Hi Phil,

I would try your best to find a Timberwright with a strong background in traditional vernacular historic restoration and masonry both...Most of these come with there own team of PE. I have worked with mine for over 30 years and they are some of the best in the business for both new and historic timber framing...

I personally do not recommend most "foundation contractors" as very few have any real knowledge or skill sets in traditional stone masonry and their most common solution is to reach for a concrete truck to solve all their "alleged" problems they will tell you have with your foundation...which I always find amusing since I have never designed and built a single project I'm incharge of on concrete in my 40 years of work...other than the rare occasions the soils have questionable load bearing and then I only use a natural traditional cement or limecrete...

Good luck with your project and always free to ask more questions...