The Demolition Process Step by Step: From Survey to Sign-Off

A demolition runs in ten stages, and only three of them involve breaking anything. The stages before the machine arrives take longer than the demolition itself on almost every job, and they are where the programme is won or lost. This is the sequence Cape Demolition Co follows on every project.

The ten stages

Stages 2 and 3 run on other parties' timelines. Everything else is inside the contractor's control. A realistic programme starts those two first. See the demolition timeline.

Why the roof comes off first

A roof structure ties the tops of walls together and holds them in tension. Removing the roof first releases that tie and leaves free-standing walls that can be taken down predictably, course by course or by machine. Demolishing walls with the roof still on transfers unpredictable loads through the structure and produces collapses nobody planned. The order is never reversed.

Why the soft strip happens before the machine

Three reasons, in order of importance. Hazardous material, particularly asbestos, is identified and dealt with while it is still in place and identifiable rather than mixed into rubble. Recoverable material comes out intact and carries value. Waste streams separate at source, which costs less to dispose of than a mixed load. See interior strip-out and waste disposal.

Site set-up: the day that saves the programme

Stage 5 takes under a day on a house and it determines how the rest of the job runs. Five things get established before any demolition starts.

• The exclusion zone. Physically marked, sized on the height of what is coming down, and moved as the work progresses. See safety and method statement.
• Hoarding and screening. A hard boundary to the public side, debris netting where material can travel.
• The haul route. Where machines and trucks move, protected against damage to paving, kerbs and services.
• Skip or tipper position. Chosen so loading does not cross the exclusion zone.
• Welfare and storage. Where the crew works from, and where salvaged material is stacked out of the way of the machine.

A site laid out so that loading crosses the drop zone loses hours a day to stopping the machine every time a truck moves.

Working around Cape Town weather

Two seasonal constraints shape a Cape Town demolition programme, and they pull in opposite directions.

Neither season prevents demolition. Both shorten some working days, and a programme with no float in it will slip on the first windy week.

What handover includes

Completion is a document set as well as a cleared site. The owner keeps all of it, because the waste management plan was submitted in their name and the permit file is theirs.

• Disposal records evidencing where each waste stream went, with weighbridge tickets
• The dated condition photographs of neighbouring property, before and after
• Confirmation that excavations are backfilled and compacted in layers
• Salvage account, where material was recovered and credited
• Service disconnection certificates for the permit file
• Completion confirmation for the City

Where programmes actually go wrong

Across the stages above, four failures account for most delayed demolitions, and none of them happens on site.

1. The permit was started late. The most common cause by a distance, because owners treat it as paperwork rather than as the critical path.
2. The build date was assumed rather than checked. A structure that turns out to be over 60 years old adds a whole second approval process partway through. See the 60-year rule.
3. Disconnections were requested too late. They run on the supply authority's schedule, and no amount of pressure from site changes that.
4. Asbestos was discovered rather than surveyed for. A discovery stops a mobilised crew and machine; a survey costs a fraction of that. See asbestos on demolition sites.

What the owner does at each stage

Most of a demolition runs without the owner on site. Four moments genuinely need them, and missing any of the four delays the job.

1. At the site visit. Confirming scope, strip depth, and what is being kept.
2. At application. Signing as applicant, and providing the company resolution where the property is company-owned.
3. Before the soft strip. Removing documents, valuables and anything sentimental, and marking what is to be salvaged.
4. At handover. Taking the disposal records, condition photographs and completion confirmation for the permit file.

Everything between those points is contractor and authority work. See before you demolish.

Why the sequence cannot be reordered

Each stage depends on the one before it in a way that is not negotiable. The permit cannot be lodged until the age is established, because the age determines which authorities are involved. Disconnections cannot be evidenced until they have been done, and the permit file needs that evidence. The soft strip cannot happen until services are dead. Structural demolition cannot begin until the soft strip has cleared hazardous and recoverable material. Slab and footings cannot be reached until the structure above is down. Attempting to run stages in parallel to save time is the most common way a demolition ends up costing more, because a stage started early usually has to be redone.