For a Sydney knockdown rebuild, construction begins long before the new slab is poured. The existing house has to be assessed, the demolition approval pathway resolved, hazards and services identified, and the cleared block prepared so the new home can be built safely. Problems at the handover between demolition and construction can delay the project or create unexpected work.
This guide focuses on knockdown rebuild site preparation in Sydney, not whether renovating or rebuilding is the better financial choice. Homeowners making that earlier decision can read our renovate versus rebuild guide for Epping. If the rebuild direction is already selected, the next task is to establish a clear demolition and site-handover scope.
1. Establish what approvals are required for both stages
Demolition and construction do not automatically share one approval. Depending on the property, demolition can be assessed through a development application or an eligible complying development pathway. The proposed new home also needs the appropriate planning and construction approval. Heritage, environmental and other restrictions can change what is permitted.
The NSW Planning Portal’s knockdown rebuild journey explains the stages of planning, approval, demolition, building and handover. Ask the designer or planning adviser to confirm what can happen in what order for your property. Do not book a demolition crew merely because the new-house concept is attractive.
Find out which party is responsible for lodging applications, obtaining certificates, satisfying conditions and coordinating the principal certifier where required. These responsibilities should be written into the preliminary services agreements and later construction documentation.
2. Review existing structures and available documentation
Gather any original house plans, renovations approvals, surveys, title details and information about outbuildings, garages, retaining walls, underground tanks or pools. Even if everything is intended for demolition, those features can affect the scope of work and the condition of the land handed over to the new builder.
Check whether neighbouring properties depend on existing retaining walls or fences. A garden wall that seems minor may be providing support to an adjacent level. Removal could require engineering, temporary works or a different construction sequence. Confirm what is to be removed, what is to stay and who is responsible for making the remainder safe.
Also identify significant trees, possible council controls and the likely site access route. A contractor who cannot physically access the rear of the property may need a different demolition method or machinery than was assumed in the initial quote.
3. Assess asbestos and other hazardous materials before demolition
Older Sydney homes may contain asbestos-containing materials, lead paint, old chemicals or contaminated soil. Hazard identification should be undertaken by appropriately competent professionals before destructive work. If asbestos is present, follow the applicable licensing, notification, handling and clearance requirements rather than treating it as ordinary building waste.
SafeWork NSW demolition guidance specifically identifies asbestos and other hazardous substances as pre-demolition hazards. The NSW Planning Portal demolition checklist also discusses safe removal and relevant documentation.
When requesting prices, confirm who arranges the investigations, whether hazardous removal is included, who handles regulated waste and what happens if unexpected materials are discovered. A small initial allowance may not cover the actual work required. Any specified clearance documentation should be provided before other trades re-enter the site.
4. Plan utility disconnections and protection
Before demolition, the project team needs an agreed plan for electrical, gas, water, sewer, telecommunications and other relevant services. Licensed specialists and infrastructure providers may have distinct disconnection and protection requirements. A service being switched off inside the house is not proof that the external connection is safely isolated.
Request service plans and any needed physical location work. Before You Dig Australia can help obtain asset information, but recorded alignments may need on-site verification. Ask who is responsible for each application, inspection, certificate and temporary site supply, including whether the new builder needs water or electricity available during early works.
It is particularly important to identify whether any shared or neighbouring services pass through the site. Cutting a line without understanding its ownership and destination can cause serious safety and operational problems.
5. Define the demolition boundary precisely
A useful demolition scope identifies the main house and every other element to be removed: garage, sheds, decks, fences, driveways, paths, existing slabs, footings, landscaping, trees, pools and service structures where relevant. It also states what must be protected, including neighbouring buildings, boundaries and infrastructure.
Ask whether the price includes breaking out below-ground footings or just clearing what is visible above ground. Retained underground concrete can obstruct new excavations. Conversely, over-excavation may introduce costs for imported and compacted fill or engineered foundation solutions.
Discuss waste removal, recycling and lawful disposal. The NSW Planning Portal describes construction and demolition wastes such as concrete, brick, timber, soil and regulated materials. A written waste-management scope is more useful than a general “all rubbish removed” statement.
6. Assess the land for the new house before the old one disappears
The replacement design should respond to the actual block. Establish the information needed for site levels, soil or rock conditions, drainage, tree protection and the proposed building footprint. Depending on the project, geotechnical testing may be required to inform the footing design; the demolition sequence should not destroy important site markers or obstruct investigation locations.
Where practical, coordinate the surveyor, geotechnical adviser and structural engineer’s requirements before demolition starts. This can avoid a cleared block waiting for essential information that could have been arranged earlier. It also helps distinguish ground conditions already known from those that remain uncertain until excavation.
Our Sydney new-home site-cost checklist explains why ground conditions, access and service arrangements can be more important to the eventual contract sum than the age of the original house.
7. Consider stormwater, surface grading and neighbour protection
Demolition may remove roof and paving surfaces that previously directed water away from the home. A cleared site can behave differently during heavy rain, particularly where excavation and exposed soil are present. Plan erosion and sediment controls, temporary drainage and the protection of adjoining land.
Ask whether retained stormwater pits and lines will be protected or removed, and who will make them safe. If the future house has a different roof or driveway layout, the designer should coordinate a new stormwater scheme and the lawful point of discharge. On a sloping block, movement of water and soil may require particular attention.
A change in ground levels near boundaries can affect adjoining property. Ensure that excavation and retaining requirements are considered by qualified professionals before machinery arrives, not treated as an afterthought when the old house has gone.
8. Confirm temporary fencing, access and site security
Demolition and new-home construction each require suitable arrangements for site access, security and work health and safety. The demolition contractor should plan how machinery will enter, where waste containers or trucks can stand, and how public footpaths, neighbouring driveways and retained structures will be protected.
Check which licences or SafeWork NSW notifications may be necessary for the proposed demolition work. Requirements depend on the nature and scale of the work and the activities involved. Do not assume a residential address means demolition is exempt from safety obligations.
After the building is removed, the site should be left secure and free from known immediate hazards. Define who maintains fencing and signs during any gap between demolition and the new builder taking possession.
9. Make the demolition-to-builder handover measurable
The handover should include a clear statement of the land condition, works completed, outstanding items and relevant paperwork. Where applicable, obtain demolition completion records, utility disconnection confirmations, asbestos clearance documentation, waste disposal records and updated survey or site-level information.
Ask whether the agreed scope leaves the lot ready for the new builder’s site preparation or merely removes the visible structures. These are not the same thing. The new construction contractor may still need to remove old foundations, relocate services, cut or fill levels and install temporary works before starting the new footings.
Where the same company coordinates both phases, responsibilities should still be documented. Where separate contractors are used, an agreed inspection and written handover can help avoid disputes over damage or incomplete work.
10. Connect the demolition scope to your new home budget and timeline
Demolition and site works can interact with design and finance milestones. A construction lender may have its own documentation and valuation requirements, and the builder may need approvals and engineering information before issuing a final programme. Make sure the owner understands what will be paid during the demolition stage and what has been included in the new building contract.
Our Sydney knockdown rebuild cost guide covers broader financial considerations. This article instead emphasises site readiness and how to avoid handing a construction team a block with unresolved hazards or buried infrastructure.
If you’re still developing the replacement design, our first meeting with a new-home builder checklist helps identify what information to bring before major commitments are made.
Pre-demolition and handover checklist
| Stage | Critical question |
|---|---|
| Planning | Are the demolition and rebuilding approval pathways understood? |
| Survey and investigation | Have relevant levels, structures, ground and hazards been assessed? |
| Services | Who disconnects, locates and protects the necessary utilities? |
| Demolition scope | Do below-ground foundations, slabs, trees and outbuildings appear in the price? |
| Safety and waste | Who manages licensed work, clearance and lawful disposal? |
| Site stability | How are boundaries, temporary drainage and retained structures protected? |
| Handover | What records and site condition must the new builder receive? |
Frequently asked questions
Can the old house be demolished before the new home is approved?
The applicable approval requirements and sequence must be confirmed for the property. Do not assume demolition approval by itself authorises the proposed new dwelling or guarantees that the replacement design will be approved.
Does a demolition quote normally include removal of old footings?
Do not rely on an assumption. Ask the contractor to identify the depth and extent of below-ground removal, any exclusions and how unsuitable or contaminated material will be treated.
What if asbestos is found after demolition starts?
Work should be managed under the applicable safety requirements, using appropriately qualified specialists and any necessary notifications, removal procedures and clearance arrangements. The contract should describe how unexpected hazards will be handled.
Does a cleared block mean the new builder can start immediately?
Not necessarily. Construction still depends on the required approvals, suitable site conditions, confirmed services, coordinated drawings, engineering design and other pre-start requirements.
Prepare your knockdown rebuild with EW Homes
If you are considering replacing a home in Sydney, start by reviewing the existing property’s constraints and what the demolition and building scopes must cover. Explore our new-home construction services and contact EW Homes with the property address, available plans and preliminary new-home requirements. A coordinated assessment can help clarify what work should occur before demolition and the first construction stage.