Australian standards and Code requirements we work to, with the source for each.
A valley gutter must be laid at more than 12.5 degrees, with at least 15 mm of freeboard and side angles of 12.5 degrees or more. Below 12.5 degrees it has to be designed as a box gutter to AS/NZS 3500.3 instead, which is a different job with different flashing.
The Code requires downpipes to sit as close as practical to where valley gutters discharge. On roofs with several valleys feeding one length of gutter, a downpipe in the wrong position overloads that section long before the rest of the run fills.
The National Construction Code allows a single downpipe to serve no more than 12 metres of eaves gutter. Long unbroken runs on Sydney terraces and wide Federation frontages often sit over that limit, which is why they overflow in heavy rain even when the gutter is clean.
Last updated: 8 October 2026
Gutter cleaning in the Inner West has its own rules: heritage areas and tight access all change how the job is done. Everything below links to the council or standard it comes from, so you can check it yourself.
Any tree 4 metres or taller is a prescribed tree in the Inner West, and pruning more than 10 per cent of its canopy needs a permit, or a full application if the property is heritage listed. Clearing a gutter by lopping a neighbours branch is exactly that situation.
Source: Inner West Council Tree Management DCPAshfield street tree records list brush box avenues in Cecil, Oak, Federal, Ilford and Orpington Streets, with prickly paperbark common elsewhere. Both shed leaf and bark year round, so gutters here fill slowly and constantly rather than in one seasonal drop.
Source: Inner West Council, Ashfield Street Tree StrategyInner West Council advises that almost any home built or renovated before the mid 1980s is likely to contain asbestos, commonly in fibro sheeting, roofing and guttering. Over 10 square metres, or anything friable, legally needs a licensed removalist.
Source: Inner West Council, AsbestosThe Annandale conservation area records terracotta, slate and some iron roofing, with a skyline of chimneys, decorative fire-wall dividers between terraces, ridge capping and finials. Those party walls between attached terraces are a recurring source of flashing and box gutter leaks.
Source: Inner West Council, C1 Annandale HCAThe Marrickville Valley flood study found 3,989 properties taking more than 150mm of water in a 1 per cent storm, and 3,151 properties still flooded to that depth in a storm as common as a 2 year event. Flat ground and slow drainage are the cause, so undersized downpipes and blocked gutters bite in ordinary rain.
Source: Inner West Council, Marrickville Valley Flood StudyWe cover Haberfield, Ashfield, Summer Hill, Croydon, Leichhardt, Annandale, Balmain, Rozelle, Lilyfield, Marrickville, Dulwich Hill, Petersham, Stanmore, Newtown, Enmore, St Peters, Tempe, Sydenham and Lewisham.
Often, yes. In the Inner West any tree 4 metres or taller is a prescribed tree, and pruning more than 10 per cent of its canopy needs a permit, or a full application if the property is heritage listed.
Little and often, because Inner West street trees shed all year. Ashfield street tree records list brush box avenues in Cecil, Oak, Federal, Ilford and Orpington Streets, and brush box and prickly paperbark drop leaf and bark year round, so gutters fill slowly and constantly rather than in one autumn drop.
If the house was built or renovated before the mid 1980s, probably. Inner West Council advises that almost any home of that age is likely to contain asbestos, commonly in fibro sheeting, roofing and guttering, and more than 10 square metres, or anything friable, legally needs a licensed removalist.
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