Design and access statement for a barn conversion

A barn conversion design and access statement has one argument to make: that the building can become a house without ceasing to be a barn. Everything in the document, from the structural appraisal to the choice of rooflight, either supports that argument or works against it. Officers refuse rural conversions when the drawings show a new house wearing an old shell, and the statement is where you show that is not what is proposed.

When a statement is required

A design and access statement is required for major development, for applications in a conservation area or World Heritage Site involving one or more dwellings or 100 square metres or more of floorspace, and for listed building consent. A single barn conversion outside a conservation area on a full application usually falls outside that list.

Prior approval under Class Q is different again. It is not a planning application and no statement is required, but design and external appearance is one of the matters the council considers, so a short design statement addressing exactly that point is the most useful document you can submit. Our note on what to check before submitting a prior approval application covers the wider submission.

So in most rural conversions the statement is voluntary. Write one anyway, keep it to eight or ten pages, and let it carry the drawings that make the case.

Assessment of the existing building

Start with what is there, described precisely rather than admiringly. Form and dimensions, construction, the date and evidence for it, the openings and their sizes, the roof structure and covering, the floor, the historic use, and any later additions with their dates.

Photograph every elevation square on, plus the interior looking in both directions along the building and up into the roof. Number the photographs and key them to a plan. This section does more work than any other, because it is the baseline against which every proposed change is judged.

Be honest about condition. A statement that describes a partly collapsed structure as sound invites the officer to visit and form their own view, and the application then proceeds with a credibility problem.

Structural capability and what it means for design

The structural question has a planning consequence. A conversion has to be a conversion, and a scheme that in reality amounts to demolition and rebuild behind a retained gable is not one, whichever route it is submitted under. Class Q in particular permits works reasonably necessary to convert the building, which does not extend to replacing the structure.

Commission a structural appraisal before designing. A Structural Survey should state what the frame and walls can carry, what strengthening is needed, whether the foundations are adequate for a residential loading, and whether the roof can be insulated within the existing profile. Councils expect a suitably qualified author and professional review is strongly advised.

Then let the survey drive the design. If the frame cannot carry an upper floor without a new steel structure, either the scheme becomes single storey or the intervention is stated openly with its justification. Concealing the extent of structural work in a general arrangement drawing is the fastest route to a refusal that is hard to appeal.

Design response and materials

The design section should explain each move and tie it back to the building. Use the existing openings for the principal windows. Where new openings are needed, put them on the least prominent elevation, keep them to a simple rectangular form, and set the glazing deep in the reveal.

Four details decide how these schemes read once built.

1. Glazing set back from the face of the wall rather than flush with it.
2. Simple unfussy frames, dark rather than white, with minimal subdivision.
3. Rooflights in a conservation profile, sitting flush with the roof plane, and as few as the building regulations permit.
4. Doors that acknowledge the original cart opening rather than filling it with a domestic front door and a fanlight.

Materials should be named with references, not described. Lime mortar mix, roof covering, the treatment of any new cladding, rainwater goods in the same material as the existing. Say what happens to the original doors if they are being removed.

Keep domestic clutter off the elevations. Flues, meter boxes, vents, satellite dishes and external lighting all need showing on the drawings and positioning where they will not read from the approach.

What to leave out

Two things pad these statements without helping. The first is a policy chapter reciting national and local policy at length, which belongs in the planning statement if it belongs anywhere. The second is a paragraph on sustainability credentials written in general terms, which an officer discounts on sight.

Replace both with a page of drawings. A comparative elevation showing the barn as existing and as proposed, side by side at the same scale, answers more questions than four pages of prose.

Access, parking and curtilage

Curtilage is where rural conversions most often go wrong after consent. A conversion granted with a modest area of hardstanding turns, within two years, into a lawn, a post-and-rail fence, a washing line and a trampoline, and the agricultural character the permission relied on has gone.

Deal with it in the statement. Show the proposed curtilage on a plan with a clear boundary, keep it tight to the building, and describe the surface treatments: gravel or hoggin rather than block paving, a farm-style gate rather than suburban railings, no kerbs.

Access and parking need the same discipline. Show the visibility splays at the junction with the public road, the turning area, and two parking spaces surfaced in bound material only where the highway authority requires it. Where the access is shared with a working farm, say how the arrangement works in practice.

Landscape and boundary treatment

The landscape section is short and specific. What boundaries exist, what is retained, what is proposed, and what is deliberately not proposed.

For most conversions the right answer is native hedgerow, existing stone walls repaired, and no ornamental planting. Resist the urge to draw a garden. A planting plan showing lavender and specimen trees around a stone barn tells the officer that the applicant has not understood the building.

Where a Design and Access Statement is formally required, this section also has to address inclusive access, which in a rural conversion means level or gently ramped access to the principal entrance and a threshold detail that works with the existing floor level.

Illustrative example: a stone threshing barn with two cart openings and a later lean-to. The statement retains both openings as glazed screens set 200mm back, adds two small openings on the rear elevation only, removes the lean-to, and defines a curtilage of gravel with a post-and-rail boundary 3 metres from the building. The structural appraisal confirms the walls take the roof loads with localised repair. Nine pages, granted without amendment. The covering letter that introduces a bundle like this is dealt with in our note on planning application cover letter structure.

Keep the statement proportionate. A rural conversion does not need a policy essay, and an officer who can read the argument and check it against the drawings in fifteen minutes is an officer who recommends approval.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. Enter the site postcode on PlanScope to see which documents a barn conversion is likely to need.