications were refused, about 1 in 10, against a national rate of 12.4%. The approval rate, 89.7%, sits above the national norm of 87.6%.
Hemel Hempstead vs The National Norm
A home improvement town, by the numbers.
Set Hemel Hempstead's application mix against the national average and the pattern is clear: adapting existing homes. Extensions run at 1.3 times the national share, loft conversions at 2.4 times and garage conversions at 2.1 times. The town also files retrospective work at well below the national share, the mark of a settled housing stock where owners plan ahead before breaking ground.
Hemel Hempstead submits loft conversions at more than twice the national rate. Together with garage conversions at 2.1 times, expanding upward and inward is the town's defining planning pattern.
Each bar is Hemel Hempstead's share of applications; the marker is the national share. Loft conversions are the town's clearest divergence from the norm.
Meanwhile, the market
Prices rose alongside the building work.
Owners are improving and enlarging the homes they already have, and values have moved up with them.
Hemel Hempstead's planning data tells a clear story. This is a town where owners improve and expand within the homes they already have, and the council grants permission more readily than most. Loft and garage conversions dominate at well above the national rate, refusals are below average, and retrospective work is rare. For anyone buying here, the data points to a town where ambitious home improvement is both common and routinely approved.
Where the numbers come from
Planning Data
Applications submitted to Dacorum in 2025, classified from each application's published description. Shares and rates are computed over the pooled 2024-2025 window for stability. Shares are each category as a percentage of all applications in scope.
Decision Rates
Approval rate is approvals as a share of approvals plus refusals, computed over the 1,558 decided applications across 2024-2025. The national benchmarks are computed the same way across all decided applications in England and Wales.
Sales Data
HM Land Registry Price Paid Data for the Hemel Hempstead post town, the latest full year's completions, with growth measured against the previous year.
The Real Applications
Open the planning applications behind the numbers.
These are real applications submitted to Dacorum in the Hemel Hempstead area, from extensions and conversions to a handful of refusals. Open any one to see its full record.
18 Hyde Lane, Nash Mills HP3 8RY
A single storey rear and side extension with the garage turned into a store was granted, pairing the town's two most common project types in one application.
See this property's full record3 Kendale HP3 8NN
Permission was given to convert a garage into habitable space, the category Hemel Hempstead files at 2.1 times the national rate.
See this property's full record58 St Albans Road HP2 4BA
A single storey rear extension and the conversion of a rear garage into a habitable room were approved together.
See this property's full record9 High Ridge Road HP3 0AG
An old conservatory was removed and replaced with a new single storey rear extension, the kind of home enlargement the town files most.
See this property's full recordBag End Hogpits Bottom, Flaunden HP3 0PX
A bid to turn an existing detached annex into a separate dwelling was turned down, one of the roughly 1 in 10 applications the council refused.
See this property's full record16 Farm End HP2 4ZA
A plan for three rear dormer windows to add a bedroom and ensuite was refused, a rare no among the town's conversion projects.
See this property's full recordCurious about a home in Hemel Hempstead?
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