Building loft and side extension- bad quotes

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Little bro is planning a two room side extension on a 6 room bungalow and then doing a full loft conversion with 3 bedrooms and 2 bathrooms.

Planning (Edinburgh) has approved the drawings and the 1st few quotes have been stratiscopic, as in stupidly high costs.

All quotes have come back with a final price, but no breakdown.

So he plans to turn the quotes down and ask builders to offer a breakdown of the project segments.

Since he has access to sparks, plumbers, carpenters- the project could be limited to all external build (footings, brick work, structual, windows / dormers and roof / window works and the rest of the project:-
Electrics
Plumbing and waste
Carpentry and joinary
Flooring
Internal fitting
Insulation

done by others.

What's the best way of laying out a specification and item breakdown for builders?
Is there a template anywhere that could be adapted to suit this project?

Would he be better employing a quantity surveyor, who could quantify the building materials and general construction hours required or would that make most builders run away?

Since the 3 quotes received have come in between £120-£210k, there is concern that building firms could be over charging. Now he doesn't mind / expects profit for the builders- but since the spec given (all calcs, all drawings and scope of works) has been identical to each supplier why such a vast range of cost and how does he make sure that each supplier is quoting 'apples for apples'

Ta for any help- much appreciated.
 
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it sounds to me like he is doubling the capacity of the bungalow.

couple this with the fact that part of the build (loft conversion) is logistically difficult, and a lot of exiting work will have to be 'untied' before any new work can commence.

if these are quotes that will deal with ALL finishing work, then i guess you or your brother had better get saving. :eek:
 

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