Can you get a whole house plan if you own a flat?

What changes is the scope of the plan and the permissions behind it. A flat owner controls the inside of the flat and, usually, nothing else. Roof alterations under permitted development are excluded where the building contains one or more flats, or where the property is a flat within such a building³, and the permitted development rights that houses rely on for many common projects do not apply to flats, maisonettes or other buildings⁵. A plan for a flat is therefore a plan for a dwelling inside a larger structure, and it has to say so.

What a whole house plan covers in a flat

A whole house plan is a document about a dwelling: how it loses heat, how it is heated, what could be improved, in what order, and what each measure would cost. The Welsh Government's description of the contents is the clearest statement of what a householder receives: impartial, scientific recommendations with detailed costings, architectural drawings and scheduling options¹. Tameside Council's advice pages describe the same service in plainer terms, with experts delivering a "whole house" assessment and a bespoke plan for homeowners².

For a flat, the assessment is bounded by the flat's own thermal envelope and services. That still leaves a substantial list: the walls between the flat and the outside, the windows, the doors, the heating system and its controls, ventilation, draughts, and the appliances. It also leaves the flat's position in the building, which matters more than it does in a house. A mid-floor flat with neighbours above, below and to both sides has far less exposed fabric than a top-floor or end-of-terrace flat, and the plan should reflect that.

The plan is also the natural place to record what falls outside the flat owner's control. Where a measure touches the roof, the structure or a shared service, the plan can note it as a building-level item rather than a flat-level one. That distinction is what makes a flat plan usable: it separates what can be done now from what needs a conversation with the freeholder or management company.

The wider policy context is that whole house planning sits inside a collection of new and existing schemes, including the Warm Homes: Local Grant, Warm Homes: Social Housing Fund and Boiler Upgrade Scheme, alongside plans for consumer loans for home retrofits and investment in the retrofit supply chain¹⁰. A flat owner commissioning a plan is working to the same method as a house owner, on a smaller and more constrained canvas.

What changes when you do not own the whole building

The single biggest difference is planning. Permitted development rights that apply to many common projects for houses do not apply to flats, maisonettes or other buildings⁵. Roof alterations are excluded where the current house is a building containing one or more flats, or a flat contained within such a building³, and the same exclusion applies to adding storeys under permitted development¹¹. Where the limits and conditions are not met, or permitted development rights have been removed in the area, a householder or full planning application is required³.

That has a practical consequence for sequencing. A house owner can often proceed on permitted development and notify afterwards. A flat owner frequently cannot, and the planning application becomes a step in the programme rather than an afterthought. Where the work affects flats, more than one house, or a change of use, householder planning consent does not apply and a full planning application is necessary¹².

There is a second difference in how the building is treated as a whole. Scottish Government consultation material on energy efficiency programmes records that a house in a flat in a tenement does not fail the repairing standard if work cannot be undertaken because the majority of owners refuse consent¹³. That is a Scottish provision, and it illustrates the general problem: in a building with several owners, one refusal can stop a shared measure. A flat-level plan avoids most of that exposure by concentrating on what one owner can deliver alone.

Which improvements work in a flat, and which do not

The measures that work well in a flat are the ones inside its own envelope. Draught-proofing, secondary or replacement glazing where the leaseholder controls the windows, heating controls, a more efficient boiler or a heat pump serving the flat, hot water cylinder insulation where there is a cylinder, and lighting and appliance upgrades all sit within the flat. Loft insulation is described as a simple and effective way to reduce heating bills that a householder can even install themselves¹⁵, though a flat rarely has a loft within its own demise.

Air source heat pumps are eligible for permitted development where the proposed unit is located within a dwelling house, block of flats or their curtilage; non-domestic units need a planning application¹⁶. That wording matters for flats, because it contemplates a unit within a block of flats or its curtilage rather than only a house.

Solar is the measure where the guidance diverges most. Wirral Council states that placing solar panels on the roof of a house or flat, or on a building within the grounds, is considered in most cases permitted development under the Town and Country Planning (General Permitted Development) (England) Order 2015, Schedule 2, Part 14, Class J¹². West Suffolk Council states that placing solar panels on the roof of a house or flat, or a building within the grounds, is in most cases permitted development, whether in a conservation area or otherwise¹³. Cornwall Council states that homes can often have solar panels without planning permission, covered by permitted development so long as certain conditions apply¹⁷. Against that, Welsh Government guidance states that these permitted development rights apply to houses, and that a flat resident considering solar panels should contact the local planning authority⁷. Where a trigger applies, a stand-alone solar installation needs full planning permission for flats, or householder planning permission for houses¹².

In England, the council guidance above reads the right as covering flats. In Wales, the national guidance confines it to houses and directs flat residents to ask. A flat owner in England still faces the practical questions of roof access, the freeholder's consent and whether the roof is within the lease demise, none of which planning permission answers.

Leaseholders, freeholders and who signs off the work

A leaseholder may need permission from the landlord, freeholder or management company before work goes ahead¹⁷. That is separate from planning permission and separate again from building control. Planning permission or listed building consent may be required if the property is a flat or maisonette, a listed building, or in a conservation area, especially where changes affect external appearance¹⁸.

The decision on whether to proceed always rests with the owner commissioning the work. Development Bank of Wales guidance on choosing a retrofit coordinator states that the end decision on whether or not to go ahead with any work will always lie with the homeowner¹⁹. For a leaseholder, that decision is bounded by the lease and by the freeholder's consent, but the choice of measures and the choice of contractor remain with the person paying.

Where a scheme provides funding, ownership status is checked. The Boiler Upgrade Scheme requires that a self-build property must not have been owned, at any stage during construction or afterwards, by a company or other non-individual, with ownership resting with an individual²⁰. That is a self-build rule rather than a flat rule, but it shows how grant schemes test ownership rather than occupancy.

For planning applications, a certificate of ownership is required, usually Certificate A for a sole owner or Certificate B where there are other interested parties, which is the position for leaseholders⁹. For the Nest scheme in Wales, owner-occupiers provide one of a mortgage statement, buildings insurance policy or property deeds as evidence of ownership²². Swansea Council's private sector housing policy allows a loan to be used with the intention of renting or selling the property, subject to planning and building regulations consent where applicable, and requires full repayment of the loan or grant if conditions are breached, with discretion to agree a lesser amount in exceptional circumstances such as significant financial hardship or a deficit estate²³.

Who applies when the building has several flats

Each flat owner can commission a plan for their own flat, and each can apply for consent for work confined to that flat. The position changes as soon as the work touches shared parts or more than one home. Householder planning consent does not apply to applications affecting flats, more than one house or changes of use, and a full planning application is necessary for those¹².

That means a block-wide retrofit is a different kind of project from a flat-level one. It is usually led by the freeholder, a residents' management company or the local authority, and it is assessed as a single building. Edinburgh Council's High Rise Retrofit and Upgrade Programme Phase 1 shows how that is done at scale: the energy strategy for each design commission uses the Passive House Planning Package (PHPP) as its energy modelling tool²⁴. A householder commissioning a plan for one flat is working at a different level of granularity, but the same principle applies, that the unit of assessment should match the unit of work.

Where several owners want to act together, the practical route is a single coordinated plan for the building, with each owner's contribution and consent recorded. Where they do not, the flat-level plan remains valid and deliverable on its own.

How a flat plan fits into household energy independence

A flat can move a long way towards energy independence within its own walls, and no further. The measures that reduce demand, such as draught-proofing, glazing, controls and insulation where the fabric is exposed, reduce the amount of energy the flat needs to buy. A heat pump or a more efficient boiler reduces the carbon and cost of what remains. Solar and storage, where the roof is accessible and consent is available, reduce reliance on imported electricity during daylight hours.

What remains is dependence on the building. The flat sits inside a structure it does not control, on a roof it may not own, with shared services it cannot alter alone. It remains connected to the grid and to a supplier, and where the heating is communal or the building is on a district system, the flat owner may have no choice of supplier at all. A whole house plan for a flat should state that boundary plainly, because a plan that assumes control of the roof or the structure is not a plan the owner can deliver.

The regulatory direction of travel is towards whole-building performance. Approved Document L requires that a new dwelling's primary energy rate, emission rate and fabric energy efficiency rate must not exceed their respective target rates²⁵. The Future Homes Standard will launch with only SAP 10.3 available, with the Home Energy Model approved as an alternative once it meets the full criteria required of an approved calculation methodology²⁶. Those are standards for new dwellings rather than retrofit plans, but they set the direction: performance is assessed for the dwelling, and for a flat the dwelling is the flat.

For a householder, the practical meaning is that a flat plan is worth having and worth following, provided it is honest about the split between what the flat owner controls and what the building controls. The measures inside the flat are the ones that can be delivered without waiting for anyone else.