Constructability Walkthrough Checklist for KDRB Builders in Sydney

One unverified service can stop excavation before the first planned stage is complete. A cable strike may expose workers to electrical hazards. A damaged water main can flood the work area. Contact with a gas service may trigger an evacuation, emergency response and long site shutdown.

A safe before you dig Sydney process starts well before machinery enters the excavation zone. It requires current asset information, a clear site inspection, competent locating, service exposure and a work method understood by every person involved.

Before You Dig Australia (BYDA) gives project teams access to plans and safety information supplied by registered asset owners. These plans are an essential starting point, but they do not confirm the exact position or depth of every underground service.

This guide covers the steps that builders, estimators, project managers, supervisors, and developers can use to manage excavation utility risk across Sydney sites.

Key Takeaways

What to Review at Site-Walk Stage

A site walk turns plans and reports into a practical work sequence. It does not replace structural engineering, geotechnical advice, service locating, approvals or a Safe Work Method Statement.

SafeWork NSW classifies demolition involving load-bearing elements or structural integrity as high-risk construction work. Its excavation guidance directs project teams to assess ground conditions, access, underground services, plant movement, service installation, backfilling and work carried out inside excavations.

Define the Scope and Handover Point

Start by marking what sits inside and outside the contractor’s scope. This is particularly useful when comparing quotes for demolition services across a complete knock-down rebuild package.

Review:

demolition limits, including pools, slabs, walls and outbuildings
site clearing and vegetation removal
bulk cuts, detailed excavation and footings
rock sawing, hammering or grinding
spoil loading, haulage and tipping
shoring, batters and temporary protection
drainage and service-trench interfaces
final levels, tolerances and site clean-up

Avoid broad scope descriptions such as “excavate for the new house”. Refer to structural set-out, reduced levels, footing lines, rock sockets, stockpile areas and the condition required for the next trade.

A clear handover definition can help prevent disputes over trimming, survey corrections, soft spots, excess spoil or work outside the quoted excavation line.

Test the Work Sequence

A proposed method needs to work from site establishment through to handover. Ask:

What must be disconnected, removed or protected before demolition?
Can the selected machinery enter and leave at each stage?
Where will material be sorted, stockpiled and loaded?
Which areas require a survey check or engineering sign-off?
What access must remain open for following trades?
Could demolition block the future excavation route?
Will temporary works restrict truck or machinery movement?

A simple sequence sketch can reveal problems that plans miss. A machine may become trapped once the bulk cut begins. A truck-loading position may disappear after the existing driveway is removed. A retaining wall may need to remain until temporary support is ready.

Builders coordinating several linked work stages can use a staging demolition and excavation guide to review trade interfaces, access changes, hold points and program risks before the site start.

Review Neighbour and Public Interfaces

Record boundary clearances, shared driveways, adjoining walls, footpaths, parked vehicles, traffic requirements, approved work hours and nearby noise, dust or vibration receptors.

Each issue needs a defined action, responsible party and review date. A note such as “protect neighbour’s wall” is too broad. Record:

the wall’s location and condition
the proposed protection method
any engineering or monitoring requirement
the inspection point before work starts
the process for reporting movement or damage

The team should review pedestrian separation, gate controls, truck movements, road cleanliness and safe public access at the same time.

Rock, Access, Asbestos and Services

These four factors cause many quote gaps and program changes. They belong near the top of every demolition site walk checklist and builder prestart excavation checklist.

Rock and Ground Conditions

Bring the geotechnical report, feature survey and records from any nearby excavation. Inspect visible rock, fill, slope, drainage paths and existing retaining walls.

Ask:

What rock type and strength has been reported?
Where is rock expected against proposed cut and footing levels?
Is the quantity measured, estimated or excluded?
Is hammering suitable near adjoining structures?
Would rock sawing or grinding provide better control?
Can excavated rock be reused or processed on site?
Is there enough room for the selected machine and attachment?
How will rock quantities be measured and approved?

Selecting a contractor experienced in excavation in Sydney can help the project team compare machinery, attachments and work methods against local ground conditions, access limits and neighbouring structures.

Rock allowances should state the assumed quantity, method, rate, mobilisation cost and disposal basis. An open-ended rock exclusion gives the builder little cost certainty.

Access and Machinery Movement

Measure gate width, driveway width, overhead clearance, gradient, turning area, ground capacity and the narrowest travel point.

Check the full logistics route, including:

eaves, branches and overhead electrical lines
soft ground, weak paving or suspended slabs
unloading and truck-standing areas
road and kerb protection
wheel-cleaning controls
fuel, water and attachment-change areas
machinery entry and exit sequence
emergency access

A compact excavator may fit through the gate, yet it may lack the reach, breakout force or attachment capacity required for the planned work. Lower production rates may extend the program and increase labour, truck or machinery costs.

Access should be assessed for every work stage. The route available during demolition may change after slabs, walls or driveways are removed.

Asbestos and Hazardous Materials

The national asbestos survey guide estimates that asbestos remains in one in three Australian homes. A home built before 1990 that has not undergone a major renovation is likely to contain asbestos-containing material.

SafeWork NSW states that the asbestos register must be checked before demolition. Where no register exists, a competent person should inspect the structure. Material likely to be disturbed must be removed before demolition, with licensed removal and clearance requirements applied where required.

Confirm:

whether an asbestos survey or register is available
which materials have been sampled
whether inaccessible areas remain
the required removal licence class
the proposed isolation area
the waste handling and transport route
clearance inspection responsibilities
whether asbestos-contaminated soil is suspected

A quote should state whether asbestos removal, clearance certificates and disposal charges are included, excluded or treated as provisional items.

Underground and Overhead Services

Request current asset information, then verify site conditions through the required locating and proving process.

SafeWork NSW states that underground essential-services information for the site and adjacent areas must be obtained before excavation and supplied to the people carrying out the work.

Check:

authority service plans
private electrical, water, gas and drainage lines
disconnection certificates
temporary site supplies
electronic locating results
non-destructive digging or potholing points
overhead clearances
conflicts with footings, piers, tanks or retaining walls

Before You Dig Australia reports more than 20,000 utility strikes each year, with annual economic damage estimated above $4.6 billion. Its referral service processes more than 2.7 million requests for underground asset information each year.

Plans should be treated as a starting point. The exact location and depth of services may need to be proven before mechanical excavation starts.

Alternate Methods and Pricing Options

A walkthrough should lead to a quote that explains how site conditions affect method, production and cost.

Site issue	Base method	Alternate method	Quote detail to clarify
Hard rock near boundaries	Hammer excavation	Rock sawing or grinding	Rate, quantity, mobilisation and disposal
Narrow access	Compact excavator	Crane-in machinery or staged hand work	Lift cost, permits, labour and output
Limited truck access	Direct load-out	Stockpile and shuttle machinery	Double handling and road controls
Suspected asbestos	Survey and removal	Provisional allowance pending results	Removal, clearance and disposal
Deep cut near structures	Engineered batter	Shoring or staged excavation	Design, monitoring and removal
Unknown services	Plans and electronic locating	Non-destructive digging	Prove points and reinstatement
Large soil volume	Direct excavation and haulage	Staged excavation with stockpiling	Truck numbers, tipping and handling

For larger cuts, the walkthrough should examine how bulk excavation will interact with truck access, spoil storage, rock removal, temporary drainage and detailed excavation.

Ask tenderers to state:

assumptions and exclusions
provisional quantities
unit rates
machinery and attachments
likely production rates
disposal classifications
hold points
survey responsibilities
alternate methods
variation approval processes

This gives the estimator a fair basis for comparing tenders. A low initial price may omit access controls, rock treatment, double handling or waste costs that appear later.

For complex sites, request a short method statement checklist Sydney package covering machinery, sequence, controls, spoil handling, service protection and handover. SafeWork NSW permits generic SWMS documents for recurring high-risk work, but each document must suit the actual task and site.

Book a 48-hour constructability walkthrough before the work package is finalised. Early method input can reduce quote gaps and give the team clearer options for rock, access and staging.

Documents to Gather Before Quote

Provide the latest revision of each available document:

architectural, structural and civil drawings
demolition plan and scope schedule
feature and level survey
geotechnical report
stormwater and hydraulic plans
DA, CDC or CC documents and consent conditions
asbestos survey or register
contamination and waste-classification reports
service plans, locating reports and disconnection records
dilapidation reports
construction program and required start date
traffic, pedestrian or environmental plans
site photographs and access measurements

Mark superseded drawings clearly. Quote gaps can arise when the estimator prices one drawing revision and the site team works from another.

Check the Drawing Package

Review whether the drawings show:

existing and proposed levels
cut and fill depths
footing and pier locations
retaining walls
basement extents
temporary support requirements
stormwater lines and pits
service routes
trees or structures to remain
demolition limits

Where information is missing, record it as a pre-quote action rather than relying on an assumption.

Check the Approval Conditions

NSW Planning Portal guidance for knock-down rebuilds lists demolition approval, utility disconnections, hazardous-material controls and the use of a licensed demolition contractor as core planning items.

Review approval conditions covering:

demolition hours
waste disposal
tree protection
sediment and erosion controls
road occupancy
traffic management
asbestos handling
neighbour notifications
service disconnections
inspection requirements

The quote should identify any approval-dependent work that remains outside the contractor’s direct control.

Constructability Review Checklist

Use this field list during the walkthrough:

Scope: structures, slabs, pools, walls, clearing and exclusions
Handover: levels, tolerances, survey checks and clean-up
Approvals: pathway, consent conditions, notices and work hours
Rock: expected depth, method options and quantity basis
Access: widths, clearances, turning, unloading and truck position
Adjoining assets: boundaries, walls, trees and condition records
Asbestos: survey, removal, clearance and disposal
Services: plans, locates, prove points and disconnections
Spoil: classification, stockpile area, load-out and receiving facility
Temporary works: shoring, batters, fencing and protection
Controls: dust, noise, vibration, runoff, mud and public separation
Machinery: machine size, attachments, entry and exit sequence
Program: stages, hold points and next-trade handover
Commercials: assumptions, exclusions, rates and alternatives
Documents: SWMS, licences, insurance and quality records

The NSW EPA states that demolition waste, soil and contaminated soil must be reused or disposed of lawfully. Waste owners and transporters may both face liability where material is taken to an unlawful facility.

Record checklist actions during the walk. Assign each item to a person and set a completion date before the quote or work method is approved.

Final Words

A strong constructability review checklist gives the builder a clear picture of how demolition and excavation will work on the actual block. It brings access, rock, asbestos, services, machinery, waste and handover requirements into one coordinated review.

The best time to identify a method conflict is before machinery arrives. Early site input gives estimators clearer allowances, gives project managers stronger program information and gives site supervisors a more practical work sequence.

Rick Davis Contracting works across complex residential and civil sites involving rock, restricted access and linked demolition-to-excavation scopes. Our approach centres on safe methods, clear documentation, transparent scope and reliable delivery.

Book a 48-hour constructability walkthrough for your KDRB project. Bring the latest plans, reports and known site constraints so our team can review method and quote inputs before the work package is locked.

Frequently Asked Questions

What is a constructability walkthrough?

It is an on-site review of how the proposed demolition and excavation scope can be carried out. The team checks access, machinery, ground conditions, services, hazards, sequence, spoil movement and handover requirements.

When should a KDRB builder book one?

Book the walkthrough before the quote is finalised, once the survey, plans, geotechnical information and key approval conditions are available.

Does it replace a geotechnical report or SWMS?

No. It supports planning and pricing. It does not replace engineering, surveying, service proving, approvals, asbestos assessment or site safety documents.

Who should attend?

The builder’s project manager, estimator or site supervisor should attend. The architect, engineer or hydraulic consultant may need to join where design interfaces remain unresolved.

What should the builder receive after the walkthrough?

Useful outputs may include clarified scope notes, identified risks, proposed machinery, sequence options, quote assumptions, provisional items and a missing-document list. Agree on the required deliverable before the visit.

What happens when rock quantities are unknown?

The quote may use a provisional quantity, schedule of rates or alternate method allowance. The measurement and approval process should be agreed before excavation begins.

Why review demolition and excavation together?

The two stages often share access routes, machinery zones, stockpile areas, temporary controls and program interfaces. Reviewing them together can reveal sequencing conflicts before they affect the site program.