What an Article 4 direction does to a conversion appraisal

An Article 4 direction removes a permitted development right in a defined area, so a conversion that would have run through a prior approval notification becomes a full planning application decided against local plan policy. The Article 4 direction appraisal impact is therefore not one line for a bigger fee. It changes the consent route, the evidence you have to buy, the programme, the probability of consent and, through all four, the price you can afford to pay for the building.

Article 4 directions are made under Article 4 of the Town and Country Planning (General Permitted Development) (England) Order 2015. The two that matter most to conversion investors are directions withdrawing Class MA, which allows commercial to residential change of use, and directions withdrawing the Class L change from a dwellinghouse to a small house in multiple occupation.

What changes about the route

Under permitted development you give the authority a prior approval application and it may only consider the matters the relevant class lists. Those matters are closed. For Class MA the authority looks at transport and highways impacts, contamination, noise from commercial premises, natural light to habitable rooms, and in some cases the impact of the loss of the ground floor use. It cannot refuse because the scheme provides no affordable housing or because the design is poor.

Once the right is withdrawn, the whole development plan applies. Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires the determination to be made in accordance with the development plan unless material considerations indicate otherwise, so every policy on housing mix, amenity standards, affordable housing, employment land protection, parking and design becomes live.

That is the single most important consequence and it is easy to understate. The question moves from "does the building satisfy five tests" to "is this the right use of this building in this location according to the adopted plan".

Fee and programme

The application fee moves from the prior approval fee to the fee for a full application for change of use, which is calculated differently and is higher. National fee figures are indexed annually, so take them from the current fee schedule rather than from an older appraisal template, and check our note on how planning fees are indexed each April before you set the budget line. Where floorspace or site area drives the calculation, the working in full application fees by floorspace and site area shows how the bands apply.

Programme is the larger cost. A Class MA prior approval has a determination period of 56 days, after which the development is treated as having prior approval if the authority has not responded. A full application for a minor development has a statutory period of eight weeks with no deemed consent, and extensions of time are common where consultees are involved.

Add the time to prepare the fuller submission and the realistic difference between the two routes on a small scheme is three to five months. On a bridging facility that is the difference between a viable deal and a loss.

Evidence the application will now need

The prior approval route needs little more than floor plans, a transport note, a contamination screen, a noise assessment where a commercial neighbour exists and a daylight study for habitable rooms. A full application needs the policy case made.

Expect to produce a planning statement setting out the development plan policies and why the proposal accords with them, including the case on loss of the existing use. A design and access statement where the authority's validation list requires one. A daylight and sunlight assessment to the current BRE guidance rather than a simple natural light check. A noise assessment where plant or neighbouring uses affect the units. And in most urban conversions a parking survey, because a car free scheme has to be justified with evidence of on street capacity rather than an assertion.

Where the direction withdraws the small house in multiple occupation right, the submission usually also needs a layout showing room sizes against the authority's adopted standards, bin and cycle storage, and often a statement on the concentration of similar properties in the street where the local plan has a threshold policy.

None of that is unusual work. It is simply work that the permitted development route did not require, and each item is a fee line and a lead time.

Refusal risk and the appeal option

The honest position is that refusal risk rises and is hard to quantify in advance. A prior approval is a test against a closed list and a competent submission usually passes. A full application in an Article 4 area is being judged against policies the authority adopted precisely because it wanted to control this type of conversion.

Two things reduce the risk. A pre-application enquiry, priced from the authority's published charges, gives a written officer view before you commit. And reading the authority's recent decisions on comparable conversions in the same area tells you more than any policy summary, because it shows what the case officers have actually accepted.

Appeal is available and costs money and time. For a non-householder refusal the appeal must be made within six months of the decision, and written representations appeals take months to determine. Treat an appeal as a fallback with its own budget rather than as part of the base case.

What this does to the price you can pay

Work the direction through the appraisal in four places rather than one.

1. Professional fees and the application fee, which rise by the cost of the extra documents.
2. Finance cost over the longer consent period, which on a 12 month facility is often the largest single item.
3. A probability weighting on consent, or a contract structure that puts the planning risk on the vendor.
4. Exit value, where policy compliance may require larger units, more amenity space or fewer bedrooms than the permitted development scheme assumed.

The fourth is the one people miss. If the authority's space standards require a one bedroom flat of 50 m² and the permitted development scheme worked at 37 m², the unit count falls and the gross development value falls with it. That is a scheme change, not a fee change.

A conditional contract with a planning condition is the usual answer where the direction is in force and the appraisal is marginal. Price the option fee against the cost of the planning exercise and be willing to walk away.

Checking before you offer

Article 4 directions are published by the authority making them and are also recorded as a national dataset on the planning data platform. Neither source is a substitute for the authority's own map, because directions are amended and new ones are confirmed regularly.

Three checks, in this order. Search the authority's planning policy pages for Article 4 directions and download the map and the direction itself, because the wording states exactly which class and which area are covered. Confirm the date the direction took effect, since directions withdrawing rights are usually confirmed after a notice period and compensation under section 108 of the Town and Country Planning Act 1990 can be relevant where a right is withdrawn with less than 12 months notice. Then check whether the building's lawful use is what you think it is, because Class MA depends on the premises having been in a qualifying use for a continuous period before the application and on a vacancy test.

Do all three before the offer rather than during due diligence. A direction found after exchange is a repricing conversation you will lose. The full list of report types gives the scope of the documents the full application route pulls in, and PlanScope pricing sets out the one free report, £50 per report and the £150 per month Professional tier for agents handling several appraisals at once.

This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. A Lawful Development Certificate is the only formal way to confirm that works or a use are lawful. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.