nsure this is detailed, with all allowance and costs for additional works priced for. Payment should typically be in 4 stages on minor works up to £50,000 30% when the materials arrive on site, 30% at pan height/roof finished and 30% on satisfactory completion and then 10% is retained for 6 weeks payable once all building certificates are in place.
Finally get as many quotes as you have time to and ask as many questions as you can to be fully informed about the entire building process and the person you may appoint. Consider that smaller cheaper firms may be balancing more than one job at the time and not have the same resources to fall back on if their project management skills let them down!
For any further impartial information please feel free to email us your query.
Your quotation should have a full breakdown of the job and all attributed costs from approved detail/building regulations drawings. The drawing will contain a full construction specification and dimensioned drawings. You will have checked them over in detail and have the accompanying approval letters to go with them at the correct revision. Some variants cannot be accounted for on the drawings and so should been indicated as too how much they cost as drawn and should they need additional work or materials how much this will cost. Things such as drainage and foundations may require additional work once uncovered. See how the quotation is presented and laid out, if the information is lacking detail, time and effort what does that say about the man who wrote it?