Schaduwplan calculates, per address, how many hours of direct sun a window, garden or terrace receives, and what a building plan changes about that. The calculation runs on 3DBAG building models from TU Delft and AHN height data. Exploring is free; a report assessed against the TNO standard costs €49 and is ready in five minutes.
Analysis in 5 minutesChecked against the TNO standardUsable as evidence
Free to use — pay only for a report.
See a free 4-page preview of your own report — only pay once it's right.
From filing an objection to planning an extension. Pick the scenario closest to your question — the answers differ by context.
Add the planned building and see, day by day, how many hours of sun you stand to lose on the TNO reference days. The report is supporting evidence for your formal response (zienswijze), objection or legal proceedings.
Sketch your extension, roof addition or extra floor. See immediately how much shadow you cast on your own garden and on your neighbours'. Adjust the design — and submit a substantiated sunlight report to your municipality.
A sunlight study per project in 10 minutes, instead of 10 days.
Read moreProve to buyers that the garden really gets sun — and avoid surprises at the closing stage.
Read moreAlso for municipalities · law firms · insurers · property developers
From address to a report you can use as evidence — in less time than a lunch break.
The 3D model of your home and the surrounding buildings is ready in seconds.
Mark a terrace, window or vegetable garden — that is where the sun counts. Adjust a planned construction and compare before and after.
A PDF checked against the TNO standard with a north arrow, scale bar, measurement points and source references — usable as evidence with your municipality and in court.
A live 3D model in your browser. Draw, measure and export.
Hourly shadow calculations for any address in the Netherlands, based on 3DBAG LoD2 building models and AHN height data (AHN4/5/6).
Drag and drop an extension, roof addition or volume next door. See the current and planned situations side by side.
The required elements — north arrow, scale, TNO assessment, source references, methodology — are included by default.
Dutch courts and the Council of State (Raad van State) have accepted sunlight studies (bezonningsonderzoeken) as evidence for years — provided the methodology is sound and the source data can be checked.
Council of State, 2013
OotmarsumZoning plan annulled because sunlight substantiation was missing. The municipal duty of care (art. 3:2 Awb) requires concrete substantiation.
ECLI:NL:RVS:2013:191
Council of State, 2023
AlmeloThe light and strict TNO standards accepted as a reasonable assessment framework. The municipality decides which of the two applies.
ECLI:NL:RVS:2023:172
Council of State, 2023
VoorburgA height deviation of 3 cm accepted. A missing neighbouring building in the model was decisive, however — completeness of the context is essential.
ECLI:NL:RVS:2023:1329
What every report includes
Indicative supporting evidence. For complex procedures or appeals, we recommend consulting a lawyer.
PDF · 52 p.View the reportFrom users
Average 5.0 out of 5 · 1 review. We ask every customer for honest feedback two weeks after delivery.
Onze architect gaf aan twee dagen nodig te hebben voor een bezonningsstudie. Met dank aan Schaduwplan had ik in een mum van tijd een goed en bruikbaar rapport.
Joost
Huiseigenaar in Leiden
Not everything on the market actually solves the problem. Here is the honest comparison — feature by feature.
Sources — Agency prices and delivery times: public rate overviews from three Dutch consultancies (checked 15 Apr 2026). DIY tool figures based on public pricing pages (last checked 17 Apr 2026). 3DBAG LoD2 and AHN can be independently validated via 3dbag.nl and ahn.nl respectively.
Two kinds of evidence, in one report
Agencies deliver sunlight — direct hours of sun. But in neighbour law (art. 5:37 Dutch Civil Code: "the withholding of light") the judge also weighs daylight, not only sun. Schaduwplan shows both: the number of sun hours you lose and, per window, a sky-view indication of the daylight loss. Two lines of evidence that reinforce each other, in one report of five minutes.
The sky-view indication (VSC) is additional context, not a replacement for the sunlight assessment and not the statutory Bbl daylight requirement: that internal daylight factor remains a separate building-physics calculation by an expert.
Possibly covered by your home legal-expenses insurance.
Home legal-expenses insurance can cover sunlight reports in disputes about building permits or neighbour law. Check your policy for "deskundigenrapport" (expert report) or "bouwtechnisch advies" (technical building advice) — or email us and we will help.
How do I submit this to my insurer? →One single price. No subscription, no hidden costs.
Report
For one address, one decision — an objection, a permit or a purchase.
Not sure? Preview a free 4-page sample for your own address first — no account needed, only pay once it's right.
Traditional agencies charge €330–€535 per report with a delivery time of 5 working days.
See full detailsBezonningsstudie, bezonningsonderzoek or schaduwsimulatie Bezonningsstudie, bezonningsonderzoek and schaduwsimulatie are three words for the same thing: calculating where and when sunlight falls on a plot. In the Netherlands the result is assessed against the TNO standard — the light variant requires 2 hours of sun per day between 19 February and 21 October, the strict variant 3 hours between 21 January and 22 November. Schaduwplan calculates both.
Six answers that settle most doubts. Don't see yours?
No account needed for the 3D analysis. Pay only when you want to download a report.