City of Parramatta
Private building certifier in Dundas Valley
Want to put a second level on a Dundas Valley estate cottage? Start with the old frame and footings. CertifiBuild certifies extensions, rebuilds, duplexes, granny flats and pools across these postwar lots.
NSW 2117
Class 1 homes and Class 10 structures
Local rules
Building on Dundas Valley's postwar estate
A Housing Commission estate
Farms and seed trial plots made way for Housing Commission homes from 1950. Most houses were finished by 1959. The suburb only got its own name in 2007, so that date says nothing about how old a house is. Freestanding and attached homes form the bulk of the housing, and flats are few. Plenty of houses have since been altered, extended or replaced, so look at the records for your own home, not the estate's past.
Envelope and outdoor space
How a house relates to natural ground level, and how much landscaped open space is kept, are both set by Parramatta's DCP. A modern rebuild with bigger rooms, parking and maybe a second dwelling can sit on the lot very differently to the first estate cottage. Lot sizes vary across the suburb, so work from your own survey. On a sloping site, retaining walls and a raised slab also alter the new building's position.
The Ponds Creek network
The valley drains through the Ponds Creek network. Lots close to a watercourse need drainage care, yet not every home there is flood affected. Council's lot-specific flood information decides whether extra evidence, such as set floor levels, is needed.
Typical work
Common projects and how they get approved
What owners build here
Dundas Valley jobs are mostly renewal of established homes. We regularly see:
- Upper floor additions, beginning with an inspection of the existing frame and footings ahead of design.
- Rear additions and internal reworks of postwar cottages, often opening up the living areas.
- Knockdown rebuilds and dual occupancy proposals, tested under the DCP duplex section.
- Granny flats, pools and patio roofs, which compete for yard space and drainage paths.
Sloping lots that fall toward a creek can push these structures into tighter spots, because levels and stormwater discharge decide where they can sit.
How approval usually works
A CDC (approval under state codes instead of a council DA) can suit a Dundas Valley addition or granny flat when the lot ticks every box. A duplex needs its own two-dwelling test, so a plan that only satisfies the single house envelope is not enough. Where the code does not fit, you lodge a DA and then get a construction certificate. Before lodging, obtain structural information on the existing house if going up. Check council flood and overland flow advice for lots near the creek. Raising a slab or building a retaining wall can push water onto neighbours, so settle stormwater design with the plans, not after. CertifiBuild looks at the estate history and creek mapping on your lot early, then books inspections around your builder's program.
Our services
From approval to sign-off.
One certifier for your whole Dundas Valley job, from the first plan check to the occupation certificate.
Local questions
Questions we hear about this suburb.
No two lots in Dundas Valley are the same. Give us your address and we will check every map that affects it.
See the council pageCould my old Commission house carry an upper floor?
Possibly, though the estate’s history cannot answer that. Dundas Valley’s Housing Commission homes were mostly built between 1950 and 1959, and many have since been altered, so your own frame and footings decide whether a second level is feasible. Bring a structural engineer in to inspect the existing house before design. That way the structural findings and planning checks such as height, privacy and overshadowing develop side by side. A complying development certificate (CDC) may suit if the lot meets every standard, otherwise a development application (DA) applies.
Is every Dundas Valley home flood affected by the creek?
No. The Ponds Creek network explains why drainage deserves care on lots close to a watercourse in Dundas Valley, but flood controls attach to individual properties, not the whole suburb. Parramatta Council’s property flood information decides whether your extension needs set floor levels or extra flood evidence. Lots that fall toward the creek still need careful stormwater design, because a raised slab or a new retaining wall may push water onto neighbours. Get the council’s flood and overland flow advice for your address before settling the footprint.
Could my Dundas Valley lot take a duplex instead of the house?
It might, subject to the lot, its zoning and how the two dwellings are laid out. Parramatta’s development control plan (DCP) has a separate dual occupancy section, so meeting the single house envelope is not enough. Access, open space and separation between the homes are all assessed. Lot sizes vary across the old estate, so rely on a survey of your block, not a neighbour’s plans. A complying development certificate (CDC) needs its own two dwelling test. Where that fails, a development application (DA) goes to council and a construction certificate follows.
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.