Demolition covers everything from removing a single internal wall to clearing a full property ahead of a rebuild, and getting the scope, notices and safety checks right matters as much as the physical work itself. In London in 2026, demolition costs typically range from around £1,000 for a small garage to £25,000 or more for a full house, depending on size, access and what the structure is made of.
At a glance
- Full house demolition: £8,000 to £25,000+, depending on size, terrace type and access
- Partial or internal demolition: £1,500 to £8,000, for load-bearing walls, chimney breasts or internal reconfiguration
- Garage or outbuilding demolition: £1,000 to £4,000, depending on construction and attachment to the house
- Typical timeline: 4 to 10 days on site for the physical works, though a full project including notices often runs 8 to 12 weeks
- Regulatory: most full demolitions need a Section 80 notice to the council, and terraced or semi-detached properties usually need a party wall agreement
Types of demolition work
Not every demolition project looks the same, and the right approach depends on what is coming down, what is staying up next to it, and what happens on the site afterwards.
Full property demolition
Complete removal of a house or building down to ground level, including walls, roof and foundations, typically ahead of a new build or replacement dwelling. This is the most involved category of demolition work, requiring full utility disconnection, an asbestos survey, and formal notice to the council before work starts.
Partial and selective demolition
Removing a single wall, chimney breast or section of a building while the rest stays standing and in use. This is common ahead of an extension or loft conversion, where an opening needs to be formed in a load-bearing wall, or where a chimney breast is being removed to free up floor space. Because the surrounding structure has to remain stable throughout, this work is priced by the specific structure involved rather than by floor area.
Garage and outbuilding demolition
Taking down a garage, shed or other outbuilding, whether to clear space for a garden room, an extension, or simply to remove a structure that has reached the end of its life. Attached garages cost more to remove than detached ones, since the shared wall with the house needs careful, controlled demolition rather than simply being knocked through.
Soft-strip and internal clearance
Stripping a property back to bare walls and floors before a refurbishment begins, removing kitchens, bathrooms, flooring, plaster and internal doors while keeping the structural shell intact. This is usually the first stage of a full property refurbishment rather than a standalone project, and is priced separately from structural demolition work.
What demolition costs in London in 2026
Full house demolition in London generally costs £100 to £150 per square metre, running higher than the UK average because of tighter access, higher skip and waste disposal fees, and stricter party wall requirements on terraced streets. For a typical three-bedroom terraced house, that puts full demolition at roughly £10,000 to £20,000 before any new build costs begin.
Partial demolition is priced by the specific job rather than by area: removing a load-bearing wall to open up a room typically costs £1,500 to £3,000 once structural support and Building Control sign-off are included, and removing a chimney breast on one floor sits in a similar range. Garage demolition runs from around £1,000 for a simple detached single garage up to £4,000 for a larger attached double garage where the shared wall with the house needs careful protection.
Semi-detached and terraced properties generally cost more to demolish than an equivalent detached building, because the neighbouring property has a legal right of support, meaning slower, more careful hand demolition along the shared wall and a mandatory party wall agreement before work can start.
Section 80 notices, planning permission and party walls
Most full demolitions in England require a Section 80 notice under the Building Act 1984, submitted to the local council at least six weeks before work begins, confirming how the demolition will be carried out safely and how the site will be left afterwards. Demolishing a listed building, or a building within a conservation area, needs separate consent before any Section 80 notice can be actioned, and some full demolitions also trigger a standard planning application depending on what is proposed afterwards.
Where a property shares a wall or sits close to a neighbouring building, a party wall agreement is required before demolition starts, and this is non-negotiable on terraced and semi-detached streets across London. We handle the Section 80 notice, any planning checks and the party wall process as a standard part of every demolition project, so it never becomes something you have to chase separately.
Asbestos and safety
Any building constructed or refurbished before 2000 legally requires an asbestos survey before demolition work begins. If asbestos is found, it must be removed by a licensed contractor before general demolition can proceed, and skipping this step is both illegal and genuinely dangerous. We arrange the survey as one of the first steps on every project, and build any necessary licensed removal into the programme and price up front rather than treating it as a mid-project surprise.
Our demolition process
Every project starts with a site survey covering structural condition, asbestos risk, access constraints and what needs protecting nearby, whether that is a neighbouring wall, a retained section of the building, or utilities running through the site. From there we handle the Section 80 notice, party wall agreements and any planning checks, disconnect utilities safely, and carry out the physical demolition using the appropriate method for the structure, before clearing and disposing of all waste.
Where demolition is the first stage of a larger project, whether that is a new build, an extension or a full refurbishment, we sequence it directly into that programme so there is no gap between clearing the site and starting to build.
Why choose Alpha London Builders for demolition
Demolition carries real safety and legal risk if it is rushed or under-specified, which is why we manage the notices, asbestos checks and party wall process in-house rather than leaving you to coordinate separate specialists. Every demolition we carry out is fully insured, compliant with CDM 2015 regulations, and left with the site cleared and ready for whatever comes next.
Frequently asked questions
Do I need planning permission to demolish a building
Not always, but you almost always need a Section 80 notice to the council under the Building Act 1984. Listed buildings and properties in conservation areas need separate consent before demolition can proceed, and we check this as part of every survey.
How long does demolition take
The physical demolition of a typical house usually takes 4 to 10 days once work starts. Including the Section 80 notice period, asbestos survey and any party wall process, a full project generally takes 8 to 12 weeks from first enquiry to a cleared site.
What happens if asbestos is found during demolition
Work stops on the affected area until a licensed contractor has safely removed it. This is why we arrange an asbestos survey before demolition begins on any building constructed before 2000, so it is planned for rather than discovered mid-project.
Will demolishing my garage or extension affect my neighbour
If the structure shares a wall with a neighbouring property, a party wall agreement is required before work starts, regardless of how minor the demolition seems. We manage this process, including appointing a surveyor where needed.
Book a free site survey and we will give you an honest assessment of what is involved, a fixed quote, and a realistic programme before anything comes down.
