Basement new build pricing groundworks, formwork, tanking

23 Aug 2013
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United Kingdom
Hi all

Decided to breakdown my new build basement build into separate contracts or stages to save money rather than hand over to one contractor and pay through the teeth, a lot of Qs here if you can even answer one that would be a great help and much appreciated.

My 1st Q getting prices for steel sheet piling to hold the neighbor’s boundary wall in place during the digout of the basement how’s this priced….

My 2nd Q im trying to get prices for the ground works, I need to sound like I know what im taking about how are ground works (digout basement) priced what pointers should I keep in mind.

Then we have formwork reinforced steels & concrete pour for floor and wall this I think im going to contract to one company, as it seems abit more of a complicated task to take on, any ideas on how this part is priced up.

Lastly the tanking of the basement and installation of water pumps etc will go to a specialist company any pointers on how this is priced up will be great.

I trying get back ground knowledge so that i look like i know what im taking about inorder to get a competitive price.
Thanks again for looking :0)
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What makes you think that you will pay through the teeth???

So you are looking to take on a major project, You have no experience whatsoever else you wouldn't be asking the basic Questions you have and you honestly think that you will get the whole job done cheaper??

How will you know that each trade has left it in a condition for the following trades.
Without somebody at least guiding you on site you will spend more than it would have cost to go with the one company in the beginning .

Tanking is one of the hardest jobs to get right and one of the most expensive to fix if its not done right and that includes getting the ground works and drains etc. sorted..
I concur exactly with Roger. Of all things a basement conversion is one of the most complex and difficult building jobs. If anything goes wrong it can be a nightmare to sort out.

Many of the techniques and materials are different or more extreme versions of those encountered on normal building jobs and so you need to use people and products which are tried and tested to achieve a good overall result.

Its not so much the money that you should be concerned about but the responsibility. Yes each sub-contractor will be responsible for guarantees on their part but the meshing of all of these together will be your job, and overall responsibility will fall at your door. Do not underestimate the pressure you will be under.
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If a basement is being shuttered then correctly carried out you won't need any pumps as their will be no water ingress.

The tanking membrane ( Bitusheet XL)is applied to the outside by the formwork contractor.

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