Looking at possibly purchasing a new house and would like to add a master bath/closet and bring the laundry in from the garage. Would be about 215 sqft added to the house and include reworking an adjacent sunroom that was previously closed in but not properly insulated and doesn't have enough AC running to it (likely a total redo from foundation up) In my head I was budgeting about $100 per sqft for both the addition and renovation and then $15-20k in bath fixtures etc. is that a reasonable number in todays market?

I'd say a better guess would be $200 sq/ft and I think it will still be higher than that.

New houses are being built above $200/SF. You're separating out the bath fixtures, so that makes $/SF even more difficult, not to mention such a small SF AND on a remodel. IDK what the $/SF should be and it's probably silly to price it that way. From all the stuff you're describing, I'm thinking $40k at least total, but you're just going to have to get bids for this to really know any better. Which means you need to have good drawings and scope. Good luck with all that.

Building a house now and you'll need budget a lot more per sqft. Labor prices are the driver. Materials have generally come back to reality (still higher but not astronomical).

streetfighter2012 said:

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Looking at possibly purchasing a new house and would like to add a master bath/closet and bring the laundry in from the garage. Would be about 215 sqft added to the house and include reworking an adjacent sunroom that was previously closed in but not properly insulated and doesn't have enough AC running to it (likely a total redo from foundation up) In my head I was budgeting about $100 per sqft for both the addition and renovation and then $15-20k in bath fixtures etc. is that a reasonable number in todays market?

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a bedroom and bathroom addition in my existing basement, 2 bids, both came to $200/sf.

A full basement build-out was $60-80/sf when we moved in, 11 years ago.

Let's figure this out .... Caveat ... I do not have insider real-time costs shared with me like buyer do ...
Random Example: 1725 Hidalgo Pass Ct, for sale is ~$213/TSF (Total SF, anything with a roof/foundation) & includes the lot, fees, etc.
The wet areas typically cost more than the other rooms, historically Bath = 103% of TSF
so we begin with $220 x your 215sf = $47,300 NEW
History strongly suggests that Remodel/Additions cost 150-200% of NEW and you want to avoid Low Bidders for such as this
Do we deduct lot price but then add small job & possible barriers to the work area or call this a wash?
Me thinks a wash.

Cost additions possible
Fixtures, cabinets, fenestration & finishes selected
Supply delays & out-of-stock
Design fees - e.g. impossible roofs marriage that could include demo costs, etc.
Walls demo

Risks
Addition foundations movement over time
Leaks

When you get an average of Bids later, please post the $$/SF, OK?
We are all still learning the post-/current COVID prices & supply chain.

Forgot to add other options:
A. You wrote "buying a new house" = house has a Builder who has the plans he can get your addition designed on to it, find you a new lot, then build ala NEW costs, predicatably lower
B. Builder gives you the plans to give to architect, then bid it out on a new lot
C. You take all these ideal plan ideas/concepts - free of any copyrights - to an architect to getRdone new on new lot

This is the response I've been waiting to read.

10 years ago I did a bathroom addition for a customer and the plumbing cost alone was $100 per square foot

There are too many variables here to guess but if a 2000 square-foot new construction house is costing ~$200 a foot, Then an addition is probably gonna be anywhere from 300 to 400 psf as a rough idea. Things really start to escalate on plumbing and electrical and even HVAC if you have to add an additional unit or upgrade the existing one's size.

Certain materials are starting to move pretty good again


1/2 inch osb Has increased 90+ percent in the last four weeks

JP76 said:

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Certain materials are starting to move pretty good again

1/2 inch osb Has increased 90+ percent in the last four weeks

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Glad we're fully enclosed and moving onto insulation!

"History strongly suggests that Remodel/Additions cost 150-200% of NEW "

Tad speaks from years of experience

Thank you all for the responses, just trying to get some ballpark figured on budgets. I read through my original post and need to clarify some things. The house we are looking to purchase would be new to us not new construction. It was built in the 50's and is a 3/1. We would be adding the master bath/closet/laundry approx 215 sqft to one of the bedrooms. The "sunroom" is another 225 sqft that is a possible remodel or tear down and rebuild and would be determined once we get some more into inspections and walk with contractors.

The point everyone is making is that adding sf to an existing home is more expensive per sf than building the equivalent space as new construction. The process is more complex and has more unknowns that take more time money and effort than when you control everything with new construction. So if a new construction home is $200+/sf, a remodel addition of the same home is going to likely be >$300+/sf for the same finishes.

Where are you?

Sqft cost is a pretty useless measure for multiple reasons, but, when doing a remodel, especially if you're doing mostly bathroom and kitchens, the sqft cost is higher than you'd expect. It's because it's expensive square footage and you don't have the cheap sqft to spread the cost over, like if you were building new or gutting everything

Since we're talking pricing guesstimates, thoughts on attached garage and room above it? Piping really easy to connect.

Located in central Houston. Again thank you all for the information.

Just impossible. So many factors.

We did an add on 3 years ago. Half bath, full bath, bedroom and some bonus space. All off the back of the house (new slab, tied in to existing structure). Bids came in around $180-$190/sqft. After it was all said and done it ended up just over $200/ft for the build and permitting. That did not include drawings, etc.

Some materials are down right now compared to then, but labor ain't cheap.

You need to mentally prepare for $250-300/sqft easy, and that's basic finishes… and you need to mentally prepare for things to go mostly as planned, but also deal with the nuances of adding on to a 70 year old house.

Get good drawings. Get several bids. Meet the contractor on site and discuss the job in full detail. See other jobs if possible.