1. Define the retained and removed construction
Confirm the extension boundary, retained elevations, roof junctions, services, structural information and handover.
Core service
Extension & Partial Demolition across Surrey & London
Selective removal of extensions and parts of existing buildings while protecting retained areas.
We plan the work around your site, access, waste removal and the finish needed for the next stage.
- Veteran-led
- Clear quotations
- Project-specific RAMS where required
- Waste routes planned
- Ready for the next stage
What this service includes
This service is suitable for homeowners, builders and property developers. The scope is built around the project information, retained elements and the condition needed for the next stage.
Typical scope options
- Rear and side extension demolition
- Partial house demolition
- Roof and selected structural removal
What can be included
- Sequenced removal plan
- Protection of agreed retained areas
- Waste management within the scope
Removing part of a building while protecting what remains
Extension demolition removes an agreed rear, side, single-storey or suitable multi-storey element while protecting the retained building. The work is defined around the separation line, shared walls, retained elevations, roof junctions, services passing through the removed area and the handover needed for a replacement extension or following contractor.
It differs from Structural Alterations, which delivers permanent engineer-defined construction work, and from Full House Demolition, which removes an agreed whole structure. Extension demolition is controlled separation and removal of part of a building, with making safe and permanent making good treated as distinct scope items.
Information needed before partial demolition
- Drawings or a clear scope identifying the extension, retained building and intended replacement work.
- Structural information, temporary-support requirements and roof-junction details where relevant.
- Utility information for services passing through or serving the removed area.
- Access details for rear gardens, side passages, plant, loading and debris removal.
- Suitable asbestos survey information before relevant intrusive demolition work and project-specific statutory responsibilities.
Retained elevations, roof junctions and access
The demolition method must be prepared by a competent person around the actual extension, stability, retained construction and site risks. Controlled separation from the retained building may require hand demolition, appropriate plant assistance, temporary support and weather protection at roof junctions.
Restricted rear-garden access can affect plant selection, loading and the removal sequence. Utilities must be traced, isolated or disconnected through the appropriate provider or competent trade. Shared walls, neighbours, dust, noise, vibration and public protection are considered around the actual property.
Slabs, foundations and replacement-extension handover
Debris is separated and removed through the agreed route, with dust, noise and vibration controls selected for the task and surroundings. Slabs and foundations are included only where stated, as are any retained edges, drainage, landscaping or boundary features.
Section 80 may apply to demolition of all or part of a building, subject to exemptions. HSE guidance says notice is normally given to the local authority at least six weeks before intended demolition. It is not planning permission, and responsibility for notices must be confirmed for the project. A suitable refurbishment or demolition asbestos survey is required before relevant intrusive work.
See this work in practice
Pulborough is the principal verified extension-demolition example. Esher is included only for its verified partial house demolition scope; Croydon is deliberately excluded as it does not evidence removal of an existing extension.
Pulborough, West Sussex
Pulborough Extension Demolition & Site Preparation
A rear extension was demolished and the site prepared for a new extension on behalf of a builder.
View Project
Esher, Surrey
Esher Partial House Demolition & Strip-Out
Controlled partial demolition of a semi-detached house for property redevelopment.
View ProjectAn extension-demolition sequence
2. Prepare access and protection
Plan rear-garden routes, loading, protection, weather measures and controls around neighbours and retained fabric.
3. Confirm support and utilities
Coordinate temporary support requirements and establish suitable utility isolation through the appropriate providers.
4. Separate and remove the extension
Use the competent controlled sequence, with hand demolition or suitable plant assistance around the retained building.
5. Clear to the agreed replacement stage
Remove debris and leave the stated slab, foundation, separation line or safe handover for following work.
A protected retained building and defined replacement stage
The handover may be a separated retained elevation, a cleared extension footprint, retained or removed slab and foundations, or another stated condition for the replacement extension contractor. Permanent making good, new roof work, structural design and rebuilding are not automatically included.
Pulborough is the principal evidence because its verified record supports extension demolition and concrete breakout. Esher is included only for verified partial house demolition. Croydon is not used as extension-demolition evidence because its record concerns preparation for an extension, not removal of an existing extension.
Questions clients ask
What is extension demolition?
It is the controlled removal of an agreed rear, side, single-storey or suitable multi-storey extension while protecting the retained building.
How is it different from structural alterations?
Extension demolition removes part of a building. Structural alterations are permanent construction work completed to an engineer-defined design.
How is it different from house demolition?
Extension demolition protects a retained building while removing one part. House demolition concerns an agreed whole residential structure.
Can you work in a restricted rear garden?
Yes, subject to a review of access, loading, plant suitability, hand-demolition requirements and debris routes.
Are slabs and foundations included?
Only when they are identified in the agreed scope and handover condition.
What happens at roof junctions?
Roof junctions, weather protection and retained elevations are planned around the actual separation and following construction requirements.
Related services
House Demolition
Planned demolition of houses and substantial structures for redevelopment or major renovation.
ExploreStructural Alterations
Controlled openings and load-bearing wall removal from suitable structural engineer information.
ExploreSite Clearance
Clearance of demolition debris, redundant structures and agreed materials for the next stage of work.
ExploreCan a partial demolition be combined with strip-out work?
Yes, where the site and programme allow, the written scope can coordinate selective demolition with internal strip-out and site preparation.
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