How Much Will it Cost?
Rates from 1 March 2010 but subject to change without notice.
to the many variables involved in the size and complexity of domestic
roof structures it is impossible to give a direct answer to this
question which equates to "how long is a piece of string?"
The following information is given as a guide to an approximate cost for new houses. (This will include all alterations/additions to residential property, no matter what size)
Some of the variables which determine the cost, apart from the size of roof area, are:-
guideline prices include for all statutory certification by a registered
professional engineer as required by local authorities and the National
Home Builders Registration Council.
is a lot of confusion in the home building industry in regard to an
inspection fee for roof structures especially when 1.3 per cent of the
value of the property is paid to the
of its statutory nature the
NHBRC must comply with the requirements of the National Building
Regulations. If construction is undertaken in accordance with what are
known as "deemed-to-satisfy" rules the NHBRC's own
inspectorate will inspect those elements of the structure which fall
under their warranty scheme. i.e. foundations, walls, floor slabs, roofs.
when one of these items is the subject of an engineers
"rational" design it can only be inspected and signed off by
that engineer in conjunction with his/her duly authorised
representative. This, unfortunately, is an engineering service which has to be
paid for as an "extra" whether it be for a slab or a
foundation or roof etc.
To avoid having to pay extra for a roof inspection a home builder can elect to make the trusses on site in accordance with the NHBRC’s Home Building Manual. However, this approach would probably lead to a serious "false economy" in terms of the overall cost of the roof structure and would not provide the homeowner with a specific engineer's certificate for the roof structure. In addition, the NHBRC’s inspectorate can only inspect "gable to gable" roof structures not exceeding eight metre span and within the range of 15 to 35 degree slope. Even if the trusses are site made an engineer would be required for the design of girders for the hip and valley constructions and for any truss greater than eight metres span, or not within the roof slope/pitch range.
The NHBRC only has a mandate for brand new houses and has no
jurisdiction over alterations/additions to residential property.