Daylight & sunlight report in Crawley
- Fixed price
The short answer
Impact assessment for planning
- Price from
- £800.00
- Time on site
- 1 to 2 hours (for data collection, report is office-based)
What you get
You receive a comprehensive report with analysis, calculations, and visualisations detailing the impact on daylight and sunlight levels, usually in line with BRE guidelines.
Need Daylight & sunlight report in Crawley, West Sussex? Tell us about the job once and verified local professionals who cover Crawley send anonymous quotes. Compare price, rating and earliest slot, then choose. Company details are shared only after you book.
When do you need a Daylight & sunlight report?
Planners ask for this if they think your project will shadow others. It is common for rear extensions, big loft conversions, or new homes in tight spaces.
- When building near existing windows
- For large extensions in gardens
- If building high density flats
- To meet healthy living standards
- To avoid neighbour light disputes
- When requested by local planners
What happens on the day
A specialist usually creates a 3D digital model of your street using maps or a site visit. They check where the sun hits and how shadows move all year round.
- Surveyor measures your property size
- They record nearby window positions
- 3D software simulates sun paths
- They calculate light loss percentages
- Reports take one to two weeks
- Guide costs are £800 to £1,500
How to prepare
- Provide clear architectural floor plans
- Supply accurate site location maps
- Give photos of neighbouring windows
- Share details of building heights
- Grant access for a site visit
- Confirm your final design choice
- List any nearby tall trees
- Check your planning deadline date
How to improve your result
- Lower the roof height slightly
- Move walls further from boundaries
- Use glass to reflect light
- Angling walls away from windows
- Increase window sizes in designs
- Choose flat roofs where possible
Why it is useful day to day
Having this report ready helps your planning application pass without delays. It gives you peace of mind that your design is fair to everyone nearby.
- Stops planners rejecting your project
- Proves your new rooms are bright
- Reduces complaints from your neighbours
- Helps you build better homes
- Avoids expensive redesigns later on
- Protects your garden sunlight levels
Why we ask these questions
The report answers if your neighbours will notice a change in their light. It uses special tests to ensure rooms stay bright enough for daily tasks.
- Checks the 25 degree rule
- Measures Vertical Sky Component levels
- Tests sun hours on ground
- Reviews light inside new rooms
- Compares old and new shadows
- Confirms if light loss is fair
Frequently asked questions
Often needed alongside
Full architectural service
Concept to completion
Planning consultant
Strategy, appeals, pre-apps
- Legal requirement
Planning application
Prepare and submit
Planning appeal
Appeal a refusal
- Legal requirement
Structural calculations
Beams, walls removed, loft floors
- Legal requirement
CDM principal designer
Health & safety duties on projects
Cost plan & quantity surveying
Estimates, tenders, valuations




