I guess it boils down to how bad you want the house and do you feel the cost of the improvements you would have to make still makes the house fairly priced compared to what else you have seen in the market.
Back to your question is it reasonable - yes it is reasonable especially where he is a contractor, he should be able to address the shingle issue.
As to the termite abatement is there still a warranty in effect? If not you may want to have a termite inspection and get your own warranty (100-200). Non working hot water? How does he presently get hot water? (new hot water storage 800 - 1000) Non working garage door openers (small ticket items) A/C compressor is it working (if so plan on replacing down the line)
Total including roof without compressor 2500 or less. compressor 2000 ish
So you could ask for a credit, but remember unless it is cash back at closing it will only be a small percentage if you are reducing the purchase price and financng it. ie 5000 cash vs 80% financing on purchase price equals cash savings of 1000
Good luck don't let 5k stand in the way of your dream house especially in this very competitive market presently.
On some of the items you may get full credit, others partial and others none. Alot would depend upon how the negotiations went to get to the current point. Some will say it can't hurt to ask, alot would depend upon the situation of the seller and their position and motivation for selling. If you feel that you're in a strong position and there aren't other offers in the wings then perhaps it might work to attempt to renegotiate. The deadlines for this are very pressing at this phase so you need to make sure you have the time for everything. If you have a buyers agent they can best advise you and work on a game plan to go forward or walk away.
I wouldn't sweat the small stuff, but what bothered me was the shingle installation being to tight. Wood expands along its width, not lenght. If they are too tight than every year when you get really hot and humid weather they are going to expand and either buckle or start to break. This could be a big problem over the years and it is not easy or inexpensive to fix. It all makes me wonder about the quality of the work. Sealing in the roof ridge with insulation sounds like wood rot to me down the road.
This sounds like it may be an attractive home, but the issues you mentioned could cost you a bunch if they're not addressed now. My advice is to get a professional engineer/home inspector to look at these issues. It would be well worth the money spent. Even if you're had one already, a second opinion wouldn't hurt. You might also check with the building department where the home is located to see if the town has inspected the renovations and mention your concerns to them.
Although I've been selling homes for more than 20 years and have seen a lot, I'm not there looking at this house. I would get a professional to look at it and be prepared to walk away depending on what they say. I had a buyer walk about from a house not long ago as the cedar shake siding was cracking and starting to buckle. Turns out there were problems behind the siding.
Donald A Mituzas
Licensed Associate Broker
2008 Realtor of the Year
Director - Hudson Gateway Association of Realtors
Douglas Elliman Real Estate
If you are still negotiating this as a purchase, you can ask for anything.
If you have already bought it, check the warranty.
If there is no warranty - and in the other cases, too - check with your attorney.
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I would tred cautiously on this.