If you need more assurance, hire a Realtor with a construction background and bring a general contractor with you to inspect. If you do not know one, ask your friends and family. Typically someone will know someone that would be happy to take a look. LAstly, research the person or company that did the work.
By no means, if you like the property, turn your back on it. Properties do not stay on the market long in Milton and you may miss out an an opportunity because you did not get the proper advice.
Best of luck.
If you truly like the home this will buy you the time and protection to address the issues that arise at the home inspection as well as your attorney can put in the clause regarding building permits.
As to permits - work done over 7 years ago is grandfathered in. (that does not mean that the work was done properly). You as others have stated would like to have the building dept sign off on the work in question.
What was the work done that you are referring to?
The main risk in buying a house without building permits on record is obviously the quality of the work and whether the work was done according to "code".
Richard Shapiro states below that you could have an issue getting a mortgage (if you need one).
It also depends on what permits you are talking about. If it is a permit for a deck or roof etc. then that should be easy enough for the seller to obtain as a condition of the sale.
If the house was built without permits, however, now there's a potiential for faulty wiring, structural problems and so much more.
If you like the house enough to make an offer, I would recommend you ask the seller to obtain permits as a condition of the sale. I would not recommend you inherit this issue as you could be asked to obtain the permits should YOU ever decide to sell.
What work has been done? What property? I may have seen it.
Let me know if I can assist.