Demolition Work: cost of demolition per m² and m³ 2026, process and waste removal

Before you take the first swing at a wall, you need to know whether it is load-bearing or bracing. A bracing wall may not hold up the ceiling, but it keeps the building stiff and stops the structure from twisting. A popular rule of thumb says a thin wall is a partition and a thick one is load-bearing. You cannot rely on it. In concrete panel blocks, walls that look like ordinary partitions often brace the structure. In older houses, a thin brick wall sometimes carries the floor above, or someone later rested joists on it without anyone noticing.

The building's drawings and an assessment by a structural engineer give you a reliable answer. The engineer also looks at what the neighbours above and below you have already changed. Every alteration to the structure adds up, and something harmless on its own can cause trouble once it is combined with other changes. If you live in a block of flats, you must agree any work on load-bearing structures with the building management or the owners' association. You will usually also need approval under local building regulations. Ask your local building authority in advance which procedure applies to your case, and do not assume that a simple notification is enough. If the wall is shared with a neighbouring property, some countries also require you to give your neighbour formal notice before you start, so check the local rules on shared walls too.

If a load-bearing wall comes out completely or you want a larger opening in it, the structural engineer designs what will take over the load. This is often a steel beam or a precast lintel. The engineer also specifies how the ceiling must be propped during the works, usually with adjustable steel props, so that nothing moves before the new support is in place.

Walls and floors hide electrical cables, water pipes, drainage and sometimes gas. Before you start, switch off the circuit breakers for the circuits involved and shut off the water. Never disconnect gas yourself: this must be done by a qualified, registered gas engineer. If you smell gas during the work, stop immediately, do not switch any electrical appliances or lights on or off, open the windows, leave the property and call the local gas emergency number or 112.

Trace the routes of cables and pipes with a detector and mark them on the wall in pencil or marker. In older flats and houses you cannot count on cables running straight up and down or level across. In practice it often happens that a cable turns up running diagonally across the middle of a wall, exactly where nobody expected it.

Demolition works from the top down, in small pieces. Why not push the whole wall over at once? A large chunk of masonry falling in one go damages the floor and the services in it, and in a panel block it can even crack the tiles in the flat below. In a block of flats, find out before you start where the risers run and where their shut-off valves are, so you can turn the water off quickly if something goes wrong.

Breaking and chiselling concrete, brick and plaster produces fine dust that contains quartz (crystalline silica). Breathed in over a long period, it damages the lungs. So wear a respirator with a high protection class, seal off the work area with plastic sheeting and tape up the doors to other rooms. When cutting, use water or tools connected to a dust extractor that removes the dust right where it is created.

When you are allowed to make noise is set by the house rules of your building and by local regulations. They tell you on which days and at what times noisy work is permitted. Let your neighbours know in advance when you will start and how long it will take. Most people put up with noise far more easily when they know what to expect. Protect the hallway, staircase and lift from dust and knocks. If anything in the common areas is damaged, the person who ordered the work is responsible for it.

Some panel blocks have prefabricated bathroom pods with laminate panels. These come apart step by step: first the sanitary fittings, meaning the bath, basin and toilet, then the tiles and the pod panels, and the floor goes last. The risers and shut-off valves must keep working until the plumber replaces or reconnects them. Many people are surprised how much material comes out of a single pod. It usually fills a whole skip.

Under floor tiles you will often find another layer of old tiles, a thick cement screed or floor layers containing clinker or ash. How much really has to come out only becomes clear after a test opening, a small trial hole in the floor. With wall tiles, decide whether you will remove just the ceramics or the plaster behind them as well. If the plaster comes away with the tiles, the wall will need replastering.

Ash and clinker fill in old buildings

In older brick buildings, clinker and coal ash were used to fill ceilings and floors, often between the joists as sound insulation (known in the UK as pugging). It is heavy, dusty, often damp and may contain harmful substances left over from burning coal. Wear a respirator when you remove it and keep dampening it so it does not raise dust. How it should be disposed of depends on what an assessment of the material shows. If you are taking it out of a timber ceiling, be careful not to damage the boards laid over the joists, or the joists themselves.

Buildings constructed or refurbished before roughly the year 2000 may contain asbestos, and the older the building, the more likely it is. Typical places are asbestos cement slates and corrugated sheets on roofs, facade cladding, drainage risers in some panel blocks, old floor tiles and coverings, pipe and boiler insulation, insulating boards and some textured wall and ceiling coatings. As long as asbestos material is intact, it is relatively safe. The danger comes from fibres released when it is broken, cut or sanded, which then end up in the lungs.

Asbestos may only be removed by a company licensed or approved for this work. It seals off the work area, dampens the material, takes it down in whole pieces where possible, packs it in labelled bags and takes it to a hazardous waste site. Anyone who simply smashes an asbestos roof or riser during a renovation and throws it in a skip breaks the law and puts the health of the workers and everyone living in the building at risk. If you are not sure whether a material contains asbestos, have it tested or surveyed by a professional before demolition starts.

Broken material bulks up, so it takes up more space than the original wall. It is also heavy: a cubic metre of concrete weighs roughly more than two tonnes. That is why skips have a weight limit as well as a volume limit. With concrete it often happens that the skip is full by weight while it still looks half empty. When you plan the removal, think in terms of weight, not the number of bags.

If the skip has to stand on a public road or pavement, you will usually need permission from the local council, which the skip hire company can often arrange. Sorting the waste pays off. Clean concrete and brick are easier to recycle than mixed waste containing timber, plastic, plasterboard and insulation. Metals can go to a scrap collection point. Keep the waste transfer notes or receipts, as the building authority asks for them on some projects.

Breaking out with a demolition hammer is fast, but it comes at a cost. The vibration travels through the whole structure, cracks the surrounding plaster and tiles, and in load-bearing elements it can weaken the masonry or concrete. Openings in concrete, load-bearing walls and panels are therefore made by diamond wall sawing or core drilling. The cut is accurate, there is no vibration and less dust. The edges of the opening stay straight, so they do not need repairing afterwards.

A chimney is taken down by hand from the top downwards, so that debris does not fall into the flues or onto the roof. Before removing a chimney, check that no other flat or appliance still uses it. Once it is down, the opening in the roof must be closed and properly sealed, otherwise rain will get into the house.

You can remove old ceramic tiles in a bathroom or kitchen yourself, as long as you are not knocking down walls or touching the services. It takes patience and good protection.

1. Switch off the circuit breakers for the room, shut off the water and remove sockets, taps and accessories.
2. Cover the floor with thick cardboard or boards and tape plastic sheeting over the door to keep the dust in.
3. Put on safety glasses, gloves, a respirator and work boots with firm soles.
4. Start at the top edge of the tiling or at a corner where a tile comes loose most easily, and drive the chisel flat under the tile, not straight into the wall.
5. Use an electric chipping hammer with a flat chisel, or a hand chisel and hammer. On a hard wall, work slowly so the plaster does not break away in large pieces.
6. Collect the debris as you go in strong bags and do not overfill them, so you can still carry them.
7. Once the tiles are off, knock away loose plaster and leftover adhesive so the surface for the new tiles is sound.
8. If a cable or pipe appears somewhere you did not expect it, stop work and call a professional.

• The demolition matches the agreed scope and load-bearing structures are untouched or secured as specified by the structural engineer
• Services that were meant to stay are undamaged and their open ends are capped and secured
• The rubble has been removed and you have the waste transfer notes or receipts
• The common areas of the building are clean and undamaged
• The surfaces are ready for the next trades, with no loose plaster or adhesive left