hi there,
may i suggest that you search 'builders clean' in the forum, as there is a lot on here at the present time.
your post, provokes a number of questions--
size of plot, number of cleans required, one off, or are you going to get the full site.
electric and water on, spec from the builder.
110v or 240 v vacuuming requirement,
window cleaning, ground, first, second etc
any core units to be done.
any jet washing?
payment terms from builder,
CIS registration card, or tax certificate?
etc, etc.
where in the country are you?
feel free to ask questions.
all of the above would provide a good grounding for a sensible pricing structure.
regards
martin