Splitpi
Active member
I came across this site while researching pre-stressed flooring. I really like the information that the community provides and wanted to participate aswell.
My wife and I are planning on building a new home in the next year or two. I have alot of hobbies, wood working, old cars, etc... and so I am interested in the garage/shop areas. My wife, is concerned about everything else.
Anyways, the plan my wife likes has 24x31 attached garage with the 3rd stall indented by about 2 feet. I intend to talk to the builders and see about having it pushed by 4 feet to be 28x31 so I have plenty of space at the nose of the cars for a work bench. The roofs ridge line runs perpendicular to the garage entrance, so it should just be an increase in material issue and not impact the roof slope in any way.
The other thing that I want to consider is going with an excavated space under the garage where I can setup my wood shop, man cave, what have you. Hence the research on pre-stressed concrete planks. I am trying to estimate costs so that I am in the right frame of mind when I talk the builder and know if is a real number or a number to discourage me because he doesn't want to do it.
So here is my "basic" math:
24 x 31 std garage = ~ 744 Sq Ft.
28 x 31 My garage = ~ 868 Sq Ft.
Online I see average concrete cost w/labor = $3.95 sq ft. (for the sake of simplicity lets ignore the depth of variance)
Online I have seen people say they have received quotes of $13.50 sq. Ft. for the concrete planks
If I assume a regular 6 inch pad, then:
Std Garage = 744 * $3.95 = ~$2,939
My Garage = 868 * $3.95 = ~$3,429
If I assume "basement" garage with 2.5 inches on average of concrete over the planks and 3 inch sub floor for the basement (I'll assume as 2 unique efforts).
Std Garage = (744 * 3.95) + (744 * 13.50) + (744 * 3.95) = $15,922
My Garage = (868 * 3.95) + (868 * 13.50) + (868 * 3.95)= $18,575
So it appears the cost is roughly:
Std Garage = $12,983 More
My Garage = $15,146 More
Average of ~$21.40 sq. ft.
The other option that I have seen was using steel and concrete as the support structure. I am not familiar with a cost, but if I assume a 3 X increase in cost and the basement sub floor then:
Std Garage = (744 * 3.95 * 3) + (744 * 3.95) = $11,755 or $8,816 more
My Garage = (868 * 3.95 * 3) + (868 * 3.95) = $13,714 or $10,285 more
Are these numbers even in the ball park? Thoughts? I personally think $10 to $15K additional cost is reasonable to dramatically increase the basement size and would comparable to or slightly less than building another 2 stall stand alone structure in the back yard.
My wife and I are planning on building a new home in the next year or two. I have alot of hobbies, wood working, old cars, etc... and so I am interested in the garage/shop areas. My wife, is concerned about everything else.
Anyways, the plan my wife likes has 24x31 attached garage with the 3rd stall indented by about 2 feet. I intend to talk to the builders and see about having it pushed by 4 feet to be 28x31 so I have plenty of space at the nose of the cars for a work bench. The roofs ridge line runs perpendicular to the garage entrance, so it should just be an increase in material issue and not impact the roof slope in any way.
The other thing that I want to consider is going with an excavated space under the garage where I can setup my wood shop, man cave, what have you. Hence the research on pre-stressed concrete planks. I am trying to estimate costs so that I am in the right frame of mind when I talk the builder and know if is a real number or a number to discourage me because he doesn't want to do it.
So here is my "basic" math:
24 x 31 std garage = ~ 744 Sq Ft.
28 x 31 My garage = ~ 868 Sq Ft.
Online I see average concrete cost w/labor = $3.95 sq ft. (for the sake of simplicity lets ignore the depth of variance)
Online I have seen people say they have received quotes of $13.50 sq. Ft. for the concrete planks
If I assume a regular 6 inch pad, then:
Std Garage = 744 * $3.95 = ~$2,939
My Garage = 868 * $3.95 = ~$3,429
If I assume "basement" garage with 2.5 inches on average of concrete over the planks and 3 inch sub floor for the basement (I'll assume as 2 unique efforts).
Std Garage = (744 * 3.95) + (744 * 13.50) + (744 * 3.95) = $15,922
My Garage = (868 * 3.95) + (868 * 13.50) + (868 * 3.95)= $18,575
So it appears the cost is roughly:
Std Garage = $12,983 More
My Garage = $15,146 More
Average of ~$21.40 sq. ft.
The other option that I have seen was using steel and concrete as the support structure. I am not familiar with a cost, but if I assume a 3 X increase in cost and the basement sub floor then:
Std Garage = (744 * 3.95 * 3) + (744 * 3.95) = $11,755 or $8,816 more
My Garage = (868 * 3.95 * 3) + (868 * 3.95) = $13,714 or $10,285 more
Are these numbers even in the ball park? Thoughts? I personally think $10 to $15K additional cost is reasonable to dramatically increase the basement size and would comparable to or slightly less than building another 2 stall stand alone structure in the back yard.