Celtic Building Company, LLC

Residential Remodels, New Construction,
Commercial Tenant Improvements



Sandy - Colleague

James and I worked on several commercial interior design/installation projects during 2012 and 2013 and I highly recommend him. His integrity, attention to detail and customer care was top notch. When he was responsible for the project, I no longer had worries of it being carried through in the best manner it could be. His architectural background made for easy communication and understanding with all the construction trades people and could walk clients through the process with knowledge and understanding.


Clay & Wendy -

James is a great personable guy who I've really enjoyed working with. He's the type of contractor you only give his number out to your best-best friends because you always want him to be available for your next job.
My wife and I have done two remodels with him in two different houses. I like that he comes up with smart, cost effective remodel solutions that accomplish the goals of the project.
We have just had him over to take a look at a large remodel on our third house and look forward to using his services.


Carl -

I have used James MacIsaac on several projects both at my home and for my company. They included consulting and subcontracting. He is knowledgeable, forthright and detail oriented. I highly recommend Celtic Building Company and James.


Dave & Jenn -

James did a great job building our dream house in Boise and we could not be happier! He helped us through the entire process; selecting a lot to purchase, drawing up plans, making recommendations on finishing materials, and everything in-between. We were very impressed by his willingness to answer every question about every little detail and he was great at communicating with us in a timely manner. James spent hours on the construction site to make sure contractors did things right and followed up as needed. The neighboring property owners really appreciated him keeping the site as clean as possible during construction. We have received numerous positive comments about our beautiful new home and we highly recommend Celtic Building for your next project.


Jim & Jan -

James provided general contracting services for a 600sq ft., $65,000 addition to our foothills home, during the 11/2009 to 2/1010 timeframe. He was very easy to work with, and delivered 100% of what he contracted for, and in a very timely manner. He had good rapport with his subcontractors, and they delivered the finished product under his direction and coordination.

We would not hesitate to use him for any future home projects that we might have in the future.



Jeff –

I have been involved with James MacIsaac professionally for approximately 20 years.  He does not compromise his integrity, eye for quality or value proposition for his clients.  He consistently demands the best from himself and his suppliers and subcontractors.  I believe it is this level of commitment that enable Celtic Building Company, LLC to distinguish themselves from their competitors.


Danny –

I am a Real Estate Broker here in the Treasure Valley.  I have worked with James, sold properties with him and for him.  New construction and renovations.  He is reliable, trustworthy, and knows the building/renovation business well.


James with Celtic Building Company is always at the top of my list to recommend to family, friends, and clients.  Feel free to contact me with any questions.


Daniel Riess – Broker

Realty Market Brokers



Emmett Price

My relationship with Celtic Building Company spans over 25 years.  In capacities ranging from estimating, managing client relationships, drafting, construction management, and financial reporting.  I have not been disappointed in any of these areas.  These are just a few of the services that have been provided to me by this company.  I continue to work with Celtic Building Company and highly recommend them to others.


Emmett Price – Owner Emmett Price Homes