Concrete cost sound right?

[scottzilla]

I've been getting quotes for a 24x24 slab built to local code (Footers, 4' frost wall, 4-6' slab) between $7200-$7800, excavation included with back fill.
One company told me $125 per yard and this is a 28 yard job.
So in reality, I seem to be paying as much for excavation as the concrete itself.

 

[rieferman]

Location will have something to do with it. Here, near Philly, if you're paying for excavation, form work, pour, finish.. That doesn't sound too far off to me.

 

[toolchaser]

I don't know your location, but I had some #3000 psi poured about 2 months ago @ $95 per yard

 

[DHS]

Concrete is about $100 yard around here also. Sound pretty cheap to me.

 

[scottzilla]

Thanks for the feedback. I guess i'm doubting paying $3500+ for prepwork.

 

[metal1313]

yea that isnt bad. thats alot of work and material to do the job. i may not me too far off that price for a smaller slab

 

[Gary S]

It sounds reasonable to me for the concrete and the labor.

 

[NUTTSGT]

I'd try to get a few more prices as comparables. With the slow econmy, I bet you can find somebody cheaper.

 

[brownbagg]

considering a four foot frost wall, it really a good deal

 

[Kevin54]

Around here that would be high by a couple of thou. In your area, probably about right.

 

[Teikas Dad]

I put in a 20' X 32' slab in October. It's a frost protected shallow foundation, so it's only 2' thick at the edges, 7" slab in the center. Wire reinforced, plastic vapor barrier, excavation and 20 yards of concrete for $5000.00.

I had never heard of a frost protected shallow foundation, it was recommended to me by my local building inspector...so it meets code requirements.
http://www.toolbase.org/PDF/DesignGuides/revisedFPSFguide.pdf

 

[scottzilla]

Thanks! I'm on LI, btw.

 

[ymerej]

I'm in Maryland and just had a foundation put in with the same footprint (24x24), but a foot shallower side walls. Everything was poured concrete - footer, walls, and 4" slab. The cost was just over $8k done last September.

 

[tdkkart]

So in reality, I seem to be paying as much for excavation as the concrete itself.

You're paying for excavation, rebar, forming, pouring and finishing.

Just about every concrete job I've seen you can basically figure up the concrete needed, x cost/yd, and then double it to get your total cost.

 

[bluesman2a]

Just about every concrete job I've seen you can basically figure up the concrete needed, x cost/yd, and then double it to get your total cost.

This has been my experience as well. Of late you can get some deals since a lot of guys are just trying to keep their crews paid.

 

[walrus]

If you have a frost wall, you have 3 pours. One for the footer, one for the walls and then one for the slab. that makes it expensive

 

[scottzilla]

Good info.

 

[sharage71]

Building 24 x 30. concrete was 2400.00. Rented mini excavator 250.00. 20 yds of Crusher run gravel 400.00. Plate compactor rental 100.00. Rebar 3/8 on 18" 1/2 in footings 250.00. Formed myself. Sub-contracted place pour and finish with power trowel .50/sq ft 360.00. It is a mono-lithic slab
Lots of my time FREE.00. Right at 3800 for the slab.

 

[kwb]

The quote sounds in the right ballpark for what there is to do what you listed. Compare apples to apples- a monopour is a long shot from what you have quotes for.

Figure you are going to have a guy on a machine for 8-12hrs between digging, back fill, and moving some crushed around. Even a guy on a small machine is going to get close to $100/hr if he is any good paying taxes/insurance bonded, etc. A guy that isn't very good or not operating above board will take more time so make sure bids are fixed price and not by the hour.

Concrete itself is going to be $100/yd at a minimum.

It will take a finisher the better part of a day to get the floor right - He gets $400 min.

Rebar, crushed materials, foundation drains.... all add up.

 

[krooser]

Can't you just use a floating slab and skip the frostwall?

 

[Daniel Dudley]

If you hired an excavator, and did everything else yourself, you might save 2500.00.

Maybe a tiny bit more.

What some do is put in the foundation walls now, build the garage, and pour the slab after the garage is built. You can usually find a guy to help with the slab over a weekend for a few hundred dlooars, but they don't always come out looking like the polished beauty a pro crew would provide.

I did a floating slab for myself a few years back on bank run gravel with a hefty perimeter and a boatload of rebar. Between the excavator and the concrete costs, it was almost 4000.00.

 

[scottzilla]

Can't you just use a floating slab and skip the frostwall?

It is my understanding a frostwall is a code requirement.

 

[kbs2244]

Check on the need for a frostwall.
It is almost always required for an attached garage,
but may not be required for a detached.

 

[Shocker]

I am about to have a 9x24 slab poured (search for my lean to carport addition). 5" slab, rebar and WWR sheet. 12" stem wall on the outside (that side sits up against a hill, trying to protect from drainage).

Light broom finish, 6 sack all done for about $900.

I felt like I got a good deal.

 

[Teikas Dad]

It is my understanding a frostwall is a code requirement.

scott...take a look at my earlier post about the frost protected shallow foundation. It's a monolith pour, only 2' deep on the edges with a 7" slab in the center. It meets building code because my building inspector is the one who recommended it to me.

 

[tdkkart]

scott...take a look at my earlier post about the frost protected shallow foundation. It's a monolith pour, only 2' deep on the edges with a 7" slab in the center. It meets building code because my building inspector is the one who recommended it to me.

Code here says that the need for a frost wall/footing is dependant on the size of the structure. 1250sf and above has to have frost foorings, anything below that can be a slab with reinforced edges, unless it has other limiting factors.

Here's our guidelines for detached garages:
http://linncounty.org/files/download.asp?type=Adobe&mode=view&I=5120

 

[Justanoldguy]

Here in NZ we don't have any special frost requirements.
Also very unusual to see garage floors any thicker than 4 inches.
Unless it is for heavy duty truck work, then it's 6 inches..

Why so thick over there?
7 inches??

 

[stinkythings.com]

Hey Scott,

Check to see if monolithic pours are allowed in your area. I am Islip and I was just told by a contractor friend of mine that they are not allowed in Islip anymore.

Those prices seem in the normal range. It seems everyone I talk to that tried to save a few $$$ by going with cheaper masons always regretted it.
I think more important than price is a reputable mason.

 

[srmofo]

Im in sw ohio and last fall I paid $9500 for a 24x36 for everything. My footer was down about 42". Block walls and the slab was poured 6'ish 4500psi with fiber reinforcement. I heard that prices would be going up this year though.

By the time the driveway, walkways, and some city walk was poured I literally had twice as much in the concrete as I did in building supplies. And I have 10' ceilings with spread web trusses.

I got several quotes and mine was right in the middle, they were also only 1 of 2 companies to actually show up on site and give me a quote. I checked the local BBB and they were on it so thats who I chose. Came with a 2year warranty. Dont know how useful that is but at least they're willing to stand behind their work

 

[Mac]

My guy just gave me a quote of $3.15 per sq. ft finished in a 40x60 ft shop. That's using 4k pound fibermeshed mud including prep and rebar.

 

[tdkkart]

scott...take a look at my earlier post about the frost protected shallow foundation. It's a monolith pour, only 2' deep on the edges with a 7" slab in the center. It meets building code because my building inspector is the one who recommended it to me.

Sounds to me like your building inspector is getting a kickback for every 7" pour that comes in. The only place that you MIGHT need a 7" slab is if you're parking loaded tractor trailers on it.
Hell, around here 4 lane highways are only 8" thick.

 

[FireWrench]

I had 2400 sq. ft. (40'x60') of 4500 psi crete poured 6" deep for $8,400.00 and thats + drains and under slab insulation. What is like $3.50 sq. ft.

 

[FireWrench]

Im in sw ohio and last fall I paid $9500 for a 24x36 for everything. My footer was down about 42". Block walls and the slab was poured 6'ish 4500psi with fiber reinforcement. I heard that prices would be going up this year though.

By the time the driveway, walkways, and some city walk was poured I literally had twice as much in the concrete as I did in building supplies. And I have 10' ceilings with spread web trusses.

I got several quotes and mine was right in the middle, they were also only 1 of 2 companies to actually show up on site and give me a quote. I checked the local BBB and they were on it so thats who I chose. Came with a 2year warranty. Dont know how useful that is but at least they're willing to stand behind their work

I also heard the prices of crete where going to increase.

 

[scottzilla]

Just an update on this:
My slab is done!
$6800.00. 20x30, 4' frost wall w/rebar, footings with rebar, 4" slab poured and cured. Slab is 3500psi with wire mesh.

I'll be doing a "New Garage w/pics" thread soon.
Appreciate all the advice.

 

[TRC51]

I had a lot of drama with my build, but all said and done my 24 x 30 (with 4ft frost and 2ft knee wall and 5" slab) was a little less than $8K... and that is with excavation. About $1800 of that was excavation and that was a good price because that includes the guy coming back to fix some problems my first concrete guy created. I was getting quotes from others for the same job for $10K - 12K with excavation. For your 24 x 24, your prices seem about right.

I would definitely get some references and have the guy put down in writing what he is going to do for you. I went through so much drama. Make sure the guy is working with a crew too. My guy was a big concrete business, but turns out he was doing all the work on Saturdays by himself to avoid conflict with his big contracts. Basically weekend cash for himself. That hurt me and my schedule.

 

[december45]

If youre interesting in dropping the cost, "sharage" sounds like he has the right idea, When I had the electrical run to the shop, the cost to dig the ditch to the shop (about 200') ranged from almost $5000.00 to $400.00, get lots of bids.
* the guy who gave me a price of almost $5k seems to have lost his "McMansion" and now lives in our neighborhood, and is down to just one backhoe, which he operates, I'm assuming his prices have dropped to be more inline with todays economy.

 

[scottzilla]

I plan on doing a complete garage build thread and will reveal prices paid and quoted for everything. Most guys were at least fair but a few were absolutely out of their mind with some of the prices they quoted.

 

[Cryptic1911]

You're paying for excavation, rebar, forming, pouring and finishing.

Just about every concrete job I've seen you can basically figure up the concrete needed, x cost/yd, and then double it to get your total cost.

yep, this is how it went for my addition..