Basement build question.

[bongta029]

Hi,
I currently have a setup in my basement that has 9' ceiling.
with all the dricore, putting green, and the mat, it becomes about 8"7. I can swing with a driver but scratch the ceiling occasionally.

I'm trying to move to a new house that has a garage on the first floor and is big enough to put 6 cars. I want to convert half of it into a golf studio. Unfortunately the ceiling is only about 8'7", so I think I need to dig about 1 ft.
how much does it usually cost to dig 1' that's about 24x24'?
who do I need to consult?
is there also an option to raised the ceiling without damaging the support?
*updated*

[Hickory James]

Can you raise roof with Gusset panels - I went from 7 ft to 10.5

[bongta029]

Can you raise roof with Gusset panels - I went from 7 ft to 10.5

That's awesome. How do you do that in the basement?

[wildcatfan9698]

That's awesome. How do you do that in the basement?

you don't touch the structure in a basement, really bad idea, considering what's above it.

[Brettster]

bongta029 - I was quoted $14,500 to dig about 2.5’ down in a 12’ x 16’ area in my basement… the dirt would be removed through a side basement window.

I’ve moved away from that idea - and have spent about $3,000 on updating my 12’x16’ barn/shed instead… more bang for buck - and better sound isolation for me that way. I’m almost done - but now realize I have to install a mini-split to get enough heat into building! See my post up here under Simulator Builds…

If you want it quoted contact either Concrete companies or structural engineers… good luck

[hoos1990]

i’ve been looking into this. There are a lot of variables that affect the cost, but you can count on a bare minimum of $10,000.That’s if they just have to tear out slab, dig down, pour a new slab. To go down a full foot though they will most likely have to reinforce the existing footings. you may well know this, but most foundations are built on poured concrete footings. these typically go down about 8 inches more or less.. If you dig down below them, you undermine their ability to support your house. you would need you pour new footings under the existing ones. So then you are getting much more expensive. On the high end could be 20 to 25k. You just need to speak with a reputable concrete contractor in your area. Smaller guys likely won’t do this work so probably need to look for a larger firm.

All of the above is what i’m seeing in the mid atlantic. If you are in the north east or florida or arizona, could be very different.

[dwise2613]

I went up instead of down.

[mthunt]

What did you get with that? 8”? It’s pretty good.

[dwise2613]

Yeah, give or take. If I did it again, I'd do a tongue and groove wood ceiling, and would have gone one more joist to cut out.

The steel tubes are 4 X 4, with a 2 X 4 in between to screw the drywall into.

[mthunt]

i’ve been looking into this. There are a lot of variables that affect the cost, but you can count on a bare minimum of $10,000.That’s if they just have to tear out slab, dig down, pour a new slab. To go down a full foot though they will most likely have to reinforce the existing footings. you may well know this, but most foundations are built on poured concrete footings. these typically go down about 8 inches more or less.. If you dig down below them, you undermine their ability to support your house. you would need you pour new footings under the existing ones. So then you are getting much more expensive. On the high end could be 20 to 25k. You just need to speak with a reputable concrete contractor in your area. Smaller guys likely won’t do this work so probably need to look for a larger firm.

All of the above is what i’m seeing in the mid atlantic. If you are in the north east or florida or arizona, could be very different.

There’s two methods of doing this properly and neither will effect your foundation in any way. First, you can do a bench under pin. A bench is a way of lowering the floor with an internal wall. IT has to be 1 foot thick for each foot of depth so 2 feet deep and 2 foot bench. The other is an underpin. Underpinning is taking the footing you mentioned and making it deeper with concrete by putting concrete below the footing. You can do that as deep as you like. Both a fully safe and neither will hurt your house.

[bongta029]

I went up instead of down.

I like that idea much better than digging. How much did it cost if you don't mind me asking.

[dwise2613]

Well, just the steel tubes and labor was $8k, but I had to move a bunch of HVAC and electrical myself too.