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 New Window Openings in Northumberland?
Creating new window openings in existing walls where none previously existed. This is generally permitted but side-facing windows at upper-floor level have specific restrictions to protect neighbours' privacy.
Planning in Northumberland
89%
of planning applications granted
92%
decided within the statutory or agreed time
60%
of householder applications decided within 8 weeks
In the year to December 2025, Northumberland decided 1,923 planning applications. 799 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 Northumberland
Northumberland has 70 conservation areas. These include Acomb, Allendale, Alnmouth, Alnwick, Amble, Bamburgh. 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.
Northumberland has 6 recorded Article 4 directions. These include Berwick-upon-Tweed; Governor's House, Palace Green, Berwick-upon-Tweed; Holy Island; Longhirst. 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 Northumberland planning department to check whether an Article 4 direction applies to your property.
Check with Northumberland planning department before starting work to confirm whether your property is affected by any special designations.
Permitted Development Rules for New Window Openings
Adding new windows to existing walls is generally permitted under Part 1, Class A, provided the windows do not overlook neighbouring properties. Side-facing upper-floor windows must be obscure glazed and non-opening below 1.7m from the floor. New windows in the front elevation may change the building's appearance and could need PP in some areas.
Conditions
- 1Side-facing windows at upper-floor level must be obscure glazed and non-opening below 1.7m from the floor
- 2New windows should not significantly alter the external appearance of the dwelling
- 3Must comply with Building Regulations (structural, thermal, safety glazing)
- 4Check if the property has any Article 4 directions restricting window changes
Size and Dimension Limits
- No specific PD size limits for individual windows
- Structural lintel and support requirements apply based on wall type and opening size
When Permitted Development Does Not Apply
- Listed buildings require listed building consent
- Conservation areas may restrict new openings on visible elevations
- Overlooking is the most common reason for neighbours to object
- Creating large new openings in structural walls requires Building Regulations approval
What About Building Regulations?
Building regulations approval is likely required
Building Regulations approval is required covering structural support (lintels, padstones), thermal performance of the new window (Part L), safety glazing in critical locations (Part K), security requirements (Part Q, PAS 24), and ventilation (Part F). A structural engineer may be needed for large openings in load-bearing walls.
Building regulations are separate from planning permission. Even if your project is permitted development, you may still need building regulations approval. Contact Northumberland building control or use an approved inspector.
How to Apply in Northumberland
If you need planning permission for your new window openings, you can apply through Northumberland'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 Northumberland. 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?
Moderate risk if the new window overlooks a neighbouring property without being obscure glazed where required. The council can require the window to be altered or blocked up. This is a common source of neighbour disputes and enforcement complaints.
Frequently Asked Questions
Do I need planning permission for new window openings in Northumberland?
Does new window openings in Northumberland need building regulations?
How do I apply for planning permission in Northumberland?
How long does planning permission take in Northumberland?
What percentage of planning applications does Northumberland approve?
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