Hawkesbury City Council
Private building certifier in Windsor
Thompson Square, State-listed and dating back to the 1790s, sits in Windsor among both detached and attached homes. Before any work is drawn, a private certifier in Windsor checks heritage links and shared walls.
NSW 2756
Class 1 homes and Class 10 structures
Local rules
Windsor's heritage core and housing mix
Thompson Square and civic landmarks
Thompson Square took shape in the 1790s and was given its name in 1811. The square and the land right around it are a conservation area on the State list, and council publishes a conservation management plan for it. Windsor also has the courthouse and St Matthew's Anglican Church, both linked to architect Francis Greenway. None of this makes every house in town heritage listed.
Who lives here
Census 2021 figures show 1,915 residents across 847 private dwellings. Freestanding houses were 77.1% of the occupied total. Semis, terraces and townhouses came to 13.9%, with flats at 8.6%. Renovations often involve party walls and shared services.
The planning rules
Hawkesbury Local Environmental Plan 2012 sets zoning and lists heritage items. Council's Development Control Plan (DCP) guides design on heritage land. Expect to prepare a heritage impact statement if the property is itself heritage listed or sits within the square's conservation area. Look up the lot's flood information early as well.
Typical work
Common projects and how they get approved
What owners build here
Common Class 1 and 10 projects in Windsor:
- Rear additions. On heritage land, new openings and external equipment should respect the building's significance.
- Terrace and townhouse renovations. Before altering a layout, confirm the structure, fire separation and any shared services.
- Interior work on listed homes. Internal fabric can be significant too.
- Garages, carports and pools. Check heritage settings, flood levels and drainage.
- Decks and pergolas. Check height and setbacks. On heritage land, even small structures can need approval.
Cafes, shops and apartment buildings sit beyond Class 1 and 10, and a certifier with a different registration takes those on.
How approval usually works
Exempt status is available for some small works that satisfy each standard. For detached houses clear of heritage and flood limits, a CDC (the quick certifier approval under state codes) may work. Work affecting the square's conservation area or another listed item usually needs a development application (DA) to Hawkesbury City Council, then a construction certificate (CC). Flood-affected land may also block a CDC and set floor heights for new rooms. For attached homes, strata approval runs separately. With a terrace or townhouse, verify the structure, the fire separation and any shared services before assuming you can move a wall or reroute a pipe. Commercial fit-outs belong to other classes, handled by a certifier licensed for that work. Start with the heritage map extract, title and any strata plan. CertifiBuild will help you understand which controls touch your home and plan the work around them.
Our services
From approval to sign-off.
One certifier for your whole Windsor job, from the first plan check to the occupation certificate.
Local questions
Questions we hear about this suburb.
No two lots in Windsor are the same. Give us your address and we will check every map that affects it.
See the council pageDoes the Thompson Square heritage area cover all of Windsor?
No. Thompson Square, laid out in the 1790s and named in 1811, is a conservation area on the State list, covering the square and the land immediately around it, not the whole town. Windsor also has other heritage landmarks, including the courthouse and a church linked to architect Francis Greenway, and individual homes elsewhere may carry their own listings. Look up your lot on the Hawkesbury heritage map to see where it stands. If it is in the square’s area or listed, expect a development application (DA) backed by a heritage impact statement.
Can an internal renovation in Windsor trigger heritage rules?
Yes, if the home is heritage listed and the work touches fabric that is significant. In Windsor, a listed home’s interior can be just as significant as its exterior, so check the heritage record before assuming only external changes count. Shared walls also come into play in the town’s terraces and townhouses, where the neighbour may share load-bearing walls, fire separation and pipes. Either factor can steer the job away from a quick code approval toward a development application (DA). Gather the heritage listing details, title and any strata plan before the design starts.
Planning changes to a Windsor terrace: what comes first?
Start by finding out which walls hold up the building, provide fire separation, or are shared with the home next door. Attached homes were 13.9% of occupied Windsor dwellings in 2021, and many share services as well as walls. Then check the title or strata setup and any earlier approvals, since strata consent is a separate step from building approval. Only after that should the change be designed, with the whole building in mind. If the terrace is heritage listed or close to Thompson Square, look up the heritage map and flood information early too.
Building in this suburb?
Send us the address first.
We check the local maps for your lot, confirm the approval path and quote in writing.