And how would I go about finding a reputable builder.  

I can't emphasize enough that when working with other professionals, your reputation is on the line, and that of the other professionals. 

Consider pre-loved appliances from reputable stores or online marketplaces.

While it may come at a higher cost, for a project involving plumbing, boiler conversion, and termite treatment, my strong recommendation is to opt for a reputable general contractor.

Don't go cheap and use a reputable, and probably expensive, bonded trustee.

As long as the inspection checks out and the builder has a good reputation, it may be a good idea to pull the trigger on both properties.

Funny thing is that both Brad Doran and Alan Kirkham mentioned to me over the phone how they both knew that our CPA had a reputation for being disliked and having problems with multiple clients, but yet that CPA was still working with WealthAbility and was still being paired with clients!

Without a significant reputation backing you or social media reputation thats positive it is difficult to get others to do deals with you. 

Does anyone know of a reputable management company in the area?

Funny thing is that both Brad Doran and Alan Kirkham mentioned to me over the phone how they both knew that our CPA had a reputation for being disliked and having problems with multiple clients, but yet that CPA was still working with WealthAbility and was still being paired with clients!