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chris_e 07-22-2009 05:03 PM

cost per square foot sunroom addition
Newbie, so please excuse me if this has been covered.

I live in Northern VA -- Reston to be exact.

I just got a quote from Owens Corning for a sunroom, thought it is really an addition. This would be build on top of an existing 20x14 deck and be a finished room that would be 14 x 14. Walls would be mainly glass, two skylights. Underside of deck insulated and sealed up, and the walls have electrical outlets, are prefabed and test-assembled in the factory. they say it will take 3 days to put up on site.

so the issue is that the estimate is ~$55K. that's everything, but its also $280/sq.ft. That seems quite high, although this will be a very nice room. (we can heat and cool by slicing into a wall to get to a duct that feeds way too much H/AC to a small bedroom; walls are not finished in the package).

1. what is a reasonable price for this sort of addition (its actually '4 season' once we cut into the vent)?

2. for my wife: is an addition considered "finished" if it does not have independent HVAC? (my guess is yes)


Scuba_Dave 07-22-2009 05:08 PM

Really can't price out additons like this over the Internet
I built my own 16x17 sunroom using windows, door, slider & 6 skylights for under $15k

AC is not required for an addition
Heat usually is - but by the Insurance company

You are paying for their package
I'm sure some sunrooms will cost more, others less

Termite 07-22-2009 11:13 PM

Heat is required by code in habitable spaces of the home.

Althoughthis isn't the website for validating the estimates you receive from contractors or seeking price comparisons (this is a DIY site), rest assured that a sunroom like that won't add anywhere near $55k in value to your home like conventional construction might.

GymGuy 07-23-2009 06:31 PM

Hey neighbor! I too live in Northern, VA...Manassas. I solicited bids for a 19 X 16 (304 sqft) Screened Porch at the rear of house off family room. House has inground basement. Scope of work...pour concrete foundation, flagstone on top of concrete, two screened walls (third wall is exterior wall of morning room), shed roof w/membrane, ceiling fan, two skylights, electrical outlets and lighting. Bids ranged from $52K to $60K. About $171/sqft on the low end. I haven't yet pulled the trigger to award the work. Still kinda mulling it around.

My apologies to the website...overlooked "thekctermite" above comment for price comparisons.

Scuba_Dave 07-23-2009 06:36 PM

Wow, I've got the sunroom & a 3 story addition at those prices
I guess I should have my wife pay me :laughing:

Is a specific heat source required in a room?
My 1st bathroom doesn't have heat - rooms on either side - but it does have an outside wall
2nd floor only the small bedroom has a radiator
The rest of the 2nd floor did not - including another bathroom

My sunroom is open just over 12' to the heated kitchen

Yoyizit 07-23-2009 09:11 PM

RS Means publishes costs like these corrected for ZIP codes. Peek in one at your local Border's or Barnes & Noble.

deivismur 12-13-2009 08:14 PM

My advice would be to get more estimates and compare them. Also get a independent heat source for a sunroom after the final inspection, because rooms without heat is considered an unhabitable room and the city may not raise taxes on your room addition.

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