Quoting for large decking job?

Quoting for large decking job?

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Frimley111R

Original Poster:

15,913 posts

240 months

Thursday 24th September 2015
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One of our contractors has been asked about a 400 square meter decking job and although the materials are relatively easy to work out they have no idea how long it will take them, to the point that they'd prefer not to quote and leave them with a big job and no profit. They said that based on their last decking job the cost would be over £100K!! (Obviously not realistic). This is out of my area so to speak so thought someone on here may be able to help?

rufusgti

2,536 posts

198 months

Thursday 24th September 2015
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Depends entirely on the spec. But if they're not sure on how to quote they're not the team for the job and are right to shy away from it.

Frimley111R

Original Poster:

15,913 posts

240 months

Thursday 24th September 2015
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Well they can do it but this is the biggest one they've been asked about. Everyone has to start somewhere.

MrSparks

651 posts

126 months

Thursday 24th September 2015
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Do they do proper estimating or do they guess the materials and time, add a bit then give a figure? I'm guessing the latter and they deal with smaller jobs so their pricing just seems to work.

I'm an estimator by trade (electrical) and whilst I don't do decking etc, in theory it's the same.

In short... Work out how much kit they need, put it in a spreadsheet line by line, add a realistic fit time for each item. i.e you need X lengths of decking and one length of decking will take Y amount of time to lay and screw down, times X by Y and you should get a realistic fit time. Do this for every bit of material needed, decking, frame parts, screws, even for labour elements like digging holes etc, The more detail you go into the more accurate the costings will be..

Then add a material cost to each line item from above.

Then add a material mark up for profit on each line item for material.

Then add a labour cost per hour.

Then add a labour mark up per hour.

After that it's just formulas in excel really... one template should suit for most jobs.

Material cost per unit * number of units
Material mark up per unit * number of units
Fit time per unit * number of units
total fit time * labour cost
total fit time * labour mark up

total cost being material cost + material mark up + total fit time cost + total fit time mark up.

Don't forget operational costs, overheads, travel etc if necessary. Hopefully they'll have the first two items known already in their "cost per hour price".

Hope that makes sense. But a fairly simple spreadsheet could be knocked up quite quickly to allow easy, quick estimating on a small scale. Just make sure they are realistic with their fit times to start with, then fettle it afterwards. They must have a rough idea of how long they think it'll take them..so once the spreadsheet is complete divide the total hours by 40 and it'll tell you how many weeks (or do it by days if smaller) is allowed on the job, then it's just a bit of common sense as to whether it seems realistic or not.

Don't forget as well that 40 hours is a week for one person, but it's only 2.5 days if you're using two people...and so on and so on...

Edited by MrSparks on Thursday 24th September 19:12

Sunnyone

148 posts

119 months

Thursday 24th September 2015
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Ring around until someone will give you a ballpark figure and use that. Do the job, hope you don't lose and next time you will know exactly what to quote.

BGARK

5,532 posts

252 months

Thursday 24th September 2015
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Can you compare to a smaller job you have done and multiply up into this one, at least as a reference point?

Frimley111R

Original Poster:

15,913 posts

240 months

Friday 25th September 2015
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BGARK said:
Can you compare to a smaller job you have done and multiply up into this one, at least as a reference point?
They did but that came in at over £100K. I guess there are economies of scale to be had!

jdwcd

2,517 posts

208 months

Friday 25th September 2015
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Send me a pm and I will respond with my number for you to call. Should be able to help or give you some pointers

b0rk

2,356 posts

152 months

Sunday 27th September 2015
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Well 500sqm of decking alone would attract a substantial discount on materials vs small orders from a local D&Q shed or merchant. Try getting the materials quoted by a specialist timber merchant or distributor.

100k suggests they think it'll be £200sqm which sounds about quadruple to double what it should be.

joshcowin

6,911 posts

182 months

Thursday 1st October 2015
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If you send a PM we can have a chat about it. Is the Job in the South East?

homeimprovements

196 posts

181 months

Monday 5th October 2015
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Frimley

If the job is anywhere near the camps/ Lincolnshire border we would be happy to have a chat with you about the job. We have just recently completed 120sqm of composite decking near Peterborough

Regards
Nigel

lunarscope

2,895 posts

248 months

Monday 5th October 2015
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My decking jobs (standard softwood) come in at around £100 per square metre. A lot depends on the ground levels, height of decking, shape, etc. Most of the work is in ground preparation and building the frame. On a large deck there would be a lot of work getting it level (with 5% slope for rain runoff).
Off the top of my head, for a residential, low-level, rectangular deck of 400 square metres on level ground, I'd expect the cost to be around £60K, allowing for some contingency. Of course, if it's a commercial job, with the possibility of use by the general public, everything has to be over-engineered for safety (a deck that size could accommodate hundreds of people at once). In that case, I'd want to use a steel frame, which would increase the cost dramatically.