Partial demolition and reconstruction of houses and buildings

What is partial demolition?

Partial demolition is the removal of a specific part of a building – structural or not – while the rest of the building is kept. It sits between an interior strip-out, where the shell stays intact, and a total demolition, where nothing stays. On houses and villas in the province of Málaga the most frequent cases are:

• an extension, garage or annex added over the years, often of poorer construction than the original house;
• a wing of a villa that is to be rebuilt with a new layout;
• an upper floor or a roof that is replaced to add height, change the shape or end persistent leaks;
• porches, covered terraces and pergolas built in masonry;
• the damaged part of a building after a partial collapse – see emergency and unsafe buildings.

If what you need is the removal of internal walls, kitchens or bathrooms with the shell untouched, that is interior demolition, covered by our sister site for wall removal in Málaga.

Why the part that stays decides the method

On a partial demolition the hardest work is not what comes down but what stays up. The retained structure has to remain stable during and after the demolition, and that is a technical decision before it is a practical one.

Your técnico defines where the cut line runs, which walls or beams have to be propped or reinforced first, and in which order the elements are removed. With that definition, the work is organised in two zones:

The edges left by the demolition – wall ends, exposed slab edges, the line of the old roof – are left clean and, where the técnico requires it, protected from rain until reconstruction begins.

Do I need a permit for a partial demolition?

Yes, a partial demolition needs the same municipal route as a total one. In Andalusia, since Decreto-ley 3/2024, the total or partial demolition of buildings is carried out by declaración responsable, unless the building has heritage protection or lies in a protected setting or archaeological zone, where a licence is still required.

In Málaga city the OMLU ordinance asks, for partial-demolition licences, for a nota simple from the land registry less than three months old, in addition to the general documents. In other municipalities, each ayuntamiento sets out the documents and deadlines in its ordinance; consult your técnico or the town hall. The documentation itself – project or technical report, health and safety study and waste management study – is signed by a técnico competente.

When the partial demolition is the first phase of a reconstruction, the paperwork is often prepared together with the new works; how that is done is for your architect. The differences between full and partial demolition for permits and works are compared in full vs partial demolition: what changes, and the roles are explained in who signs a demolition project in Spain.

Partial demolition in a community of owners

Many partial demolitions on the coast happen in townhouses, semi-detached villas and apartment buildings under propiedad horizontal. There, Ley 49/1960 applies: before demolishing walls, structure or façade elements, the community must be informed, and works affecting common elements need the agreement of the owners' meeting.

In practice, that means talking to the community administrator early, especially if the part you want to remove touches a shared roof, a party wall, a façade or a shared terrace. We coordinate dates and access with the administrator once the agreement is in place, and we document the condition of the common elements with photos before starting. Our page on managing demolition from abroad explains how that coordination works when you are not in Spain.

Partial demolition and reconstruction: lining up the two phases

A partial demolition is almost always followed by building work, so the end of one phase should hand over cleanly to the start of the next. What helps:

• Agree the handover state. Which slab edges, wall ends and reinforcement have to be left exposed for the new structure, and which are cut back.
• Protect the house. Temporary covers on openings and on the line of the old roof if there is a gap before reconstruction.
• Keep what you want to reuse. Old roof tiles, beams, doors or ironwork are set aside during the strip-out.
• Share the programme. We give your architect and builder our dates so that the new works can follow on.

If, during the planning, it turns out that more of the house would have to go than expected, it is worth comparing with a total demolition; renovate or rebuild helps with that decision, and house and villa demolition describes the full option.

Waste from a partial demolition

A partial demolition produces less waste than a total one, but often in a more awkward place – behind the house, on a terrace, at the end of a narrow garden. The rubble is sorted into the same fractions as on any demolition, moved to the loading point by small machine or by hand, and taken to an authorised facility; you receive the delivery receipts.

If the building's roof or any annex is asbestos-cement, that part is removed first by a RERA-registered company working as our subcontractor. The rest of the waste chain is described on demolition and debris removal, and the legal background in selective demolition under Law 7/2022.