A contractor renews a water main down the main street of a regional town. Two hundred metres in, the excavator exposes a brick barrel drain, hand-laid, clearly old, running at an angle to everything on the drawings. Nobody knew it was there and it is not a service any authority claims.

That is a relic, the ground around it is an archaeological site, and in several Australian jurisdictions continuing to excavate is an offence regardless of whether anyone intended harm. The job stops for an archaeologist, the heritage regulator becomes a party to the project, and the water authority discovers it has a problem it never scoped.

This guide covers that regime. Aboriginal cultural heritage is a different body of law with different duties and a different process, and it is covered in full in our guide to Aboriginal cultural heritage in civil works. Both can apply to the same trench.

Two heritage regimes, not one

	Aboriginal cultural heritage	Historic heritage
What it protects	Aboriginal objects, places and intangible cultural values	Places, structures, relics and archaeological deposits from post-contact settlement
Who decides	Aboriginal parties and the relevant state body, under the duty of care	A heritage council, regulator or local authority, depending on the listing
Trigger	Harm to an object or place, whether or not it is recorded	Disturbing a listed item, or a relic, or land within a declared area
Instrument	Cultural heritage management plan, permit or agreement	Heritage approval, consent, exception or exemption
Who does the field work	Aboriginal parties, with an archaeologist where required	A qualified historical archaeologist or heritage consultant

The practical point for a contractor is that satisfying one says nothing about the other. A project with a completed Aboriginal cultural heritage process can still halt on a historic relic, and the two approvals are obtained from different bodies on different timeframes.

What is actually protected

Contractors tend to picture a heritage-listed building. The category is far wider, and most of what catches civil work is not a building at all.

• Structures — bridges, culverts, retaining walls, wharves, water towers, pump houses and weirs, many of them still in service and still being maintained by their owner.
• Infrastructure fabric — bluestone kerb and channel, sandstone gutters, timber block or brick paving under a bitumen seal, early drainage and sewer works.
• Relics below ground — footings, cesspits, wells, privies, bottle dumps, foundations of demolished buildings, and the deposits around them.
• Landscape elements — avenues of honour, mature plantings, fences, memorials and street furniture.
• Precincts and conservation areas, where the protection attaches to the area rather than to any individual item.
• Movable items and fabric that can be removed, which raises questions about salvage and reuse.

Two features make this different from most approvals work. Protection can attach to things nobody has recorded — in several jurisdictions a relic is protected by its nature rather than by being listed. And the thing protected may be the very asset you are replacing, which is a common and awkward situation on old water, sewer and drainage networks.

The layers of listing, and which one bites

Layer	Typically covers	Effect on your work
Commonwealth	National and Commonwealth heritage places, and places on Commonwealth land	Rare on local civil work; significant on defence, port and airport projects
State or territory register	Items of state significance, and in some jurisdictions all relics	The most common trigger for approval and the most onerous process
Local planning scheme overlay	Locally significant items and conservation areas	Managed through the planning approval, and frequently the one missed
Asset owner’s own register	Rail, water, port and council asset heritage lists	Contractual rather than statutory, but it will stop your work just as effectively
Non-statutory listings	Trust and institute classifications	No legal force, but they shape community and council expectations

The layer most often missed is the fourth. Rail and water authorities in particular maintain internal heritage registers covering structures that appear on no public list, and their requirements are enforced through the access or works approval rather than through heritage law.

Where civil contractors meet it

• Main street renewals in country towns and old suburbs, where the early town fabric sits under the road surface.
• Water, sewer and drainage renewal in the oldest parts of a network, which is where the renewal programme naturally concentrates — see water and sewer pipeline tenders.
• Bridge and culvert works on older structures, including widening, strengthening and replacement — see bridge and structures tenders.
• Rail corridors, where station precincts, platforms, goods sheds and signal structures are routinely listed — see rail civil works tenders.
• Ports and waterfronts, where wharf structures and reclaimed ground carry both heritage and contamination issues — see airports, ports and freight civil works.
• Parks, cemeteries and civic spaces, including memorials and plantings — see parks, sport and recreation civil works.
• Demolition and site clearing on older sites, where the archaeology begins once the slab comes off — see demolition and site clearing.
• Former industrial land, where heritage and contamination frequently occupy the same ground — see landfill and remediation civil works.

Approvals, and who is supposed to obtain them

Historic heritage approvals are normally the principal’s responsibility, because they attach to the project rather than to the construction method. That does not make it safe to ignore.

• Check that it exists, and read it. The conditions, not the fact of approval, determine how you work. Ask for the approval document at tender stage rather than after award.
• Check its scope. An approval for the works as designed may not cover your access route, your compound, your stockpile or the service relocation you proposed.
• Check its currency. Heritage approvals lapse, and a project that sat on a shelf for three years may need a fresh one.
• Some things you will obtain. Where your methodology disturbs something the design did not — a shoring line outside the footprint, a new access — the consequent approval is normally yours.
• Exemptions and exceptions exist for minor or like-for-like work in several jurisdictions, and they usually come with conditions and notification requirements rather than being a free pass.
• Harm without approval is an offence, typically with substantial penalties, and in some jurisdictions it does not require intent.

The general approvals framework this sits inside is covered in our guide to environmental approvals and permits; the heritage-specific point is that the regulator is a different body with different timeframes and generally less flexibility.

Archaeological assessment and what it produces

Where disturbance of archaeological deposits is likely, the project will have gone through an assessment process. Contractors should understand what it produced, because those documents govern the dig.

Document	What it does
Desktop assessment	Historical research predicting what may be present and where
Archaeological potential or sensitivity mapping	Divides the site into zones of likely significance — the map your excavation plan should follow
Heritage impact statement	Assesses the effect of the works and proposes mitigation; usually supports the approval application
Testing or test excavation	Targeted investigation to confirm what is actually there, ideally before your programme is fixed
Research design or excavation methodology	How any salvage excavation will be carried out, and by whom
Unexpected finds protocol	What everyone does when something turns up — the document your crew must actually know

Of those, the one that matters most on site is the last, and it is the one least often read. Ask for the unexpected finds protocol specifically, and if the project does not have one, that absence is itself worth raising in the clarification window — see tender clarifications and the RFI window.

Working under a heritage approval

Heritage conditions change how civil work is done, and the changes are productivity changes rather than paperwork.

• Archaeological monitoring. An archaeologist present during excavation in sensitive zones, with authority to stop the machine. Their availability becomes a constraint on your sequence.
• Controlled excavation. Thin lifts, a toothless bucket, hand excavation around features, and a slower machine — sometimes an order of magnitude slower than normal.
• Exclusion and protection. Fencing and physical protection of retained fabric, with penalties for incursion.
• Vibration limits. Older masonry structures attract stricter limits than modern buildings, which can rule out methods such as driven piling or dynamic compaction — see noise, vibration and dust management.
• Salvage and reuse. Bluestone kerb, sandstone, cast iron and early pavers are frequently required to be removed carefully, recorded, stored and reinstated — a labour-intensive activity routinely priced as demolition.
• Recording before removal. Measured drawings, photography and sometimes scanning before fabric is disturbed, which is a hold point.
• Specified materials and methods for reinstatement, including mortar mixes and laying patterns, which rules out the usual products.

The salvage obligation is the one most consistently underestimated. Lifting, cleaning, palletising, storing and relaying heritage kerb is slow, skilled work, and the quantity that survives the process is lower than anyone assumes — which raises the separate question of who supplies replacements for breakages.

The unexpected find, and the stop-work moment

This is the part every civil crew needs to know, because it happens without warning and the first ten minutes matter.

• Stop work in the immediate area. Not the whole site — the area of the find. Continuing to excavate after a discovery is where the offence usually occurs.
• Do not move it, clean it or collect it. Context is most of the archaeological value, and souveniring is both destructive and, in several jurisdictions, unlawful.
• Protect the area. Barrier it, cover it if weather threatens, and keep plant clear.
• Notify. The superintendent, the project’s heritage adviser if there is one, and the regulator where the protocol or the law requires it.
• Record. Photographs with scale and location, the time, who found it and the depth — the discipline described in our guide to dockets and daily records.
• Human remains are different. Stop, secure the area, and notify police immediately. It is treated as a potential crime scene until determined otherwise, and no one touches anything.
• Wait for direction. Resuming before clearance is the decision that converts a delay into a prosecution.

This belongs in the site induction and on a card in the supervisor’s folder, not in a management plan on a server. The people who will make the decision are an operator and a foreman, at the moment of discovery.

What it does to the programme

Heritage rarely stops a project outright. It reliably slows one, and the delay is poorly correlated with the size of the find.

• Monitoring ties your sequence to someone else’s diary. If the archaeologist can attend Tuesday, you excavate Tuesday.
• A find triggers an assessment, then a decision, then possibly an approval variation. Each step involves a regulator, and regulators work to their own timeframes.
• Salvage excavation is a separate activity that can occupy the work area for weeks, and it is usually done by others while you stand by or work elsewhere.
• The approval may need amending if what is found differs materially from what was assessed, which is the longest path of all.
• Weather protection may be required over an exposed site, which is a cost and an obstruction.

Because of that, the single most useful planning step is to sequence the heritage-sensitive zones early where the contract allows. Discovering a problem in week two leaves options; discovering it in the final fortnight does not.

Who carries the risk in the contract

Heritage sits awkwardly between the latent conditions regime and the approvals regime, and contracts handle it inconsistently.

• Many contracts treat an unexpected heritage find as a latent condition, giving time and cost where the notice requirements are met — see latent conditions in civil contracts.
• Some expressly exclude it, or deem heritage risk to be included where an assessment was provided. That single sentence transfers the whole exposure.
• Where an assessment was provided, the experienced-contractor test is applied against it: you are expected to have read the sensitivity mapping and allowed for what it predicted.
• Delay caused by a regulator may or may not be an excusable delay, and the drafting varies.
• Monitoring costs are sometimes a provisional sum and sometimes included, and the difference is material on a long linear job — see bills of quantities, provisional and PC sums.
• Notice obligations still apply, and the time bar runs from discovery, not from when the delay becomes obvious.

Read those provisions before pricing, and record the position in the tender risk register. A heritage-sensitive job with heritage risk excluded is a different job from the one the drawings describe.

Pricing heritage risk honestly

Element	Note
Reduced excavation productivity	In monitored zones, assume a materially slower rate — and state the assumption
Archaeological attendance	Whether you pay or the principal does, and what standby costs when your work is not ready
Hand excavation	Around retained fabric and features, priced as labour rather than plant
Salvage, storage and reinstatement	Careful removal, cleaning, palletising, secure storage, and relaying by someone who can do it
Breakage and replacement	Who supplies matching material when heritage fabric breaks, and at what cost
Recording	Measured drawings, photography or scanning before disturbance
Protection	Fencing, hoarding, covers and weather protection over exposed areas
Alternative methods	Where vibration limits rule out the obvious method, the cost is the difference between methods
Standby and disruption	The genuine risk allowance, which is about programme rather than direct cost

Where the exposure is real and the contract does not share it, the honest responses are to qualify, to price a visible allowance, or to decline — and that is a go/no-go input, not a detail.

What a tender response should show

• That you have read the heritage documents for this project, naming the listed items and sensitive zones rather than describing heritage generally.
• How your sequence reflects the sensitivity mapping, including doing the sensitive zones early.
• The unexpected finds procedure, in operational terms: who stops, who they call, what happens in the first hour.
• Protection of retained fabric, specifically, with how exclusion is physically enforced.
• Your salvage methodology, which is where most bidders are vague and where councils in particular are not.
• Vibration controls with monitoring, trigger levels and responses, where masonry structures are nearby.
• Who your heritage adviser is, if you are carrying one.
• Induction content, because the control depends on an operator recognising a find.

On main street and civic projects this frequently sits alongside a community criterion, since heritage and local sentiment travel together — see community and stakeholder engagement plans.

Checklist

• Have you checked state, local and Commonwealth listings for the work area?
• Have you asked the asset owner whether the structure is on their internal heritage register?
• Does a heritage approval exist, is it current, and have you read its conditions?
• Does the approval cover your access, compound, stockpiles and any proposed alternative?
• Is there archaeological sensitivity mapping, and does your sequence follow it?
• Is there an unexpected finds protocol, and does the crew know it?
• Does the induction cover what a relic looks like and what to do?
• Does everyone know that human remains means stop and call police?
• Is archaeological monitoring required, who pays, and whose diary controls it?
• Are vibration limits set by nearby masonry, and do they rule out your intended method?
• Is salvage required, and have you priced careful removal, storage and relaying?
• Who supplies replacement material for breakages?
• Is recording required before disturbance, and is it a hold point?
• Does the contract treat a heritage find as a latent condition, or exclude it?
• Are monitoring costs a provisional sum or included?
• Have you scheduled sensitive zones early enough to leave options?

The short version

• Historic heritage is a separate regime from Aboriginal cultural heritage, with different registers, regulators and instruments. Both can apply to the same trench.
• What catches civil work is rarely a building: it is kerb, culverts, early drainage, footings, wells and the deposits around them.
• In several jurisdictions relics are protected whether or not anyone has listed them.
• Rail, water and port authorities keep internal heritage registers that appear on no public list and stop work just as effectively.
• The approval is usually the principal’s, but read it: scope, conditions and currency are what govern your method.
• Ask for the unexpected finds protocol specifically. Its absence is worth raising before you price.
• Heritage conditions are productivity conditions: monitoring, thin lifts, toothless buckets, hand excavation and vibration limits.
• Salvage of bluestone, sandstone and early pavers is slow skilled work and is routinely priced as demolition.
• On an unexpected find: stop in that area, touch nothing, protect, notify, record. For human remains, call police and treat it as a crime scene.
• Resuming before clearance is what turns a delay into a prosecution.
• Delay is poorly correlated with the size of the find, because each step involves a regulator. Sequence sensitive zones early.
• Check whether the contract treats a find as a latent condition or excludes it, and whether monitoring is a provisional sum.
• In a tender, name the actual listed items and sensitive zones, and describe salvage properly — that is where most bidders are vague.

Sources and further reading

This guide is general information for Australian civil construction businesses and is not legal, heritage or archaeological advice. Historic heritage protection, the definition of a relic, registers and listings, approval and exemption pathways, notification duties on discovery, and the offences and penalties for unauthorised harm are established separately by Commonwealth, state and territory legislation and by local planning instruments, and they differ materially between jurisdictions — including whether protection depends on listing. Aboriginal cultural heritage is governed by separate legislation with separate duties. Obligations on the discovery of human remains arise under criminal law and coronial legislation. Always work from the project’s heritage approval and advice from a qualified heritage practitioner. Information is current as at October 2026.

• Commonwealth, state and territory historic heritage legislation and the registers maintained under it, referenced in §02 and §03, together with local planning scheme heritage overlays and conservation areas. These establish what is protected, which approvals are required, what exemptions exist and what offences apply. The regimes are not uniform: in particular, whether archaeological relics are protected independently of listing differs by jurisdiction, as do penalties and whether intent is required.
• Heritage approval conditions, archaeological assessment practice and the documents described in §06 — desktop assessments, sensitivity mapping, heritage impact statements, research designs and unexpected finds protocols. These are prepared for the particular project by qualified heritage practitioners and the project’s own documents govern, not general practice.
• Obligations arising on the discovery of human remains referenced in §08, which arise under criminal law and coronial legislation in each jurisdiction and require immediate notification of police. These sit outside the heritage framework and are not displaced by any heritage approval.
• Related TenderBuilt guides carrying the primary-source detail referenced above: Aboriginal cultural heritage in civil works (the separate regime), environmental approvals and permits, latent conditions, noise, vibration and dust management, and demolition and site clearing.