Home working, home businesses and the planning unit

Working from home almost never needs planning permission. Running a business from home sometimes does, and the line between them is not about whether you are paid. It is about whether the use of the property has changed in character.

The legal test comes from section 55 of the Town and Country Planning Act 1990. Development includes a material change in the use of a building or land, and whether a change is material is a question of fact and degree, decided on what is actually happening rather than on job titles.

When home working becomes a change of use

Ask one question. Would a reasonable neighbour notice that this house is being used differently from the other houses in the street?

A consultant answering emails in a spare bedroom does not change the character of the dwelling. A dog grooming business with eight clients arriving by car each day does. Between those two extremes sits everything that councils actually get asked about.

The residential use has to remain the primary use. Where a business use grows to the point that the property is in reality used for two purposes, the position becomes a mixed use, and a mixed use of a dwelling and a business is a material change requiring permission.

The factors a council weighs

No single factor decides it, and councils assess them together.

• The proportion of the house given over to the business, and whether any part is used exclusively for it.
• Whether customers, clients or pupils visit, how many, and how often.
• Deliveries and collections, particularly by vehicles larger than a car or a van.
• Employees who do not live at the property.
• Noise, fumes, dust or smells that would not arise from a normal household.
• Hours of activity, especially early morning or evening.
• Vehicle movements and parking pressure on the street.
• Any external change, including signage, storage or a trade vehicle parked on the frontage.

Two of these carry more weight than the rest in practice. Visitors and vehicle movements are what neighbours notice and report, and they are what an enforcement officer can evidence on a site visit.

Scale matters more than sector. A piano teacher with two pupils a week and a piano teacher with twenty are treated differently, and neither is decided by the fact that music lessons are being given.

The planning unit question sits underneath all of this. Where part of a property is used solely for a business, physically separated and functioning independently, a separate planning unit can come into being, and at that point the comparison is no longer with the house as a whole. A converted garage with its own entrance, used only for the business, is the classic example.

Outbuildings used for business

This is the most common mistake, and it is expensive because a building has usually been built before anyone asks.

Permitted development for outbuildings under Class E of Part 1 requires the building to be used for a purpose incidental to the enjoyment of the dwellinghouse. Running a business is not incidental, whatever the building looks like.

So a garden office built under permitted development and then used as the base of a business may fall outside the permitted development right entirely, which means the building itself is unauthorised as well as the use. The threshold is examined in more detail in the note on when a garden office stops being incidental.

The practical position is softer than the legal one. A householder who sits in a garden room doing the same laptop work they could do at the kitchen table is not usually of interest to anyone. A garden building with clients arriving, stock stored and a sign at the gate is a different proposition.

If the building matters financially, apply for a lawful development certificate for the proposed use. It is the only formal way to confirm that works and uses are lawful, and it gives you a document for a future buyer or lender.

Customers, deliveries and signage

Each of these can turn an unremarkable home business into a planning issue on its own.

Customer visits generate parking demand in streets that have none to spare, and a pattern of arrivals and departures is easy for an objector to log. Where visits are part of the model, think about where people will park before you think about anything else.

Deliveries by heavy goods vehicle are almost always fatal to an argument that nothing has changed. A weekly pallet delivery to a residential street is the kind of fact that decides an enforcement case.

Signage is controlled separately under the advertisement regulations. A small professional nameplate may benefit from deemed consent, while an illuminated or larger sign will need express consent. Check the current regulations rather than assuming that a modest sign is always acceptable.

Where a mixed use permission is the answer

Sometimes the honest answer is that permission is needed, and applying is better than waiting to be asked.

A mixed use permission for a dwelling and a business gives certainty, and it can be shaped by conditions you help draft. Typical conditions limit the hours of operation, the number of visitors in any day or week, the number of non-resident employees, the parking of commercial vehicles, and the storage of materials outside.

Councils sometimes grant a personal permission, tied to the named occupier, or a temporary permission for a trial period. Both are common on home business applications and both are a reasonable outcome where the officer wants to see how the use behaves in practice.

Put the operating detail in the planning statement rather than leaving it to be inferred from the form. Visitor numbers, hours, deliveries and parking arrangements stated plainly are what allow an officer to impose workable conditions instead of refusing.

Staying within the incidental limits

If you would rather not apply, keep the use inside the boundaries that make it plainly ancillary.

Keep the primary use residential in both fact and appearance. Avoid regular client visits at the property, meeting elsewhere where you can. Take deliveries by ordinary carrier rather than by commercial vehicle. Do not store trade materials or stock in the garden or the drive. Keep working hours within the pattern of the street, and do not sign the property.

Enforcement time limits were extended by the Levelling-up and Regeneration Act 2023, so the idea that an unauthorised use quietly becomes lawful after a few years is now less reliable than it was. Check the current position before relying on immunity.

Business rates are a separate question decided by the valuation office, not the council's planning team, and a room being rated for business use is not by itself proof of a material change of use. It is, however, the kind of fact that gets mentioned in a complaint.

If the business has outgrown the house, the report pages under planning documents set out what a change of use application usually needs, and you can enter your postcode to see which reports a specific site is likely to require.

This is general guidance, not legal advice. Whether a particular use is a material change of use turns on the facts, so 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.