Removing internal walls in a conversion

Taking out an internal wall in an unlisted building needs no planning permission. Section 55(2)(a) of the Town and Country Planning Act 1990 puts works affecting only the interior outside the definition of development, so the planning system has nothing to say about an open-plan kitchen. Everything that does apply sits elsewhere: Building Regulations approval for the structural alteration, listed building consent if the building is listed, and a party wall notice if you are cutting into a shared wall.

Whether removal needs planning permission

For an unlisted building, no. The exclusion in section 55(2)(a) covers works which affect only the interior, or which do not materially affect the external appearance of the building, and wall removal falls squarely within it. A conservation area makes no difference to internal works either.

Two things change that answer.

If the works are part of creating additional dwellings, subdividing a house into flats or forming a self-contained annexe, that is a material change of use and needs permission regardless of how modest the building work is. The permission is for the change of use, not for the wall.

And if the building is listed, the interior is protected as part of the listing. That is the point where the criminal law arrives.

Load bearing identification and survey

Before anything else, establish what the wall is doing. Homeowners get this wrong in both directions, removing a load-bearing wall in the belief it was a partition, and paying for a beam over a stud wall carrying nothing.

Five indicators are worth checking together:

1. The direction of the floor joists above. A wall running at right angles to the joists is more likely to be carrying them.
2. Whether a wall sits directly above, on the next storey. A continuous line of wall through two floors is a load path.
3. The construction. Solid brick or block at 100 mm or more usually means structural, while a timber stud at 75 mm often does not, though studs can be load-bearing.
4. Whether the wall lines up with walls on other floors and with a foundation below.
5. What is in the roof. A wall supporting a purlin or a binder is structural even if it looks like a partition.

None of this substitutes for a survey. A Structural Survey or a structural engineer's inspection is the step that produces calculations a building control body will accept, and it also establishes whether the foundation under the new bearing points is adequate, which is the item most often missed.

Beam design, padstones and fire protection

The usual solution is a steel beam, sized by calculation, bearing on padstones at each end. Three details matter more than the beam section.

Bearing. The beam needs a defined bearing length onto a padstone of concrete or engineering brick, sized to spread the point load into masonry that can take it. A steel beam sitting on a single course of soft Victorian brick will crush it.

Load path continuity. The load has to reach the foundation. Where the wall below the bearing point is thin, or where a doorway sits beneath it, the pier needs strengthening or the load needs relocating, and that is an engineering decision rather than a builder's judgement.

Fire protection. An exposed steel beam in a dwelling normally needs encasing to achieve the required fire resistance period, usually with layers of plasterboard or an intumescent coating. This is the item most often left off a quotation and then argued about at completion.

Temporary propping before the wall comes out is a safety matter and a structural one. Needle beams through the wall, with props on spreader plates on a sound bearing surface below, and the props left in until the new beam is bedded and the mortar has gained strength.

Building control route and inspections

Removing a load-bearing wall is building work under the Building Regulations 2010, as a material alteration, and it must not leave the building less compliant than before with Part A on structure or Part B on fire safety.

There are two routes. A building notice, which suits straightforward domestic work and lets you start quickly with inspections as you go. Or a full plans application, where the engineer's calculations and details are approved in advance, which is slower at the start and smoother afterwards. For anything involving a party wall or an unusual load path, full plans is worth the delay.

Where the building is a higher-risk building under the Building Safety Act 2022 framework, the process is different again, with the Building Safety Regulator as the building control authority and its own gateway requirements. Do not assume the ordinary domestic route applies to a flat in a tall block.

Inspection points typically include the propping before removal, the bearings and padstones before the beam is loaded, and completion. Get the completion certificate. A retrospective regularisation certificate is obtainable but it is more expensive and it invites opening up finished work.

Fire safety deserves separate attention in a conversion to flats or a house in multiple occupation. An open-plan ground floor removes the protected escape route that the original layout provided, and the fire strategy has to compensate, usually through interlinked detection, sprinklers or a revised escape arrangement. Where the arrangement is unusual, a Fire Safety Strategy from a fire engineer is the right document, and fire engineering competence is legally the relevant qualification for it. The same logic applies below ground, as our note on safe egress from habitable basement rooms sets out.

Listed buildings and the consent position

For a listed building, internal walls are part of what is listed. Section 7 of the Planning (Listed Buildings and Conservation Areas) Act 1990 makes it unlawful to execute works for the demolition, alteration or extension of a listed building in a way that affects its character as a building of special architectural or historic interest, without consent.

Section 9 makes doing so a criminal offence. Not a planning breach to be regularised later, an offence, and the defence of not knowing the building was listed is narrow. Enforcement action against unauthorised works to a listed building is not subject to the time limits that apply to ordinary planning breaches.

What this means in practice for a landlord or investor is that plan removals room by room, with the consent application supported by a Heritage Statement explaining the significance of each element and the justification for its loss. Original plan form, cornices, chimney breasts and staircases carry the most weight, and a scheme that keeps the plan form legible while opening a secondary space is far more likely to succeed than one that hollows out the ground floor. The stability issues that come with removing historic fabric are covered in our piece on chimney removal and stability in conservation areas.

Party wall consequences

Cutting a beam bearing into a party wall engages the Party Wall etc. Act 1996. Section 2 lists the works an owner may carry out to a party structure, including cutting into it to insert a beam, and section 3 requires a party structure notice to be served on the adjoining owner.

The notice period is two months for section 2 works, and the adjoining owner may consent, dissent or do nothing. Silence counts as dissent after fourteen days, which triggers the appointment of surveyors and an award.

Build the two months into the programme. A contractor arriving to find no award in place is an expensive standstill, and proceeding without one exposes the building owner to an injunction. Take a schedule of condition of the neighbour's rooms before work starts, because a plaster crack claim without one is very hard to resist.

Records to keep for resale

Conveyancing enquiries on structural alterations are standard, and a missing certificate can delay or reprice a sale.

Keep six documents together in one file: the structural engineer's calculations and details, the building control approval or building notice reference, the completion certificate, the party wall award and schedule of condition where one applied, the listed building consent where relevant, and photographs of the bearings and padstones before they were covered.

Add the beam's fire protection specification. It is the detail a surveyor will ask about, and it is invisible once the plasterboard is on.

This article is general guidance, not legal advice; the position on listed buildings, party walls and building control turns on the specific facts, so check with your local planning authority, your building control body and 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.

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