Commercial demolition rarely goes wrong because of the machinery. On a Sydney site the excavator, the attachments and the crew are the predictable part. What decides whether a job runs to programme is everything settled before the first panel comes down: consent conditions, service isolations, neighbour protection, hazardous material clearance, and a demolition sequence an engineer has actually signed off. Owners and developers who treat that front end as administrative overhead are usually the ones explaining a stop-work notice to their financier.
Approvals come first, and in New South Wales a commercial teardown is normally authorised either through the development application for the replacement building or, where the planning controls allow it, under a complying development certificate. Either pathway tends to arrive loaded with conditions — permitted hours of work, noise and vibration limits, dust suppression, dilapidation reporting on adjoining buildings, tree protection, a waste management plan, and a traffic management plan. Those conditions are the real scope document. A contractor who prices the job without reading them has priced a different job, and the variation lands on you later.
Work health and safety law then adds its own layer. Demolition is high risk construction work, so a safe work method statement must be prepared before anything starts, and demolition of a structure at or above six metres in height has to be notified to SafeWork NSW at least five days beforehand. Removing load-bearing elements, working near energised powerlines and working over a public place each bring further controls. Underpinning all of it is AS 2601, the Australian Standard for the demolition of structures, which sets out how a building is assessed, planned and brought down in a controlled order.
Site context is what makes Sydney harder than most Australian cities. Very little commercial demolition here happens on an isolated block. There is usually a trading business on at least one boundary, a footpath along the frontage, and a street too narrow for two trucks to pass. That means hoarding and overhead protection, a road occupancy licence and accredited traffic control where vehicles cross the footpath, and often out-of-hours approval so the noisiest work happens when the neighbours are closed. Pre-start dilapidation reports on adjoining properties are cheap insurance; without them, every existing crack in the building next door becomes your problem.
Service disconnection is considerably more involved than on a house. A commercial building may carry multiple tenancy meters, a shared fire service with boosters and hydrants, trade waste connections, backup generators, and in some cases an embedded substation that cannot simply be removed on request. Every authority runs its own application process on its own timetable, and none of them moves faster because your settlement date is close. Six to eight weeks of lead time on the electrical side alone is common, so these applications belong at the start of the project, not on the contractor’s first site visit.
Hazardous materials need a survey before demolition, never during it. Commercial stock built before the mid-1990s routinely contains asbestos in vinyl floor tiles and their adhesive, fire doors, pipe lagging, electrical backing boards, cement roof sheeting and eaves. Alongside it you can expect lead paint, synthetic mineral fibre insulation, older light fittings, and refrigerant gas that must be recovered by a licensed technician before air-conditioning plant is stripped. Anything friable, and any non-friable asbestos beyond ten square metres, has to be removed under licence and notified to the regulator before that work begins.
Sequencing is where an experienced contractor earns their fee. Partial demolition, facade retention, shared party walls, common slabs in a strata building and adjoining basements all change the order of operations and usually require temporary propping designed by a structural engineer. The plan should state how the structure will be taken apart, what stays standing and how it is supported, where the machines will sit, and how loads travel out of the building. If a contractor cannot explain that sequence to you in plain language, they have not worked it out yet.
Finally, look at where the material goes. Concrete can be crushed and reused, structural steel and cabling carry real scrap value, and a contractor who separates streams on site rather than sending mixed loads to landfill will usually be cheaper as well as easier to defend against a consent condition. Waste leaving the site has to be classified correctly under the EPA framework, and the disposal dockets form part of your project record.
When you compare tenders, compare scope rather than the headline figure. A properly scoped commercial demolition Sydney project produces a written demolition plan, a safe work method statement, evidence of licensing and public liability cover, a hazardous materials survey, and an unambiguous list of what is included — slab and footings, basements, retaining structures, hardstand, tipping fees, asbestos removal, traffic control and certifier costs. Quotes that look tens of thousands apart almost always differ on exactly those items rather than on the labour rate.
