Selective and Interior Demolition Explained

Interior demolition

Interior demolition removes non-structural elements inside a building: ceilings, partitions, flooring, casework, fixtures and finishes. It is the first step in most tenant improvements and remodels.

Soft strip

Soft strip is the removal of finishes and non-structural materials before heavier work begins, either before a full demolition or as the whole scope of a renovation. Separating those materials early is what makes recycling and salvage possible.

Selective demolition

Selective demolition removes specific parts of a structure while protecting the rest: a section of slab for new plumbing, an opening in a concrete wall, a mezzanine, a stair, or an addition. It often combines saw cutting, core drilling and controlled breaking.

A full building demolition can work fast with large equipment because nothing on site needs protecting. Selective work is the opposite: what stays matters as much as what goes. Cuts follow the drawings exactly, vibration and dust are controlled, structural elements may need temporary shoring, and the work has to fit around other trades and sometimes around building occupants.

• Remove ceilings, lights, partitions, doors and flooring down to the shell
• Cap and make safe utilities, coordinated with the electrician and plumber
• Saw cut slab trenches for new plumbing and break out the concrete
• Core drill new penetrations through floors and walls
• Wall saw new door or window openings in concrete or block walls
• Load out debris, separating metals and concrete for recycling

1. Permit: most cities require a demolition or building permit even for interior work, often as part of the tenant improvement permit.
2. Asbestos and hazardous materials survey: required before renovation or demolition in most California air districts, with abatement done first. See demolition permits and asbestos surveys.
3. Structural review: confirm which walls and slabs are structural and whether the slab is post-tensioned.
4. Utilities: identify live systems, shut-offs and anything that must stay energized.
5. Scanning: GPR before cutting or coring where embedded items aren't confirmed.
6. Logistics: debris path, elevator or loading-dock use, working hours and protection of finishes that stay.

Retail centers, offices, hospitals and schools often stay open during demolition next door. That means dust barriers and negative air where needed, wet cutting to control silica, slurry containment, noise-sensitive scheduling or night work, and a clean, secured work area at the end of every shift. Planning those details up front is what keeps neighboring tenants open and complaint-free.

Selective and interior demolition generate mixed debris. Separating metals, concrete and clean wood at the source lowers disposal costs and helps meet CALGreen construction waste diversion requirements that many California jurisdictions enforce on permitted projects.

DSI self-performs interior strip-out, slab trenching, wall sawing, core drilling, breaking and haul-off, so a GC has one sub for the whole demolition and concrete scope. Our labor crews handle strip-out and debris loading. We work across the Inland Empire and Southern California and statewide on larger projects.