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 Bi-Fold or Sliding Doors in Maidstone?
Installing bi-fold, sliding, or French doors, typically to open up a living space onto a garden or patio. Replacing an existing window or door opening with bi-folds is usually PD; creating a new large opening in the wall has additional considerations.
Planning in Maidstone
82%
of planning applications granted
97%
decided within the statutory or agreed time
84%
of householder applications decided within 8 weeks
In the year to December 2025, Maidstone decided 1,125 planning applications. 552 of these were householder projects such as extensions, loft conversions and outbuildings, of which 89% 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 Maidstone
Maidstone has 49 conservation areas. These include Bearsted Extension, Bearsted, Holy Cross Church, Bearsted, Village Green, Boughton Malherbe, Boughton Monchelsea, Cock Street, Boughton Monchelsea, The Green. 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.
Maidstone has 84 recorded Article 4 directions. These include Beaux Aires Farm,; Bow Bridge and Teston Bridge; Butlers Farm Loose; Clarendon Place. 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 Maidstone planning department to check whether an Article 4 direction applies to your property.
Check with Maidstone planning department before starting work to confirm whether your property is affected by any special designations.
Permitted Development Rules for Bi-Fold or Sliding Doors
Generally permitted. Replacing existing doors or windows with bi-fold or sliding doors is treated as improvement and does not usually require planning permission. Enlarging the opening may be PD under Part 1 provided it does not significantly alter the building's appearance.
Conditions
- 1Replacing an existing door or window with bi-folds of a similar size is generally PD
- 2Enlarging the opening requires structural work and Building Regulations approval
- 3Materials and appearance should be in keeping with the existing property
- 4Rear installations are more likely to be PD than front-facing ones
Size and Dimension Limits
- No specific PD dimension limits for replacement doors
- Structural limits depend on the wall type and lintel requirements
When Permitted Development Does Not Apply
- Listed buildings require listed building consent
- In conservation areas, bi-folds on front or highway-facing elevations may need PP
- Large openings in structural walls require engineer-designed lintels or steel beams
- Ensure adequate drainage and threshold detailing to prevent water ingress
What About Building Regulations?
Building regulations approval is likely required
Building Regulations approval is required covering structural support (steel beams or lintels for large openings), thermal performance of the glazing (Part L), safety glazing (Part K), security (Part Q, PAS 24), and ventilation. FENSA or CERTASS-registered installers can self-certify the glazing element.
Building regulations are separate from planning permission. Even if your project is permitted development, you may still need building regulations approval. Contact Maidstone building control or use an approved inspector.
How to Apply in Maidstone
If you need planning permission for your bi-fold or sliding doors, you can apply through Maidstone'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 Maidstone. 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 risk for rear-facing bi-folds replacing existing openings. Higher risk in conservation areas or on front elevations. The main practical issue is ensuring Building Regulations compliance for the structural opening.
Frequently Asked Questions
Do I need planning permission for bi-fold or sliding doors in Maidstone?
Does bi-fold or sliding doors in Maidstone need building regulations?
How do I apply for planning permission in Maidstone?
How long does planning permission take in Maidstone?
What percentage of planning applications does Maidstone approve?
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