This is general guidance based on standard permitted development rights in England. Rules differ for listed buildings, conservation areas, and properties with Article 4 directions. Always confirm with your local planning authority before starting work.
Do I Need Planning Permission for a Biomass Boiler in Dacorum?
Installing a biomass boiler that burns wood pellets, chips, or logs to provide heating and hot water. The boiler itself is an internal installation, but the flue has specific PD conditions.
Planning in Dacorum
89%
of planning applications granted
83%
decided within the statutory or agreed time
76%
of householder applications decided within 8 weeks
In the year to December 2025, Dacorum decided 1,137 planning applications. 718 of these were householder projects such as extensions, loft conversions and outbuildings, of which 91% were granted.
Planning statistics: MHCLG planning application statistics, the year to December 2025. Conservation area and Article 4 data: planning.data.gov.uk, © Historic England / Crown copyright. Open Government Licence v3.0.
Important: Additional Restrictions May Apply in Dacorum
Dacorum has 23 conservation areas. These include Aldbury, Berkhamsted, Bovingdon, Chipperfield, Dudswell, Flamsted. If your property is in a conservation area, some or all permitted development rights may be restricted. For example, you may need planning permission for changes that would normally be permitted, including alterations to the roof, cladding, or extensions visible from a public highway.
Check with Dacorum planning department before starting work to confirm whether your property is affected by any special designations.
Permitted Development Rules for a Biomass Boiler
Generally permitted under Part 14 of the GPDO. The boiler is installed internally and does not need planning permission. The flue is permitted under the same rules as chimney/flue installation (Part 1, Class G): it must not exceed the highest part of the roof by more than 1m.
Conditions
- 1The flue must not exceed the highest part of the roof by more than 1m
- 2Only one flue per dwelling under PD
- 3Must comply with smoke control area requirements (DEFRA-approved appliance)
- 4The flue must not be on the principal elevation fronting a highway in designated areas
- 5Fuel storage (pellet/chip hopper) is an internal or outbuilding consideration
Size and Dimension Limits
- Flue: must not exceed highest part of roof by more than 1m
- One flue per dwelling under PD
When Permitted Development Does Not Apply
- Listed buildings require listed building consent for flue installation
- Smoke control areas require a DEFRA-approved appliance
- External fuel storage follows outbuilding PD rules
- Emissions must comply with clean air legislation
What About Building Regulations?
Building regulations approval is likely required
Building Regulations apply covering Part J (combustion appliances and fuel storage), Part L (energy efficiency), ventilation (adequate air supply), carbon monoxide detection, and flue design. A HETAS-registered installer can self-certify compliance.
Building regulations are separate from planning permission. Even if your project is permitted development, you may still need building regulations approval. Contact Dacorum building control or use an approved inspector.
How to Apply in Dacorum
If you need planning permission for your biomass boiler, you can apply through Dacorum's planning department or via the national Planning Portal.
If your project is permitted development and you want written confirmation, you can apply for a Lawful Development Certificate (LDC) from Dacorum. This provides proof that your project does not need planning permission, which can be helpful when selling your property.
What Happens If I Build Without Permission?
Low planning enforcement risk. The main regulatory risks are clean air legislation (smoke control areas) and Building Regulations compliance. Using a non-approved appliance in a smoke control area is a criminal offence.
Frequently Asked Questions
Do I need planning permission for a biomass boiler in Dacorum?
Does a biomass boiler in Dacorum need building regulations?
How do I apply for planning permission in Dacorum?
How long does planning permission take in Dacorum?
What percentage of planning applications does Dacorum approve?
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