If you're about to have a building project carried out-be it a residential new build, commercial development or civil works-you might have noticed that the construction terminology "excavation" and "earthworks" are often used to mean the same thing. Even though they are highly similar and frequently performed by the same contractor, they do differ-here's what you need to know.
We explain exactly what excavation services and earthworks are, show you how they differ, and give you the best ways to select the right people for your next job.
What Are Earthworks?
Earthworks is a general term used to describe any construction process that involves excavating, moving and/or preparing ground. It is a general term for excavation work and encompasses any work from exploratory site assessments to final block grading and is often the first stage of a construction project.
Typical earthworks activities include:
- Site clearing and vegetation removal
- Deconstruction and removal of any residual structures, foundations etc where necessary
- Cut and fill to bring to site levels
- Building pad, road, or driveway grading and levelling
- Drainage works and stormwater management
- Introduction of soil compaction. Compacting soil to form a firm foundation for construction.
- Erosion and sediment control during the works
To sum up, earthworks are all about getting the site ready so it will be safe, stable and build-able. It encompasses the whole site, not just each individual hole or trench.
What Are Excavation Services?
Excavation is one form of earthworks activity. This is where there is the removal, movement and removal of soil, rock or other material of a particular site for the purpose of forming a cavity for a certain reason.
Common excavation tasks include:
- DUGING footings and foundations for buildings'
- Trenching for Plumbing, Electrical, or Stormwater Pipes
- Basement and retaining wall excavation
- Pool excavation
- Rock breaking and removal
- Excavate in bulk for large civil projects or commercial sites
The excavation phase can frequently be one of the most technical and safety critical stages of a project, especially when excavating close to underground services, on sloping ground and in weakened ground conditions. It needs the correct plant, a skilled operator and pre-conceived knowledge of the ground conditions.
Excavation Services vs Earthworks: The Key Differences
- Scope of Work
Earthworks shows the whole picture-is all the work that is involved in prepping the site including clearing, grading, drainage and compaction. Excavation is just one part of the overall picture, and deals with excavation and disposal of the material.
- Purpose
Earthworks is primarily the process of cutting and levelling land to an appropriate level and shape for building, landscaping or civil engineering application, whereas excavation is normally in response to a predefined structural or service provision, such as a base, underground pipe or basement.
- Equipment and Techniques
Both earthworks and excavation require the use of heavy machinery including excavators, bulldozers, graders and skid steer buckets. Earthworks construction may utilize the use of compactors, water carts, grading equipment and other large site preparation machinery. Excavation construction may use more delicate equipment, such as smaller excavators, trenchers, or rock breakers.
- Project Stage
Earthworks are generally the first thing undertaken at the start of a project, as part of initial site preparation. Excavation can take place either during this initial stage (ie. Bulk excavation of a building pad) or after the site has been progressed (trenching for services/footings etc.)
- Level of Precision
Earthworks generally take more workable tolerances because it's for the general shape and levels of a site. Cutting is probably tightest in the foundations and footings, and service trenches, where the depth, width and position has to be as accurate as possible.
Why Does Distinction Matters for Your Project?
Knowing the distinction between excavation and earthworks isn't simply a matter of semantics - it can also have practical consequences for the way you plan, quote and run your project.
Getting quotes right: Contractors can quote for earthworks and excavation very differently depending on outline scope, size of plant, whether it is a part of a mixed package etc. Know your requirements!
Improved sequencing of the project: Implementing earthworks earlier than detailed earthwork delays and since earthworks must precede detailed earthwork, knowing the sequencing is helpful in scheduling trades and inspections.
Clear communication.: By communicating in the same language as your contractor or engineer you more easily avoid miscommunication, delays and rework.
Follow safety standards: In Australia, any excavation activities (trenching, deep digging, etc.) are likely to require completion of safety compliance procedures. Understanding whether you are carrying out an excavation or a general earthwork is essential.
Do You Need Both Earthworks and Excavation?
For the most part, yes. The conventional path of a build usually begins with groundworks, which include site clearance, cutting and filling to height and levels, and drainage grouting. Once this has been completed, the build may then require excavation for footings, foundations, and drainage trenches. Depending on the size of a development, these stages can occur simultaneously.
The bottom line is that it is worthwhile dealing with a contractor experienced in both. Having one team take the entire earthworks and excavation scope is valuable because there are less points of handover, there is greater experience and efficiency, and therefore a shorter project schedule.
Choosing the Right Contractor
For a qualified earthworks/ excavations provider you should look for:
- Depots and delivery vehicles that support your excavators, trucks and earthmoving equipment fleet-up suitably maintained specifications for differing site conditions.
- Extensive experience in residential, commercial and civil development sites
- Thorough knowledge of the local council requirements and Australian standards for safety.
- The competency to control transport and disposal of material, whether spoil removal or haulage
- Initially clear communication and open quoting.
- Selecting an experienced operator will prevent delays, cost blow outs and compliance problems in the future.
Final Thoughts
Earthworks and excavation are not the same thing, but they are sometimes confused. Earthworks refers to all the work involved in preparing the ground for building while excavation is just the digging that you need to do to get a hole into the ground ready for foundations, services and structure. Understanding the distinction between them will make you a more confident project manager.
Looking to start a new project that requires professional earthworks or excavations? Working with a local team who have years of experience can ensure your project runs smoothly.
Thinking of getting stuck into your next project? Check out formulatransport.com.au to discover more about our earthworks, excavation and transport services.
FAQs
What is the main difference between excavation and earthworks?
Earthworks as a term covers the work of preparing the site with clearing, grading and drainage. Excavation is a subdivision of earth works which involve digging and removing materials for footings, trenches and foundations.
Do I need earthworks before excavation can begin?
Usually, yes. Earthworks can go in and get the site ready by removing plants, smoothing and grading elevations and adding drainage. When the site is stable and level, the excavation work for footings, services or basements can safely happen.
How much does excavation and earthworks cost in Australia?
Prices are highly variable depending on size of site, type of soil, access and extent of work. More expensive sites include those that are rocky or inclined, and where there will be bulk excavation or material haulage. It is important to always get a detailed quote specific to your site.
Can one contractor handle both earthworks and excavation?
Yes, there are a lot of experienced contractors of that kind and operate both phases under a single team. This protects from downtime during handover, optimizes timing and makes necessary communication easier between site preparation, excavation work and conveyance of materials during the overall project.
How long does earthworks and excavation take to complete?
Timeframes vary by site size, naturally. The weather plays a huge part too. As a rule of thumb small residential works will be looking at a couple of days for completion. Bigger civil works and commercial operations with bulk excavation require a large time scale.
Is a permit required for excavation work?
Most councils will want you to get a permit for digging, particularly if it's close to boundaries, services or trees. The rules will depend on your local council and the size of your project, so ask at your local council.
What safety risks are involved in excavation?
There are dangers involved in excavation such as trenches collapse, underground service strikes and unstable ground. The professional contractor will follow safety guidelines diligently, use the right shoring method, and always do a service locate before starting to excavate.
How do I choose the right earthworks and excavation contractor?
Seek experience, appropriate equipment, local council awareness and a straightforward quote. Having the contractor also take responsibility for transport and disposal of the materials will make the management of the project easier and time delays less likely to happen.
