Daylight and Sunlight Assessments in Enfield

Most of the Enfield work that reaches us is householder scale: side and rear extensions to the 1930s semis of Winchmore Hill, Southgate and Oakwood, deeper rear extensions to the terraces of Edmonton and Palmers Green, and the occasional infill or backland house around Enfield Town and Ponders End. Larger residential schemes come up around Meridian Water and the Lee Valley, but the typical enquiry is a homeowner or architect who has been asked by the council, or prompted by a neighbour, to show what a new wall close to the boundary will do to the light next door.

Enfield is one of the boroughs whose Development Management Document contains its own 45-degree rule for extensions, so officers will often run that simple check first and ask for a full BRE assessment when a scheme crosses the line. Our daylight and sunlight assessments are written to answer both: the geometric test the council starts with, and the BRE 209 figures it needs if the scheme does not clear it.

Recent daylight and sunlight assessments in Enfield

24 Coniston Gardens, Edmonton, N9 8NB: side and rear extension on a resubmission

A part single storey, part two storey side and rear extension to a semi-detached house in Edmonton. The owner had already been through the planning process once and wanted the revised design tested before it went back in, so that light to the neighbours was answered inside the application rather than raised after validation. We modelled the house and both neighbours and ran the standard BRE daylight and sunlight tests to the neighbouring windows, re-testing when corrected drawings arrived.

The application, reference 25/03099/HOU, was granted with conditions by Enfield Council on 31 October 2025.

What Enfield planning officers look for

Enfield's decisions currently rest on its adopted development plan, the Core Strategy (2010) and the Development Management Document (DMD, adopted November 2014), read alongside the London Plan. A new Enfield Local Plan covering the period to 2041 has been progressing through examination, but until it is formally adopted the Core Strategy and DMD remain the starting point for determining applications.

What sets Enfield apart from many boroughs is that the DMD contains an explicit geometric test for householder work. For residential extensions it advises that development should not breach a line drawn at 45 degrees from the mid-point of the nearest original ground-floor window on a neighbouring property. This 45-degree rule is used as an initial screen for loss of light and outlook, and where a proposal encroaches beyond the line the council expects the impact to be justified, usually through a daylight and sunlight assessment. We have written about how the rule is applied, and misapplied, in our 45-degree rule blog.

More broadly, the DMD requires new development to preserve neighbouring amenity in terms of daylight, sunlight, outlook, privacy and overshadowing, and it sets internal daylight expectations for new homes. For the numbers themselves Enfield relies, like most London councils, on BRE 209: Site layout planning for daylight and sunlight (2022 edition). An Enfield scheme is therefore often tested on two fronts: the borough's own 45-degree rule, and the BRE metrics of VSC, NSL and APSH where a fuller analysis is warranted.

You can review the emerging Local Plan at enfield.gov.uk/services/planning/new-enfield-local-plan and the adopted policy documents, including the DMD, via enfield.gov.uk/services/planning.

When you need an assessment in Enfield

• A side or rear extension to a semi in Winchmore Hill, Southgate, Grange Park or Bush Hill Park that crosses the DMD 45-degree line from a neighbour's ground-floor window
• A deep rear extension or two-storey addition to a terrace in Edmonton, Palmers Green or Bowes Park, where the neighbour's kitchen or living-room window sits a metre or two from the boundary
• A resubmission after an earlier application where loss of light to neighbours was raised, and you want the revised design tested before it goes back in
• A backland or infill house on a former garage plot or garden in Enfield Town, Ponders End or Enfield Lock, where the new rooms need adequate daylight as well as the neighbours keeping theirs
• A flat conversion or Class MA change of use on Green Lanes, Hertford Road or Southbury Road, where the council wants evidence that the new habitable rooms will be properly lit
• Any application where an Enfield officer has asked for a daylight and sunlight assessment in a validation letter or pre-application response

How we work

Nick Maslen scopes every job personally, agrees a fixed fee up front and tells you which neighbours and which tests are actually needed. Milica or Ana then builds a 3D model from your drawings and the surrounding context and runs the BRE 209 tests. Reports usually take 4–5 working days from receiving the information we need, and we re-test amended drawings for a modest fixed charge rather than starting again. The four tests are:

• VSC (Vertical Sky Component): how much sky each neighbouring window can still see
• NSL (No-Sky Line): how far daylight reaches into each neighbouring room
• APSH (Annual Probable Sunlight Hours): annual and winter sunlight to windows facing within 90 degrees of south
• Sun on ground: the share of a garden or amenity space that still receives two hours of sun on 21 March

The detail of each test is on our VSC, NSL and APSH page, and the thresholds are explained on our BRE guidelines page.

Frequently asked questions in Enfield

Does crossing Enfield's 45-degree line mean my extension will be turned down?

No. The DMD treats the 45-degree line as a first screen, not a decision. If your extension crosses it, the council will want a BRE assessment showing what the actual loss of daylight and sunlight is; many extensions that cross the line still sit within the BRE guidelines once the real window positions and orientation are modelled.

A neighbour in Edmonton has raised concerns about light on my application. Can a report still be submitted?

Yes. A daylight and sunlight assessment can be submitted while an application is live, and that is a common point for us to be instructed. We test the neighbour's windows and garden against BRE 209 so the officer has numbers to weigh the concern against, rather than two opposing opinions.

Will my report be public?

Once submitted it is published with the other application documents on Enfield's planning portal, which is why we write every report so that a neighbour, an officer or a planning committee can follow it without a technical background.

Get a fixed-fee quote

Send your drawings and the site address through our contact page, or use the price calculator for an instant figure; most Enfield householder reports fall within its standard bands. You can also call Nick on 01962 809155 or email nick@sunlightassessments.co.uk. If your site is on the Haringey side of the border, our Haringey page covers that council's approach.