Daylight & Sunlight Assessment for Planning
A BRE-compliant daylight and sunlight assessment shows your council exactly how your scheme affects light to neighbouring homes and gardens. From £499 + VAT for a small terrace with a single-storey rear extension; most reports are £675-£935 + VAT, usually delivered in 4-5 working days.
The assessments councils ask for on planning applications.
Neighbour Solar Panel Impact Reports
APSH impact assessments for proposed solar panel installations nearby.
The tests your council asks for.
— No Sky Line (NSL) for daylight distribution inside rooms
— Annual Probable Sunlight Hours (APSH) for sunlight
— Overshadowing of gardens and amenity space
— The 25 degree and 45 degree planning tests
A proven process that delivers.
01 Receive Plans — CAD, PDF and 3D models.
02 3D Modelling — accurate SketchUp models.
03 Specialist Analysis — BRE-approved software.
04 Quality Review — checked by our senior team.
05 Defensible Report — clear, planning-ready.
Evidence your planning officer can rely on.
Avoid planning objections
Respond to objections
Avoid planning delays
Frequently asked
questions
Everything you need to know before ordering a report.
Still need help?
Please reach us at info@sunlightassessments.co.uk
if you cannot find an answer to your question.
What happens if the assessment does not meet the BRE guidelines?
Not meeting a BRE guideline does not automatically mean planning permission will be refused. We review the results in context and, where possible, recommend design changes or provide supporting commentary to help strengthen the planning case.
How much does a daylight and sunlight assessment cost for a home extension?
£499 + VAT covers the simplest job: a terraced house under 100 m² with a single-storey rear extension affecting one neighbour. Most home extension reports are £675–£935 + VAT.
What moves the fee up is how many neighbouring properties need testing, a larger house or a semi or detached rather than a terrace, and a two-storey, wraparound or roof extension rather than a single-storey rear. Whatever your project, the fee is fixed and agreed in writing before you commit.
Use the instant calculator for a quick estimate, or send us your plans for a confirmed fixed-fee quote.
What is the 45 degree rule?
The 45-degree rule is a planning rule of thumb used to assess whether a proposed extension or development could affect the daylight and sunlight received by neighbouring properties. If a proposal extends beyond a 45-degree line from a neighbouring window, a more detailed daylight and sunlight assessment may be recommended. It does not automatically mean the proposal will be refused.
Need a daylight and sunlight assessment?
Send us your plans and we will confirm which BRE tests your council needs, with a fixed fee agreed before you commit.
or call 01962 809155
Specialist daylight, sunlight and overshadowing assessments for planning and development across the UK.
FOR ALL NEW ENQUIRIES - please fill out the contact form.
37/39 Southgate Street, Winchester Hampshire SO23 9EH
15189362
