Mosman Council
Private building certifier in Mosman
CertifiBuild certifies new homes and house alterations across Mosman, plus decks, pools and boat sheds. Most owners first meet conservation area controls or a mapped foreshore line, and sometimes both.
NSW 2088
Class 1 homes and Class 10 structures
Local rules
Mosman: one suburb, one council, many controls
A whole council in one suburb
Mosman is both a suburb and the entire council area. It covers less than nine square kilometres and is surrounded by harbour on three sides. It became its own municipality in 1893 after splitting from North Sydney. Flats and apartments account for over half of occupied homes, yet Mosman still has plenty of stand-alone houses, semis and terraces.
Heritage and townscape
Thirteen heritage conservation areas appear in the Mosman LEP 2012. They range from estates such as Holt, Killarney and Glover and Nathans to streets including Military Road, Raglan Street and Bradleys Head Road. The residential DCP adds nine townscape areas. Townscapes sit outside the statutory heritage rules, yet they still carry character and view controls.
Three DCPs
Council uses three development control plans: one for residential land, one for business centres, and one for open space and infrastructure. Most house work falls under the residential plan. Side setbacks grow as walls get taller, starting at 900 millimetres for walls under 3.6 metres. Front setbacks follow the existing street pattern rather than a fixed number.
Typical work
Common projects and how they get approved
What owners build here
Mosman is an established harbour suburb with older housing, so most work improves or replaces existing homes rather than filling empty land. Common jobs here include:
- Renovations and extensions inside conservation areas, where the fast-track codes offer less than many owners expect.
- New homes and major rebuilds on waterfront lots, where the mapped foreshore line shapes the envelope.
- Boat sheds, swimming pools, decking and retaining structures on steep harbourside blocks.
- Duplexes lodged under the newer state housing provisions, a type of project now showing up in Mosman.
Apartment buildings are Class 2 and outside our scope.
How approval usually works
Check three things before lodging. First, check if a conservation area covers the lot. Council has pointed out that the state's newer rules for low and mid-rise homes leave out heritage items yet still reach conservation areas, while the pattern book rules leave out both. Second, does a foreshore building line cross the lot? If so it normally sets the rear limit of the house, unless neighbouring homes already establish a different pattern. Council must also be comfortable with the height, bulk, views and overlooking before you build right up to it. Third, check trees. Consent is normally triggered at 5 metres tall, but only 2 metres inside conservation areas. A CDC (a fast-track approval under state rules) may still suit some lots. CertifiBuild maps these controls for your address at the outset and books inspections to suit the build.
Our services
From approval to sign-off.
One certifier for your whole Mosman job, from the first plan check to the occupation certificate.
Local questions
Questions we hear about this suburb.
No two lots in Mosman are the same. Give us your address and we will check every map that affects it.
See the council pageCan the newer state housing rules apply in a Mosman conservation area?
Yes, they can. The state’s newer low and mid-rise housing rules leave out listed heritage items but still reach Mosman’s conservation areas, as council has pointed out. The pattern book rules are different and exclude both. Which set of state provisions your proposal relies on therefore changes the result. Mosman has thirteen conservation areas, from estates such as Holt, Killarney and Glover and Nathans to Military Road and Raglan Street, plus nine townscape areas with their own character controls. Confirm your lot’s status first, and remember tree consent starts at just 2 metres inside conservation areas.
What sets the back line of my waterfront house?
If council has mapped a foreshore building line over your waterfront lot, it normally sets the rear limit of the house, unless neighbouring homes already show a different pattern. So the limit is part map, part council judgement, rather than a tape measure from the boundary. Council must be comfortable with height, bulk, sunlight, views and overlooking before you build right up to it. Boat sheds, pools and decks on steep harbourside blocks need the same early check. Ask your surveyor to plot the line, and nearby rear building lines, so the design starts from realistic limits.
Can a pitched roof go above Mosman’s height limit?
Possibly, though council has a choice. Mosman’s residential development control plan (DCP) lets council allow a pitched roof to rise above the usual height cap where pitched roofs are a strong part of local character, or where the form suits a heritage item. Council weighs each case, so do not design on the assumption it will say yes. Show the roof against neighbouring roof lines and street views, and explain why the pitch suits the setting. Within one of the thirteen conservation areas, that heritage reasoning carries even more weight.
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.