Demolition and site clearing

STA 0+120What demolition and site clearing covers

On a Canadian civil project, "demolition" and "site clearing" cover a range of distinct scopes that are often priced and permitted separately:

• Structure demolition. Full teardown of a building, tank, silo, bridge or other structure, down to grade.
• Selective demolition and soft-strip. Removing interior finishes, mechanical and electrical systems, or one part of a structure while the rest stays standing or is reused.
• Pavement and hardscape removal. Concrete and asphalt surfaces, curb and gutter, sidewalks, taken out ahead of reconstruction.
• Roadside hardware removal. Guardrail, fencing, signs and small drainage structures removed as part of a highway or utility project.
• Site clearing. Clearing and grubbing of vegetation is closer to earthworks than demolition; see earthworks and excavation for how that is scoped and priced.

Each of these is priced differently: structure demolition is usually a lump sum built up from the building's size, construction type and hazardous materials findings, while pavement and hardware removal on public contracts are unit-priced items measured by area, length or volume. The demolition cost guide covers the lump-sum side in more detail; this page focuses on scope, sequence and the unit-priced removal items.

STA 0+240Hazardous materials surveys before demolition

Before a structure of any age comes down, the standard first step is a hazardous materials survey (sometimes called a designated substances survey or a pre-demolition survey). A competent surveyor inspects and, where needed, samples the building for materials that are common in Canadian construction and that become dangerous when disturbed, including:

• Asbestos-containing materials. Pipe and boiler insulation, sprayed fireproofing, vermiculite insulation, floor tile and mastic, drywall joint compound, and some roofing and siding products, in buildings built or renovated before the 1990s in particular.
• Lead. Older paint, some solder and plumbing components, and certain coatings.
• Other designated substances. Depending on the building's history, this can include mercury (thermostats, switches), PCBs (older ballasts and transformers), mould, and ozone-depleting refrigerants.

What the survey finds drives the abatement plan: materials in poor condition or that will be disturbed by demolition are typically removed by a qualified abatement contractor before the structure is torn down, under the applicable provincial occupational health and safety rules for asbestos and other designated substances. Those rules, and the municipal demolition permit requirements that sit alongside them, differ by province and by municipality.

STA 0+360How a demolition job runs

1. Hazardous materials survey. Before pricing or permitting, the building is surveyed for asbestos, lead and other designated substances.
2. Abatement. Materials flagged by the survey are removed by a qualified abatement contractor, with air monitoring and disposal handled under provincial rules.
3. Permits and disconnects. The municipality issues a demolition permit once utilities are confirmed disconnected or capped; buried services still need locates before ground is disturbed. See call before you dig.
4. Salvage and soft-strip. Fixtures, equipment and reusable material are removed before the structural teardown starts.
5. Structural demolition. Mechanical demolition with excavator-mounted shears, hammers or grapples handles most low-rise work; taller or heavier structures use high-reach excavators working from the ground up, floor by floor.
6. Sorting and hauling. Concrete, asphalt, metal and wood are separated on site where practical, then hauled to a recycler, transfer station or landfill.
7. Site restoration. The cleared site is graded and, if the next phase is not starting immediately, stabilized against erosion; see earthworks and excavation for grading and compaction.

Film 19 · High-reach demolition · illustrative film

On a highway or utility project the same logic applies at a smaller scale: locates and utility disconnects come first, then the removal item, whether that is a culvert, a length of guardrail or a section of curb and gutter.

STA 0+480What Alberta pays to remove pavement, culverts and roadside hardware

Alberta Transportation and Economic Corridors tenders removal work as its own set of pay items, separate from the new construction that follows. For contracts tendered between May 2025 and June 2026, the provincial averages were:

Concrete surface removal averaged $37.26 per m²¹, and concrete curb and gutter removal averaged $32.60 per m¹. Culvert removal is priced by length and rises with pipe size: corrugated steel culverts up to 700 mm diameter averaged $119.48 per m¹, over 700 mm diameter averaged $149.60 per m¹, and the general culvert removal item (other materials or unspecified pipe) averaged $156.63 per m¹. Guardrail removal averaged $25.19 per m¹, and fence removal is paid by the kilometre of fence line at $4,582 per km¹, which only makes sense at rural highway scale.

These are highway-scale averages, weighted toward large contracts with dozens or hundreds of metres of a single item. A small urban job, such as removing one driveway apron or a short run of curb, pays more per unit because mobilization, traffic control, disposal tipping fees and contract minimums are spread over far less work. Use these figures as a benchmark for the unit rate on a larger removal package, and as a sanity check on a quote, not as a price for a single-lot job. The demolition cost guide and the unit price index cover the rest of the removal items.

STA 0+600Recycling concrete and asphalt

Concrete and asphalt pavement are among the most recyclable materials on a demolition site. Broken concrete is crushed and screened into recycled concrete aggregate, used as granular base, backfill or pipe bedding in place of virgin gravel; reclaimed asphalt pavement (millings) is either recycled back into new hot-mix at a plant or used as a granular surfacing material on lower-volume roads. Structural steel, rebar and other metals are separated for scrap value, and clean wood is chipped or reused where a local market exists.

What actually gets recycled on a given job depends on the volume, what the local market will take, and whether a crusher can mobilize to the site economically or the material has to be hauled to a fixed recycling yard. See aggregates and gravel for how crushed and recycled material is specified and priced alongside virgin pit run and crushed gravel.

STA 0+720Permits, locates and tendering demolition work

A municipal demolition permit is the norm for any structure demolition in Canada; requirements (application, notice to neighbours, utility disconnect confirmation, tree protection, dust and noise control) are set by the municipality and vary by city, so check with the local building department before applying a general rule from one city to another. Buried services on the property, and any private lines the owner has run to outbuildings, still need to be located before ground is disturbed, even on a site being cleared rather than dug; see call before you dig for notice periods by province.

Federal and provincial public-sector demolition work is tendered like any other civil contract. On CanadaBuys, demolition services are filed under UNSPSC code 72141510², with the older GSIN code 5112² for demolition work and 5113² for site formation and clearance still used in parallel by some departments. The CanadaBuys open-data files only carry federal notices, even though the portal lists tenders from other levels of government³, so most municipal demolition tenders are advertised on the municipality's own portal or on a shared platform; see bidding on public tenders and the live tender feed.

STA 0+840What to send for a price

A demolition brief that gets a firm number usually includes:

• The structure's size, age, construction type (wood frame, masonry, concrete, steel) and number of storeys, or the area and thickness of pavement to be removed.
• Whether a hazardous materials survey has been done, and what it found.
• Utility status: confirmed disconnected, or still live and needing disconnection.
• Access, adjacent structures, and any shoring or protection they need.
• What happens to the material: hauled off site, crushed and reused, or a mix.
• The schedule, including whether the site needs to be ready for a specific next phase.

Ask whether the price includes the hazardous materials survey and abatement or assumes they are handled separately, and who carries the disposal and tipping fee risk if the volume of debris turns out higher than expected. Those two questions account for most disputes on demolition jobs.