What Is a Design and Access Statement? A London Homeowner's Guide
What a Design and Access Statement is, when your London planning application needs one, what it must cover under the DMPO 2015, and how a strong DAS wins approval.
If you are applying for planning permission in London, you may be asked to submit a Design and Access Statement, often shortened to DAS. It is one of the most misunderstood documents in the whole planning system. Some homeowners assume every application needs one, others never realise their scheme triggers the requirement, and a great many treat it as a box-ticking exercise rather than the persuasive tool it can be. Getting it right can be the difference between a smooth approval and a refusal.
This guide explains, in plain English, what a Design and Access Statement actually is, the exact legal rule that decides when your application needs one, what the document must cover, and how it differs from the planning statement and heritage statement it is so often confused with. It is written for London homeowners planning an extension, loft conversion or change of use, where local conservation designations frequently pull otherwise modest schemes into DAS territory that a suburban equivalent would escape.
What is a Design and Access Statement?
A Design and Access Statement is a concise written report, submitted alongside your drawings and application forms, that explains the thinking behind a proposal and justifies its design in words. Rather than leaving the case officer to interpret the plans alone, it sets out why the scheme looks the way it does, how it responds to its surroundings, and how people will reach and move through the finished building.
The document has two halves, hinted at in its name. The design element covers the visual and physical qualities of the proposal. The access element covers how everyone, including disabled people, will approach and use the development. It is meant to be proportionate: a couple of well-argued pages for a small scheme, more for a complex one. It is a supporting statement, not a legal contract, but it carries real weight in how an officer reads your application.
What is the legal basis for a Design and Access Statement?
The requirement sits in Article 9 of the Town and Country Planning (Development Management Procedure) (England) Order 2015, universally called the DMPO. Article 9 is the single rule that decides, by law, whether your application must be accompanied by a DAS. Local validation checklists cannot invent a broader requirement than the DMPO allows, though they can and do restate it.
Article 9 draws a line based on the type and scale of development, and on whether the site sits in a designated area such as a conservation area. Because the trigger is statutory rather than discretionary, a case officer can lawfully refuse to validate an application that needs a DAS and does not have one. That is why understanding the thresholds below matters before you submit.
When does a London planning application need one?
Under Article 9 of the DMPO, a Design and Access Statement is required for major development and for certain development in sensitive locations. For a London homeowner, the second category is the one that catches people out, because so much of the capital is designated.
Major development thresholds that always require a DAS
Major residential development means ten or more dwellings, or a site of 0.5 hectares or more where the number of homes is not yet known. For other uses it means 1,000 square metres of new floorspace or a one-hectare site. Householders rarely reach these figures, but small developers converting a house into multiple flats can, and once you cross the line a DAS is mandatory.
Conservation areas and listed buildings in London
In a conservation area or World Heritage Site, a DAS is required where the proposal involves one or more dwellings, or 100 square metres or more of floorspace. For works to a listed building needing listed building consent, a DAS is also required. Given how many London streets are within conservation areas, a modest rear extension or a new infill dwelling can trigger the requirement even when the equivalent scheme elsewhere would not.
Do householder extensions need a Design and Access Statement?
Usually not. A standard householder application, such as a single-storey rear extension or a straightforward loft conversion outside a designated area, does not require a DAS under Article 9. This is the most common source of confusion, because the document is talked about so much that owners assume it is universal.
The important caveat is location. The moment that same extension sits inside a conservation area and involves the relevant floorspace, or touches a listed building, the DMPO thresholds can pull it back into scope. Even where a DAS is not legally required, a short design justification is often worth including voluntarily, because it gives the case officer the reasoning they need to say yes. Well-prepared drawings paired with a clear rationale are exactly what gets London schemes approved first time.
What must a Design and Access Statement cover?
A DAS must explain the design principles and concepts behind the proposal and the approach to access. Historically these were broken down into named headings, and they remain the clearest way to structure the document. Cover each in proportion to the scale of your scheme.
- Use — what the building or extension will be used for, and the mix of uses if more than one.
- Amount — how much development is proposed, such as the number of units or the floor area created.
- Layout — how buildings, spaces and routes are arranged in relation to each other and the street.
- Scale — the height, width and length of each building relative to its surroundings and neighbours.
- Landscaping — how open spaces, planting, boundaries and hard surfaces will be treated.
- Appearance — the materials, detailing and visual character that give the scheme its look.
- Access — how everyone, including disabled people, will reach the site and move through it, plus vehicle and pedestrian access and parking.
How does a DAS differ from a planning statement or heritage statement?
These three documents are routinely confused because they can all appear in the same application and their content overlaps. Each answers a different question, and a strong submission keeps their roles distinct rather than repeating the same paragraphs three times.
Design and Access Statement versus planning statement
A DAS justifies the physical design and the access strategy. A planning statement is broader: it argues that the proposal complies with national policy, the London Plan and the borough's Local Plan, addressing matters such as land use, density, amenity and highways in policy terms. The DAS says why the scheme looks and works the way it does; the planning statement says why it is acceptable in policy.
Design and Access Statement versus heritage statement
A heritage statement, sometimes called a heritage impact assessment, is required where a proposal affects a heritage asset such as a listed building or conservation area. It describes the significance of the asset and assesses the impact of the works on that significance, as required by the National Planning Policy Framework. A DAS may reference heritage, but it does not replace this dedicated appraisal.
How does a well-argued DAS improve your approval odds?
A case officer reading dozens of applications forms a first impression quickly. A clear, honest Design and Access Statement does the persuading for you: it pre-empts the objections an officer would otherwise raise, shows that you have understood the local context, and links each design decision back to the character of the street. Where a scheme sits in a conservation area, demonstrating that you have respected building lines, materials and rhythm can turn a borderline judgement in your favour.
The determination clock is only eight weeks for a householder or minor application, and officers rarely have time to chase missing reasoning. A DAS that anticipates their questions reduces the risk of a refusal or a request for amendments that pushes you past that deadline. It is worth writing carefully, or having it written by someone who prepares these documents for London boroughs day in and day out.
| Scenario | DAS required? | Reason |
|---|---|---|
| Single-storey rear extension, no conservation area | No | Householder development below Article 9 thresholds |
| Rear extension inside a conservation area, over 100sqm or one dwelling | Yes | Designated area threshold met under Article 9 |
| Works needing listed building consent | Yes | Listed building works require a DAS |
| House converted into 10 or more flats | Yes | Counts as major development |
| Loft conversion outside any designation | No | Not major and not in a sensitive location |
Related services: Planning Drawings, Architectural Drawings, Planning Permission.
Frequently asked questions
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