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 Battery Storage System in Horsham?
Installing a home battery storage system (such as Tesla Powerwall) to store electricity from solar panels or the grid. Internal installations are straightforward; external units follow outbuilding rules.
Planning in Horsham
92%
of planning applications granted
96%
decided within the statutory or agreed time
72%
of householder applications decided within 8 weeks
In the four quarters to 2026 Q1, Horsham decided 1,319 planning applications. 679 of these were householder projects such as extensions, loft conversions and outbuildings, of which 97% were granted.
Planning statistics: MHCLG planning application statistics, the four quarters to 2026 Q1. 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 Horsham
Horsham has 40 conservation areas. These include Adversane Conservation Area, Amberley Conservation Area, Billingshurst Conservation Area, Blackstone Conservation Area, Bramber Conservation Area, Coldwaltham Conservation Area. 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.
Horsham has Article 4 directions in force. Article 4 directions remove specific permitted development rights in defined areas. If your property is covered by an Article 4 direction, you may need planning permission for work that would normally be permitted. Contact Horsham planning department to check whether an Article 4 direction applies to your property.
Check with Horsham planning department before starting work to confirm whether your property is affected by any special designations.
Permitted Development Rules for a Battery Storage System
Generally permitted. Internal battery installation is an internal alteration that does not need planning permission. External battery units are treated as outbuildings or ancillary structures and follow Part 1, Class E rules (height limits, not forward of the principal elevation, not covering more than half the curtilage).
Conditions
- 1Internal installation: no planning permission needed
- 2External unit: follows outbuilding PD rules
- 3Must not be forward of the principal elevation
- 4External units within 2m of a boundary: maximum 2.5m height
- 5Must not cover more than half the curtilage (combined total)
Size and Dimension Limits
- Internal: no planning limits
- External: same height limits as outbuildings (2.5m within 2m of boundary; 4m/3m elsewhere)
When Permitted Development Does Not Apply
- Listed buildings: internal alterations may still need consent if they affect the building's character
- Fire safety considerations for lithium-ion battery storage
- Electrical installation must be carried out by a qualified electrician
- Some insurers have specific requirements for battery installations
What About Building Regulations?
Building regulations approval is not usually required
Building Regulations do not specifically cover battery storage units, but the electrical installation must comply with Part P. Work should be carried out by a registered electrician. The installation should comply with the manufacturer's specifications and any relevant fire safety guidance.
Building regulations are separate from planning permission. Even if your project is permitted development, you may still need building regulations approval. Contact Horsham building control or use an approved inspector.
How to Apply in Horsham
If you need planning permission for your battery storage system, you can apply through Horsham'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 Horsham. 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?
Very low risk. Home battery units are small and unobtrusive. Enforcement is extremely unlikely unless an external unit breaches outbuilding PD rules. The main risk is fire safety, which is a Building Regulations and insurance matter.
Frequently Asked Questions
Do I need planning permission for a battery storage system in Horsham?
Does a battery storage system in Horsham need building regulations?
How do I apply for planning permission in Horsham?
How long does planning permission take in Horsham?
What percentage of planning applications does Horsham approve?
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