House Extension Prices.
Home extension building costs can be affected by many things. One of the least
realised is location of the site. House extension builders will install prices and margins to suit the local area
and perceived wealth of the home owner.
A single storey rear extension attached to an ex-council house can cost half as much to the same size and spec.
of an extension to a detached house along a private road in a select area within a good catchment for schools.
There is no answer to this phenomenom other than being aware of the issue.
Each builder calculates their prices differently. Some use external pricing agents for a fixed fee & simply
add a margin when their costs are estimated. Others use in house computer systems or pricing books. Some simply
calculate floor areas, complexity of job and take a view.
House extension costs to the home owner are also affected by the builders margins. Busy and in demand builders
will probably add 30% profit margins feeling safe that their prestige, durability and quality of work demands the
Lesser known or quiet builders will be more competitive with smaller margins down to 5% or simply work at cost
simply to keep going during the quieter times.
The months of the year can also affect builder prices. The quiet months of November to February can often
provide the best construction prices for a home owners extension scheme.
March to September is probably the worst time for obtaining the keenest builder prices simply because they are