Describe the roof problem in Seaforth and mention steep driveways, narrow access or a roof high above the downhill side. Seaforth was subdivided by the developer Henry Halloran, who held his first auctions there in November 1906, and the Bluff estate beside it was named for “the steep cliff face on the foreshore”. The Roofing Northern Beaches guides explain the work and local checks.
It’s a suburb of big family houses. In the 2021 Census, 86.6% of Seaforth’s occupied private dwellings were separate houses and 59.1% had four or more bedrooms. So most roofs here belong to a single house rather than a strata building.
Bush fire prone streets in Seaforth
Garigal National Park takes up about a tenth of Seaforth by our calculation, around Bantry Bay, and bushland runs along the Middle Harbour slopes at Bantry Bluff and Fisher Bay. About 19% of the suburb’s low-density residential zone is mapped bush fire prone land, by our calculation from council map data, on streets such as Castle Circuit, Gurney Crescent, Kirkwood Street, Avona Crescent, Bligh Crescent, Clavering Road and parts of Seaforth Crescent.
On mapped land, an exempt like-for-like re-roof must be “adequately sealed or protected to prevent the entry of embers” and use “equivalent or improved quality materials” (Codes SEPP cl 2.54). Other development on mapped land must meet the bush fire construction standard, AS 3959-2018, council says. The NSW RFS also suggests metal gutter guards, clean gutters and cutting back trees that overhang the house; see gutters and gutter guard.
Council’s map, certified on 7 August 2020, or your planning certificate shows whether your block is mapped. As council notes, the map “does not identify a property’s Bush fire Attack Level (BAL) rating”.
Rooflines below the tree canopy
About 46% of Seaforth, including about 31% of its residential land, is in the Foreshore Scenic Protection Area, by our calculation from council map data. It takes in Seaforth Crescent, Manly Road, Gurney Crescent, Castle Circuit, Battle Boulevard and Edgecliffe Esplanade, among others. Where a roof job there needs approval, the Manly Development Control Plan (DCP) 2013 asks development to “locate rooflines below the tree canopy” and use “building materials of a non-reflective quality”.
On colour the DCP pulls two ways: the reflectivity of roofs “will be minimal”, yet “Lighter colours are preferred for wall and roof materials” because light roofs reflect heat. Council weighs both, so agree the colour with council before it’s ordered.
Steep blocks and the March 2022 storms
On Wednesday 9 March 2022, the NSW RFS responded to “a landslide and tree down at Seaforth Crescent, Seaforth”, the Northern Beaches Advocate reported. The day before, Fire and Rescue NSW attended a house in Ethel Street “where smoke alarms were malfunctioning because of water leaks”. If water is getting in, see roof leaking: what to do first.
The Manly DCP has its own Potential Geotechnical Landslip Hazard Map, and load-bearing building work in its G1 area needs a Site Stability Report with the development application. Before any structural work, ask council or check your planning certificate for your block’s category.
Roofing work in Seaforth
Choose the work you’re planning in Seaforth, then describe the roof material, condition and access:
- Roof repairs: cracked and slipped tiles, ridge capping, valleys, flashings and rusted metal.
- Roof leak repairs: leaks traced back to where the water gets in, then fixed there.
- Roof restoration: clean, repair, rebed, repoint and recoat a roof that’s still sound.
- Roof replacement: old tile, iron or fibro roofs stripped and replaced, in Colorbond or new tiles.
- Gutters and gutter guard: gutters, downpipes and metal gutter guard.
Before re-roofing in Seaforth
Whether a new roof needs approval depends on the property, not just the suburb: whether it’s a heritage item or in a heritage conservation area, whether it’s on bush fire prone land, and whether the old roof contains asbestos. Your property’s planning certificate shows its heritage and bush fire status, and Northern Beaches Council explains exempt and complying development. The roofer should confirm the approval pathway with the quote. See roof replacement for the conditions.
Nearby suburbs
Common questions
Does a Seaforth re-roof have to meet bush fire rules?
If the block is on mapped bush fire prone land, yes. An exempt re-roof must be sealed against embers and use equivalent or improved quality materials, and other development must meet AS 3959-2018. About 37% of Seaforth is mapped, by our calculation from council map data. Check council’s map or your planning certificate.
Is Seaforth at risk of landslip?
Parts of Seaforth are steep, and a landslide came down on Seaforth Crescent on 9 March 2022. The Manly DCP’s geotechnical hazard map sets out the categories, and council or your planning certificate can tell you your block’s. A like-for-like re-roof usually isn’t a development application, but load-bearing work in the G1 area needs a Site Stability Report.
Do heritage rules affect a re-roof in Seaforth?
Only on a heritage item. Seaforth has no heritage conservation area. Its about 20 listings range from Bantry Bluff and Fisher Bay Reserve to Dalwood Home, the stone library, which began as a one-room schoolhouse in 1893, and a handful of houses. A listed house needs a development application; an unlisted house can usually be re-roofed like for like as exempt development, if the Codes SEPP conditions are met.
Does salt air matter beside Middle Harbour?
Middle Harbour is calm water, not breaking surf. BlueScope’s TB-1A guide, which is manufacturer guidance, sets no minimum distance from calm water for COLORBOND steel in Classic or Matt finish. BlueScope calls the table a guide only, so ask the roofer about your site.
Where this information comes from
The local details on this page come from these published pages, checked on 1 October 2026.
- Northern Beaches Council: Manly Development Control Plan 2013 (Amendment 17) · Council planning controls, last amended 15 September 2025
- State Environmental Planning Policy (Exempt and Complying Development Codes) 2008, clauses 2.53 and 2.54 · NSW planning law: minor external building alterations, including roof cladding
- Northern Beaches Council: FAQs about heritage · Local council guidance, undated
- Northern Beaches Council: bush fire prone land · Local council guidance; map certified 7 August 2020
- NSW RFS: prepare your home · NSW Rural Fire Service guidance
- NSW Planning Portal map data: heritage, land zoning and land application layers · NSW Government planning maps, used for our heritage count and area calculations
- NSW Planning Portal map data: scenic protection land · NSW Government planning maps, used for our area calculations
- NSW Planning Portal map data: bush fire prone land · NSW Government hazard maps, used for our area calculations
- NSW Spatial Services: suburb boundaries and national park reserves · NSW Government boundary data, used for our area calculations
- BlueScope TB-1A: steel roofing products selection guide · Manufacturer technical bulletin, March 2023, revision 14
- Dictionary of Sydney: Seaforth (John MacRitchie) · Local history, 2008
- Northern Beaches Advocate: Public safety round-up · Local news, 12 March 2022
- ABS: 2021 Census QuickStats, Seaforth (NSW) · Housing and household figures
