You’ve navigated the architectural drawings, survived the excavation, and finally seen your vision come to life. The scaffolding is down, the driveway is poured, and you are ready to pop the champagne. But for many Sydney homeowners and builders, there is one final, technical hurdle standing between you and moving in: the Work As Executed (WAE) Survey.
If your Private Certifier or local Council has just added a “WAE plan” to your final checklist, you might be wondering why this is necessary after all the inspections you’ve already passed. In this guide, we’ll break down exactly what a WAE survey is, why NSW regulations demand it, and how it serves as the final “stamp of approval” for your residential project.
What is a WAE Survey?
In the Australian surveying and construction industry, WAE stands for Work As Executed. It is a specialised cadastral and engineering survey performed at the very end of a construction project.
While your initial plans (the ones approved in your Development Application or Complying Development Certificate) showed the intent of the build, the WAE survey shows the reality. Despite the best efforts of builders and contractors, site conditions sometimes require minor adjustments during construction. A WAE survey captures these final “as-built” measurements with millimetre precision.
The output is typically a “Red-Line” plan. This is your original engineering or architectural drawing with the surveyor’s new, real-world measurements overlaid in red. This allows authorities to see at a glance if the finished product matches the approved safety and infrastructure standards
Why is a WAE Survey Mandatory in Sydney?
In New South Wales, the Environmental Planning and Assessment Act and various local Council Local Environmental Plans (LEPs) mandate strict compliance for new builds. A WAE survey is the primary evidence used to prove that your project won’t negatively impact the surrounding environment or public infrastructure.
The WAE survey is the key that unlocks your Occupation Certificate (OC). Without a signed WAE plan from a registered surveyor, your certifier cannot legally declare the building fit for occupation.
The Core Focus Areas of a Residential WAE
1. Stormwater & On-site Stormwater Detention (OSD)
This is arguably the most critical component of a WAE survey in Greater Sydney. Our city’s councils (from the Hills Shire to the Northern Beaches) are particularly vigilant about water management.
When you build a new home or duplex, you increase the “impermeable” surface area of the land. To prevent overwhelming the public drainage system, most modern builds require an OSD (On-site Stormwater Detention) tank.
- The Surveyor’s Role: We measure the “invert levels” (the exact depth of the pipe entries and exits) and the internal dimensions of the tank.
- The Goal: To prove that the tank has the exact volume capacity required by the hydraulic engineer’s design. If a pipe is just 10cm too high, the whole system might fail during a Sydney downpour, potentially flooding your property or your neighbour’s.
2. Driveway Gradients and Kerb Alignments
The “layback” (where your driveway meets the council road) and the slope of the driveway itself are strictly regulated. If a driveway is constructed too steeply, it can cause vehicles to “bottom out” or create safety hazards for pedestrians.
- The Surveyor’s Role: We take levels along the centre-line and edges of the driveway to calculate the exact percentage of the grade.
- The Goal: To ensure the driveway complies with the Australian Standards (AS2890.1) and matches the longitudinal section provided in your initial engineering plans.
3. Finished Floor Levels (FFL) and Building Height
In many Sydney suburbs, particularly those in flood-prone or heritage-sensitive areas, your Finished Floor Level is dictated by law to the millimetre.
- The Surveyor’s Role: We verify the height of the floor levels relative to the Australian Height Datum (AHD).
- The Goal: To confirm the house is high enough to avoid flood risks but low enough to stay within the maximum building height limits set by the Council.
What Happens if the WAE Plan Doesn’t Match the Design?
This is a common concern for homeowners. What if the builder placed the stormwater pit half a metre to the left?
Most certifiers and engineers allow for small “tolerances.” However, if the WAE survey reveals a significant deviation—for example, a structural wall built over an easement or a drainage pipe flowing the wrong way—you may be required to:
- Remediate the work: Physically fix the error.
- Submit an S4.55 Modification: Apply to the Council to legally amend your original approval to reflect what was actually built.
The WAE survey identifies these issues early so they can be resolved before you try to sell the property or face a Council audit years down the track.
The East West Surveyors Process: Getting You to the Finish Line
At East West Surveyors, we understand that by the time you need a WAE survey, you are likely exhausted by the construction process and eager to move in. Our goal is to make this final step as seamless as possible.
Step 1: Digital Document Review
Step 2: High-Precision Field Work
Our licensed surveyors visit your site with advanced Total Station and GNSS technology. We “pick up” every pit, pipe, kerb, and floor level required by your certifier.
Step 3: Calculation & Certification
Top Tips for Sydney Homeowners to Avoid WAE Delays
- Organise Early: Don’t wait until the day before your furniture removalist arrives. Book your WAE survey as soon as the concrete for the driveway and stormwater pits has cured.
- Keep Pits Accessible: Ensure your stormwater pits aren’t covered by landscaping mulch, timber offcuts, or construction waste. If we can’t see the “invert” of the pipe, we can’t measure it.
- Communicate with your Engineer: If your builder makes a change on-site, ask them to check with the civil engineer first. A small change during the build can save weeks of paperwork during the WAE stage
Final Thoughts
The WAE survey is more than just a regulatory box to tick—it is your insurance policy. It confirms that your most significant investment is safe, compliant, and built to last.
If you are approaching the end of your build in Epping, Parramatta, Ryde, or anywhere in Greater Sydney, reach out to the team at East West Surveyors. We specialise in residential WAE surveys and work closely with certifiers to help you get your Occupation Certificate without the stress.
Need a Work As Executed Survey quote? Contact East West Surveyors today or call us on 02 8386 2318
