How to get planning permission for modular classrooms

A modular classroom is a building, and in planning terms it is treated as one whether it stays for three years or thirty. Schools have limited permitted development rights for extra accommodation within their own grounds under Part 7 of the General Permitted Development Order 2015, but those rights are capped by floorspace, height and distance from the boundary, and a bank of four classrooms on a primary school field usually exceeds them. The realistic route for most schemes is a full planning application, often for a temporary period.

Governors and business managers tend to arrive at this late, with a September deadline and a summer holiday to build in. The programme that works backwards from that date has to allow eight weeks for determination on a minor application, several weeks before it for consultation with Sport England if a playing field is affected, and time to get a travel plan and a drainage position agreed. Start in the autumn term for the following September.

Which route the building takes

Part 7 of Schedule 2 to the General Permitted Development Order 2015 allows schools, colleges and universities to put up new buildings and extensions within the curtilage of the existing school, subject to limits on cumulative floorspace, on height, and on how close the building can sit to the boundary of the curtilage. The rights also fall away on land used as a playing field and where the building would sit in front of a principal elevation. Read the current text of the class rather than a summary, because the limits have been amended more than once.

Where the scheme fits, a prior approval application still has to be made on the matters the class specifies, and the council can refuse on those grounds. Where it does not fit, the application is an ordinary full planning application. In practice many schools apply fully even when the rights might cover the work, because a planning permission is easier to explain to a funder and to a future purchaser than a prior approval that depends on cumulative floorspace calculations going back to 1988.

Temporary permission and how it is conditioned

Section 72 of the Town and Country Planning Act 1990 lets the council grant permission for a limited period. Temporary consents for modular accommodation are common, and they are usually written as a permission expiring on a stated date with a condition requiring the buildings to be removed and the land restored.

The Planning Practice Guidance on the use of planning conditions is blunt about one point: a temporary permission cannot be justified simply because the building is of temporary construction. The justification has to be about the use or the circumstances, such as a bulge in the roll, a decant during a rebuild, or a trial of a new provision. Applications that say "these are portable buildings" and stop there are the ones that attract a refusal or a one-year consent when the school needed five.

Where the need is long term, ask for permanent permission and design the building accordingly. Re-applying every three years costs fees, officer time and goodwill, and each renewal is judged against whatever the local plan says by then.

Playing fields and Sport England

If any part of the development would sit on, or affect the use of, a playing field, the council must consult Sport England as a statutory consultee under the Development Management Procedure Order 2015. That consultation is mandatory and it cannot be shortcut by arguing that the grass in question is never used for organised sport.

Sport England's published playing fields policy starts from a presumption against development that leads to the loss of playing field land, and sets out a small number of exceptions, including replacement of equivalent or better quality and quantity, development of ancillary facilities supporting the sporting use, and development affecting only land incapable of forming part of a playing pitch. The application needs to identify which exception is relied on, with a pitch layout plan showing the field before and after.

The practical answer on a constrained site is often to place the modular block on hardstanding, on a redundant tarmac area or on the footprint of a demolished building, and to show a marked-up pitch plan proving no pitch is lost. That single drawing resolves more objections than any amount of narrative.

Traffic at the school gate

Extra classrooms mean extra pupils, and the highway authority will want to know what happens at 8:45am. For most school expansions a Travel Plan is the document that carries the weight, setting out current mode share from a pupil survey, targets, measures and a monitoring regime with a named coordinator.

Where the increase in roll is small and the site has no history of highway problems, a short transport note may satisfy the highway officer. Where the school sits on a classified road or the roll increase is substantial, expect a request for junction capacity work and a survey of parking and queuing on surrounding streets. Do the survey in a neutral term-time week, avoiding the first and last weeks of term and any period of school holidays elsewhere in the county.

Measures that councils take seriously include a School Street closure at drop-off and pick-up, secured cycle parking to the standards in the local plan, a staggered start for the year groups using the new block, and a park-and-stride arrangement with a nearby car park. Measures that impress nobody include a leaflet to parents.

Noise, hours and community use

Modular buildings on a boundary raise two separate noise questions. One is noise reaching the classroom, which is a Building Regulations and acoustic design matter measured against the Department for Education's acoustic standards. The other is noise from the school reaching neighbours, which is the planning question.

Where the block sits near houses, expect conditions on hours of use, on the use of any external play area serving it, and on plant such as air source heat pumps or ventilation units. A Noise Impact Assessment is usually only needed where plant is proposed close to a residential boundary or where the school intends evening community lettings. If community use is part of the case for the scheme, say so in the application and offer a management plan, because a condition restricting use to school hours is otherwise the default.

Drainage and the surface being lost

A modular classroom replaces grass with a roof and a slab. Even at a small scale that changes where surface water goes, and councils now ask the question routinely.

For anything beyond a single unit, a Drainage Strategy showing the discharge hierarchy, from infiltration first through to a restricted discharge to sewer as a last resort, is the proportionate answer. Where the site exceeds one hectare, or the development is major, the lead local flood authority becomes a statutory consultee and the expectations rise accordingly. Confirm the flood zone on the Environment Agency flood map for planning before you scope anything.

Blocked or overloaded school drainage is a recurring complaint from neighbours, so a strategy that shows attenuation and a calculated discharge rate rather than a note saying "connect to existing" is worth the fee.

The documents to submit

A typical application for a modular block on an existing school site contains a site location plan and block plan, existing and proposed floor plans and elevations, a Planning Statement setting the scheme against the adopted local plan policies on education and community facilities, a Design and Access Statement covering appearance, layout and inclusive access, a travel plan or transport note, a drainage position, a pitch plan where playing fields are affected, and a tree protection plan if any tree is within influencing distance.

Schemes for other community buildings follow a similar shape, and the approach set out in the guide to getting permission for a community sports pavilion transfers well to a school site.

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.