A planning application validation checklist is the list of drawings and supporting reports your local planning authority must receive before it will register your application at all. Get it wrong and the council does not refuse you — it simply returns the application as invalid, and the clock never starts.
Five technical reports account for most of the returns we see on UK schemes: the daylight and sunlight report, the flood risk assessment, the air quality assessment, the energy statement and the sustainability statement. This guide sets out when each one is triggered in 2026, which standard it must follow, and the five rule changes that landed this year and have quietly rewritten several validation lists.
What is a planning application validation checklist?
Every English local planning authority publishes a validation checklist in two halves. The national requirements are set by government and are identical everywhere: the application form, the fee, the location plan, the site plan, ownership certificates and — for major and designated-area schemes — a design and access statement. The local list is written by the council itself and is where the technical reports live.
Councils are required to keep the local list under review and to republish it at least every two years after consultation, so a checklist you downloaded for a previous application may already be out of date. Two neighbouring boroughs can and do set different thresholds for the same report. Always download the current PDF from the council you are actually applying to before commissioning anything.
The practical consequence: national policy sets the floor, the local list sets the rest, and the case officer validates against the local list. If you want to see what constraints apply to your red line before you read a word of policy, our free site constraints checker screens 14 national datasets from a postcode.
Do you need a daylight and sunlight report?
There is no national threshold for a daylight and sunlight report. It is triggered by local policy on residential amenity, and in practice by one of these situations:
- The scheme adds height or bulk close to a neighbouring window — rear extensions, roof extensions, backland and infill plots.
- The proposal creates new dwellings, so the council wants internal daylight and sunlight tested as well as the effect on neighbours.
- A neighbour has objected on loss of light, or an earlier application was refused on amenity grounds.
- The site sits in a conservation area or beside a listed building where the council applies a design SPD.
The governing documents are BRE BR 209 (2022), third edition, for the external tests — vertical sky component, no-sky line and annual probable sunlight hours — and BS EN 17037 for internal daylight provision. Both remain current. BRE and RICS are preparing a joint second-edition daylight standard expected around the end of 2026; until it lands, RICS advises using BR 209 (2022) alongside the current RICS professional standard on daylighting and sunlighting. We cover the implications in the BRE/RICS second edition, and the basics in what is a daylight report.
Assume a report is needed whenever your massing comes within roughly 45 degrees of a habitable neighbouring window, and check the council's design guidance rather than hoping the officer will not ask.
Do you need a flood risk assessment?
A site-specific flood risk assessment is required in England when the site is in Flood Zone 2 or Flood Zone 3, when it exceeds one hectare even in Flood Zone 1, or when it lies in Flood Zone 1 but is affected by another source of flooding — surface water, groundwater, reservoirs or ordinary watercourses. Change of use to a more vulnerable class can trigger one on its own.
The 2026 change matters here. On 28 May 2026 the Environment Agency added surface water climate change extents and banded depth information to the Flood Map for Planning, modelled on the upper-end (95th percentile) allowance to the 2070s epoch. Depths are now published in seven bands, from under 150 mm to over 2,300 mm. Sites that sat outside any mapped surface water extent before that date can now sit inside one — which can newly trigger an FRA, a Sequential Test, or an update to a drainage strategy you thought was finished. See the Flood Map for Planning 2026 update and Flood Zones 1, 2 and 3 explained.
On drainage, Schedule 3 of the Flood and Water Management Act 2010 has still not been commenced in England. Sustainable drainage is delivered through the planning system instead, against the refreshed national standards for SuDS and CIRIA C753, with the NPPF expecting SuDS in major development unless it can be shown to be inappropriate. If you are unsure whether your site needs one at all, run our flood risk assessment checker. Note that flood policy is devolved — the position above is the English regime.
Do you need an air quality assessment?
An air quality assessment is usually triggered by one of four things: the site falls inside or next to an Air Quality Management Area; the development generates enough vehicle movements to cross the local screening threshold; demolition, earthworks or construction traffic raise a dust risk; or the scheme introduces new residents close to a busy road, which is an exposure question rather than an emissions one.
Assessments are written to the EPUK/IAQM land-use planning guidance, IAQM dust guidance v2.2 (January 2024) and Defra LAQM.TG(22), with London schemes also answering London Plan Policy SI 1 on air quality neutral development. The EPUK/IAQM planning guidance is being substantively revised, with an exposure draft expected to go to member consultation around Q3 2026 — the existing edition still applies until that work concludes, so do not let a consultant quote against a document that has not been published. More detail in when an air quality assessment is required and our AQMA postcode checker.
Do you need an energy statement?
An energy statement is a planning document, not a building control one, and it is required wherever local policy asks for it — most commonly for new dwellings, major schemes and, in London, for anything the borough treats as a referable or policy-triggered application. Many boroughs also ask for one on single new-build dwellings.
The baseline today remains Part L 2021, assessed through the SAP 10.2 notional-building method, followed by the energy hierarchy — Be Lean, Be Clean, Be Green — with carbon savings quantified at each stage. London schemes must also address London Plan Policy SI2, the 35% on-site carbon reduction target and any carbon offset contribution.
The change to diarise: MHCLG published the Future Homes Standard on 24 March 2026, with new editions of Approved Documents L and F. It comes into force on 24 March 2027. Building regulations applications made before that date must commence construction before 24 March 2028 to stay under the current Part L; for higher-risk buildings the dates run to 24 September 2027 and 24 September 2028. Compliance will be demonstrated through SAP 10.3 or the new Home Energy Model. Schemes granted permission now but built out later will meet a tougher standard than the one their energy statement assumed, so it is worth designing to it early. See the Future Homes Standard and your energy statement and what is an energy statement.
Do you need a sustainability statement?
A sustainability statement pulls together the commitments a council cannot read off the drawings: biodiversity net gain, water efficiency, urban greening, materials, waste and — on larger schemes — a BREEAM rating.
Biodiversity net gain changed on 6 August 2026, and this is the single most consequential validation change of the year for small sites in England:
- Development where the red line site area is 0.2 hectares (2,000 m²) or less is exempt from mandatory BNG, provided priority habitat is not affected.
- A new exemption applies to temporary development on the same priority-habitat condition.
- The separate self-build and custom-build exemption has been removed for applications made on or after 6 August 2026 — though many such plots will now fall under the 0.2 ha exemption instead.
- For minor sites above 0.2 ha that are not exempt, the gain hierarchy is relaxed: on-site creation and registered off-site units can be considered at the same stage, rather than having to evidence that on-site delivery was exhausted first.
Applications received before 6 August 2026 are assessed under the rules in force when they were received. Read the 0.2 hectare exemption, the hierarchy change for minor sites and the end of the self-build exemption.
The rest of the statement is steadier: the 110 litres per person per day water efficiency standard under the Part G optional requirement, the Urban Greening Factor under London Plan Policy G5 for London sites, and BREEAM where the local plan requires a rating. Background in what is a sustainability statement.
The 2026 checklist at a glance
| Report | Typical trigger | Governing standard | 2026 change to watch |
|---|---|---|---|
| Daylight & sunlight report | Massing near neighbouring windows; new dwellings; amenity objection | BRE BR 209 (2022); BS EN 17037 | BRE/RICS joint second edition expected around end of 2026 |
| Flood risk assessment | Flood Zone 2 or 3; over 1 ha in Zone 1; other flood sources; vulnerable change of use | NPPF and PPG; EA FRA template (March 2025); CIRIA C753 | Surface water climate change extents and depth bands added 28 May 2026 |
| Air quality assessment | AQMA; traffic thresholds; demolition or earthworks dust; new exposure near roads | EPUK/IAQM; IAQM dust v2.2 (2024); LAQM.TG(22); London Plan SI 1 | EPUK/IAQM planning guidance under revision, consultation draft due around Q3 2026 |
| Energy statement | New dwellings; major schemes; London policy triggers | Part L 2021 and SAP 10.2; energy hierarchy; London Plan SI2 | Future Homes Standard published 24 March 2026, in force 24 March 2027 |
| Sustainability statement | New dwellings and majors; local sustainability checklist | Environment Act 2021 (BNG); Part G (110 l/p/d); London Plan G5; BREEAM | BNG exemptions and hierarchy changed 6 August 2026 |
How to check your council's local validation list in ten minutes
- Search the council's site for "local validation list" or "validation checklist" and download the current PDF — note its publication date.
- Find your application type in the table: householder, minor, major, or change of use. The thresholds differ sharply between them.
- Screen the site itself. Check the Flood Map for Planning, the AQMA layer, conservation area and listed building designations, and the red line area in hectares.
- Write down which of the five reports the list requires, which it says "may be required", and which it does not mention. The middle category is where applications get returned.
- Where a report is discretionary, ask the case officer in pre-application correspondence and keep the answer in writing.
Our planning application checklist generator and the wider set of free planning tools will do most of steps 2 to 4 from a postcode.
Why applications get returned as invalid
Invalidity is a scheduling problem more than a technical one. The council writes to you listing what is missing, the application sits unregistered until you supply it, and the eight or thirteen week determination period only begins once it is validated. A report that takes two weeks to commission and produce can therefore cost a month of programme if it is discovered late.
The recurring causes are dull and avoidable: using a validation list from a different council, treating "may be required" as "not required", commissioning a report against superseded data — surface water mapping and BNG rules both moved in 2026 — omitting a report because the previous application on the same site did not need one, and submitting a statement that lists intentions without the calculations behind them. For the budgeting side, see planning report costs in the UK and the companion guide to which planning application reports you need.
Frequently asked questions
Does a householder extension need all five reports?
Very rarely. A typical extension might need a daylight and sunlight report if it affects a neighbour's window, and a flood risk assessment if it sits in Flood Zone 2 or 3. Air quality, energy and sustainability statements are usually reserved for new dwellings and larger schemes, though a minority of councils ask for a short sustainability or energy note on householder work.
Is the validation checklist the same across the UK?
No. The national component differs by nation — NPPF in England, NPF4 in Scotland, Planning Policy Wales in Wales, SPPS in Northern Ireland — and the local list is written council by council. Mandatory BNG and the English flood risk regime described above apply in England.
Can one provider produce all five reports?
Yes, and it usually helps: the same site data feeds several of them, and a single provider will not produce an energy statement that contradicts the sustainability statement.
How current does the underlying data have to be?
Current at the date of submission. After the 28 May 2026 surface water update and the 6 August 2026 BNG changes, reports prepared earlier in 2026 may need refreshing before they are submitted.
What happens if the council asks for a report after validation?
It can still happen — an officer or consultee may request one during determination. That is not an invalidity, but it does consume determination time, which is why screening every trigger up front is worth the hour it takes.
Key takeaways
- The local validation list, not national policy, decides what your application must contain — download the current version from the correct council.
- Daylight and sunlight reports are triggered by amenity policy, not a national threshold; BR 209 (2022) and BS EN 17037 remain the standards.
- The Flood Map for Planning gained surface water climate change extents and depth bands on 28 May 2026, which can newly trigger an FRA.
- Air quality assessments still follow the current EPUK/IAQM guidance; the revision is only at consultation-draft stage.
- Part L 2021 is the live energy baseline; the Future Homes Standard applies from 24 March 2027.
- BNG changed on 6 August 2026: sites of 0.2 ha or less are exempt where priority habitat is unaffected, and the self-build exemption has gone.
How Fortress Associates can help
We produce all five reports. Our daylight and sunlight report service works to BRE BR 209 (2022) and BS EN 17037, typically delivered in four to five working days with no advance payment.
Our flood risk assessment service is a free, site-specific report built from live Environment Agency data, following the EA FRA template (March 2025) with a SuDS drainage strategy to CIRIA C753. The air quality assessment service is also free and draws on live Defra background maps, AQMA boundaries and DfT traffic counts, assessed against EPUK/IAQM criteria and LAQM.TG(22), covering every UK local authority.
The energy statement service is free and builds a Part L 2021 baseline using the SAP 10.2 notional-building method before working through the full energy hierarchy, including London Plan SI2 where it applies. The sustainability statement service is free and covers biodiversity net gain, the 110 l/p/d water calculator, urban greening and BREEAM where required.
See all of our planning report services, or get in touch with your postcode and application type and we will tell you which of the five your council will actually ask for.
Sources & further reading
- GOV.UK — Making a planning application (validation requirements)
- GOV.UK — National Planning Policy Framework
- RICS — Daylighting and sunlighting professional standard
- Environment Agency — Flood Map for Planning
- GOV.UK — Flood risk assessments: applying for planning permission
- GOV.UK — National standards for sustainable drainage systems
- IAQM — Guidance library (planning and dust)
- Defra — Local Air Quality Management (LAQM.TG(22))
- GOV.UK — Approved Document L: conservation of fuel and power
- GOV.UK — Future Homes and Buildings Standards
- GOV.UK — Understanding biodiversity net gain
- Defra — BNG amendments and transitional arrangements (July 2026)
- Greater London Authority — The London Plan
Need help with a UK planning project?
Fixed-fee daylight & sunlight reports and Building Regulations drawings — delivered in 4–5 working days, no advance payment — plus flood risk assessments, air quality assessments, energy statements and sustainability statements for planning applications across the UK.
Request a free quote