I'm looking to hire out a concrete job. I have two pieces to do. One is a
concrete pad next to my driveway that is 10 feet long by 10 feet wide and 4
inches thick. The other is a slab for a utility shed that I'm having built
and is 16 feet wide by 20 feet long and 4 inches thick. My estimates are
varying widely at this point. The slab near the drive way is ranging from
$250 to $480 and the pad for the shed is ranging $800 for the low end to
$3300 at the high end. The high estimate for the shed pad is including
supports at each corner that are 12 inches wide and sunk 20 inches deep
(which that contractor insists is needed). Code for my area requires the 4
inch slab with no supports if I am going to hook up electricity to the shed
(which I intend to do later). I live in the Atlanta area (southwest of
Do either of these seem way too high or way too low? Does anyone think the
4 inch concrete pad for the shed is insufficient? My two main concerns are
making sure a strong wind doesn't carry my shed away and that I meet code
so I can get the electrical permit.
I may have misheard him - we were both on cellphones. The price I
mentioned in the original message for each job was what he quoted, though.
However, he does have a trip minimum of $1000, which I didn't mention
because I was already over it (the other companies I called had no
I live in Australia, I think concreting costs are similar.
With that range of quotes, I suspect they are offering different things
- so I would ask some questions about what they are offering to do.
The cheapest quotes look very cheap (about $2.50 a square foot) and I
suspect he hasn't allowed for a compacted crushed rock bed and steel
reinforcement in the concrete. $2.50 a square foot seems like a
reasonable price to turn up on site, scrape the ground a bit, build a
timber frame and call a concrete truck to pour a slab.
For $5 a square foot you'd expect to get a bit of site preperation
(like some levelling and a bit of grass removed, a crushed rock bed and
steel reinforcement in the concrete.
What sort of job you want depends on how long you want the pavement to
In my house there's a lot of concrete paving done about 35 years ago
with no steel reinforcement and clay soil. It's cracked all over the
place with soil movement.
I did - they were the ones that told me that all is required is a 4 inch
slab. The permit for the building doesn't require the slab at all.
However, the electrical one does. The exact wording in the county code is
"buildings under 400 square feet most be sufficiently anchored". The key
is sufficiently, as it is not codified. I asked where in the code I could
find the definition for "sufficiently anchored", and was told there was
none. I then asked how I would be able to know what was sufficient, and
they said to ask my contractor. After I explained to him I was getting
different answers from different contractors and that I would like to see
something writing as a guide, I was told they ask the head permit guy in
the back and he makes a call based on situation. Gotta love it...
I agree with others above. It sounds like you are getting bids based
on different construction. Start with a blueprint or home drawn plan
with specifications as to what you want, i.e., site preparation, gravel
bed tamped, exact measure of the pads with any footings etc. Then get
your estimates. Just calling a company and asking for a bid to build a
pad X sq feet is not good enough.
As for pre-mix. Last time I checked several years ago, it was in the
80-100 range. Days of $50 are long gone I am afraid and then now they
are adding mileage fees to it. I have been charged a mileage free for
a plumber to come 4 miles from town for a routine service call.
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