A white-label report engine for daylight & sunlight consultants
Send the model and the engine runs every BRE 209 test on the real geometry: sky at the neighbours' windows, daylight inside the rooms, sunlight hours, sun on the garden. You get back the whole report, laid out and ready for your signature.
Turnaround
The whole report, in minutes.
Every test runs in seconds on a real house.
Deterministic
No AI.
Every figure is computed from the standard's own definitions — nothing guessed, sampled or generated. The same job gives the same numbers, every time, so what you sign today still stands tomorrow.
AThe report
Every BRE 209 test, for every window, room and garden the scheme touches — laid out as a finished document under your practice's name, ready for your signature.
| Test | Family | What it answers | BRE 209 |
|---|---|---|---|
| Vertical sky component | Daylight | Does each neighbouring window still see enough sky — before and after, with the ratio to its former value | §2.2 |
| Daylight distribution & no-sky line | Daylight | How much of each room still sees the sky, and where the line falls | §2.2, App C |
| Daylight factor | Daylight | Is the room still bright enough inside — mean, median and the share above target across the working plane | §2.1 |
| Probable sunlight hours | Sunlight | Sun at each window over the year and in winter, and whether the neighbour loses noticeable sunlight | §3.2 |
| Sun on the ground | Sunlight | Does the garden keep two hours of sun on 21 March over at least half its area | §3.3 |
| Shadow studies | Sunlight | Where the shadow falls at each hour, existing beside proposed, and the sun the extension takes | §3.3 |
Around the results, everything a signed report carries: the renders, the sun it was cast by, the method and its limits, the published error bounds, the references, and what a second person would need to reproduce it. Every figure says where it came from — your model, a photograph, a survey, or typed in by hand — so a reading off a photograph can never pass for a survey.
A2Worked example
Real output from the validated engine on this geometry. The same before/after pair drives the §3.2 sunlight verdict at the window — annual and winter sunlight hours, and whether the neighbour loses noticeable sunlight. Change the extension depth and run it again in seconds.
BThe app
We supply the whole app and every service behind it — built around a certifier's job, from the drop to the signed report.
Your IFC, and which side you act for — asked once. The neighbourhood comes in by itself: survey heights, mapped outlines, facade photographs.
Your file exactly as the engine read it. Verified writes a fingerprint into the report; Something is wrong stops it there.
Every BRE 209 test, for every window, room and garden — laid out under your name, in minutes.
Under your name, with no watermark. Every delivery is recorded — to whom, and when.
What would change the result: where the proposal is free, where it costs sky but stays within guidance, where it makes no difference.
Click the window. Three ways out: our reading of their window, the neighbour's room, or the proposal. Free to prepare.
A sent report is never touched. The next one stands beside it, and what changed is worked out, never typed.
The demo is a worked practice with eight jobs, a finished report and a real IFC model to run. Nothing you do in it is charged, and nothing leaves your browser.
CSecurity
Your client's drawings stay in your hands. Nothing can be read on the way, and every report you send is on a record that cannot be rewritten.
Your model never leaves your computer — only the measurements taken from it cross. And our engine is a stateless machine: it holds nothing between runs, so by design there is nowhere for your data to stay.
On top of standard HTTPS, what crosses is split into three encrypted pieces. No piece means anything on its own.
Every report, revision and delivery is sealed to the one before. Nothing can be rewritten, so if a report is challenged you can show what you sent, when, and from what.
DValidation
Every test is checked against Radiance and published references, and the error bounds are published. The whole record was re-run on 24 September 2026 with zero failures.
EAccess
You certify; we supply the engine and the document. Your practice's name, logo and signature block go on the cover and on every page, and ours goes nowhere, with no watermark. The judgement calls stay yours: the neighbour's assumed layout, which rooms count, and which side you act for.
We onboard practices one to one, by enquiry: your first study is run with you on your own geometry. Tell us the practice, the kind of schemes you assess, and the format you work in, and we'll set you up. enterprise@kairoico.com