The Government's December 2025 draft of the National Planning Policy Framework (NPPF) does two things at once: it makes it easier to win consent for homes, and it makes daylight, sunlight and neighbour amenity a core test of whether a scheme is acceptable. For anyone designing or assessing residential development in England, those two ideas are now inseparable. Higher density is encouraged — but only where the resulting living conditions stand up to scrutiny.
The consultation on the draft ran from 16 December 2025 to 10 March 2026, so the final wording is still being settled. The direction of travel, however, is already clear, and it has direct consequences for how daylight and sunlight reports are prepared and weighed. This article explains the changes that matter most and how to keep a denser scheme on the right side of the amenity test.
What the December 2025 NPPF draft actually changes
The headline shift is structural. The framework has been re-platformed from its familiar narrative chapters into roughly 133 coded policies arranged by theme, so it reads much more like a local plan than guidance. Alongside that, the draft introduces a stronger, more directive presumption in favour of suitably located development — a default "yes" in the right places — and a new "medium development" category covering schemes of 10 to 49 homes on sites up to 2.5 hectares, intended to unlock smaller sites for smaller builders.
The change that most affects daylight is the explicit push for higher density. The draft promotes minimum residential densities in well-connected and sustainable locations — figures of around 40 to 50 dwellings per hectare have been widely reported — and actively encourages upward extensions, infill within residential curtilages, and the redevelopment of corner and low-density plots. In short, the policy wants more homes on the same land, taller and closer together.
Why density makes daylight the decisive test
Building more intensively does not suspend the laws of geometry. Taller and deeper blocks placed closer to one another cast longer shadows and reduce the sky each window can "see". That is precisely what daylight and sunlight assessment measures, so the more ambitious the density, the more the numbers are likely to be tested.
The draft framework recognises this directly. Commentary on the consultation notes that design checks are intended to focus on daylight, heritage settings, climate resilience and neighbour amenity, and that for higher-density schemes increased intensity must be offset by generous daylight, usable amenity space and a coherent townscape. Design-led evidence — daylight and sunlight studies, massing options, overheating analysis and energy performance — is treated as central to the decision rather than as a technical appendix bolted on at the end.
That is a meaningful change of emphasis. Where amenity studies were once supporting documents, the draft positions layout, massing and daylight as part of the core question of whether a proposal is acceptable at all. A scheme that maximises units but produces poorly lit rooms or harms neighbouring windows is exactly the kind of proposal the new design checks are written to catch.
The standards have not changed — only the stakes
It is worth being precise about what has and has not moved. The NPPF draft does not rewrite the technical guidance. Daylight and sunlight are still assessed against the BRE's Site Layout Planning for Daylight and Sunlight (BR 209, 2022 edition) and BS EN 17037, applied through each council's local-plan amenity and design policies. What the reforms change is the weight those assessments carry and the density of the schemes they are applied to.
The 2022 BRE guidance already moved the goalposts for new homes. Average Daylight Factor is no longer the measure for daylight provision to new dwellings; instead BR 209 follows BS EN 17037, offering a choice of methods based on target illuminance over a defined fraction of the working plane. Sunlight to new dwellings is assessed by the time windows receive direct sun on 21 March under cloudless conditions, rather than the older probable sunlight hours method. If you are still unclear on how those provision tests work, our explainer on the BRE 2022 daylight provision tests sets out the target illuminance approach in plain terms.
For impact on existing neighbours, the familiar metrics remain: Vertical Sky Component (VSC), the daylight distribution check using the No Sky Line, and Annual Probable Sunlight Hours (APSH). Our guide to VSC, NSL and APSH covers each in detail. Crucially, BR 209 has always allowed targets to be adjusted to local context — a point that becomes far more important under a density-led framework, as we explain in our piece on BR 209 Appendix F and alternative targets in cities.
How to keep a denser scheme on the right side of the line
The practical message for designers is to bring daylight thinking forward to the very start of the design, not to test it at the end. A few principles consistently make the difference:
- Assess at concept stage. Running daylight and sunlight studies on early massing options lets you compare layouts before they are fixed. Reworking a scheme after a planner's amenity objection is far more expensive than designing it out at the start.
- Use sensible spacing and stepping. Setbacks between blocks, stepping height down towards boundaries, and orienting habitable rooms towards open aspects protect both internal daylight and neighbouring windows.
- Design windows that earn their light. Larger and well-placed openings, taller heads, recessed balconies that do not over-shade the glazing below, and lighter internal surfaces all help rooms hit BS EN 17037 target illuminance.
- Set alternative targets honestly. In genuinely urban contexts, BR 209 supports context-based targets — but they must be justified against the established character of the area, not used to wave through poor amenity.
- Document the trade-offs. Where density forces a compromise, a clear assessment that shows the scheme performs as well as it reasonably can, with mitigation explained, is what gives a planning officer confidence to support it.
Getting this right first time is the cheapest route through planning. Our design guide on passing a BRE daylight assessment first time walks through the workflow in more depth, and London applicants should also read our update on London Plan daylight standards in 2026, where density and amenity tensions are sharpest.
What happens next
Because the December 2025 draft was still in consultation until March 2026, the exact density figures and policy wording may shift before the framework is finalised. The underlying logic is unlikely to reverse: more homes, in more places, with daylight and amenity as a gatekeeping design test. Local plans will take time to catch up with the recoded national policy, so for the moment councils will continue to apply BR 209 (2022) and BS EN 17037 through their existing adopted amenity policies. The sensible response is to assume that daylight evidence will be scrutinised more closely, not less, on the denser schemes the reforms are designed to encourage.
How Fortress Associates can help
Fortress Associates prepares BRE 2022 and BS EN 17037 daylight and sunlight reports for residential schemes of every scale, from single rear extensions to dense urban blocks. We can test your massing options early, identify where a layout risks failing the amenity test, and produce the design-led evidence that the new framework expects. Our daylight report service typically delivers within 4 to 5 working days, with no advance payment required, and we work with architects and homeowners across the UK. If you have a scheme coming forward under the new density policies, contact us to discuss it, or see the full range on our services page.
Sources & further reading
Need help with a UK planning project?
Fixed-fee daylight reports and Building Regulations drawings — delivered in 4–5 working days. No advance payment.
Request a free quote