Sheds have many designs and shapes but usually work in square or rectangle modules. Gable or skillion roofs in multiple pitches, add a lean-to to one or both sides or a carport section to the front or rear. Keeping bay sizes to 4m and under usually helps to keep the building cheaper but we can have bays up to 6m if required which can be more economical in larger farm or commercial buildings. Standard designs are restricted to a 6m wall height and spans of up to 35m so keep that in mind when planning your project. A starting wall height for a shed can be 2.4m which will give a roller door opening of 2m if the door is close to the side wall. Usually making the shed with a wall height of 2.6m doesn’t cost much more but makes the roller door opening 2.2m and the buildings feel less cramped with a little extra height. The shed can be even lower if only pedestrian access is required. When designing a building with large spans, sometimes it is more cost efficient to add a row of internal posts to reduce the rafter size if the use of the building allows.
Often for some reason customers think skillion or flat roofed sheds are cheaper than the gable shed. They are very similar in price for comparably sized buildings so go with the design you like as a starting point rather than looking for perceived cost savings.
There are government imposed rules on how big a shed can be and where you can put it on your block to protect the character of the neighbourhood. Rescode is legislation installed by the Bracks government setting minimum requirements for siting of houses and out buildings on a property. The main areas that relate to sheds are building height on boundaries and general siting requirements. Rescode states the maximum height a shed can be on the boundary or up to 200mm from the boundary is 3.2m high from natural ground level and the slab thickness should be included in the 3.2m overall height. 1m from the boundary is allowed to be 3.6m and for every 100mm from the boundary after that adds 300mm in height. Another Rescode requirement is buildings are not to be further forward on the block than the average of the front walls of your neighbours buildings or 9m, whichever is less. Generally in your street, especially the usual suburban area you will notice a building line and it is often difficult to reduce this. There are avenues to appeal Rescode rules with your local council called a report and consent in which your neighbours will have a significant say as well as council and will rely on the character of the neighbourhood and similar buildings in the area in their judgement. There will need to be good justification as to why it needs to be considered and why there are no other alternatives. It would be wise to engage a local draftsperson to assist in the report and consent application if required.