Built to last.
Finished to perfection.
Premium home remodeling and finishing across the Bay Area. From kitchens to additions, every project is delivered with old-school craftsmanship and modern accountability.
A contractor who actually picks up the phone.
Hartwell Construction was founded by Mark Hartwell on a simple idea: treat every home like it's your own. For nearly two decades we've delivered remodels and finishing work across the Bay Area — on schedule, on budget, and with a level of detail that speaks for itself.
- Licensed CA General Contractor
- Fully insured & bonded
- Detailed written estimates
- 2-year workmanship warranty
- Weekly project updates
- Permits handled in-house
Services we deliver, end to end.
From a single room to a full-home transformation, we self-perform the trades that matter most and bring trusted partners for the rest.
Kitchen Remodeling
Custom cabinetry, countertops, and full kitchen transformations built to last.
Bathroom Renovation
Luxurious tile work, plumbing, and fixtures crafted with precision.
Interior Finishing
Drywall, paint, trim, and crown molding with a flawless finish.
Home Additions
Expand your space with code-compliant, beautifully integrated additions.
Basement Finishing
Turn unused square footage into the favorite room in your home.
Decks & Outdoor
Custom decks, pergolas, and outdoor living spaces built for the long haul.
Selected projects
A small look at recent transformations across the Bay Area — from kitchens to whole-home additions.
What homeowners are saying.
"Mark and his team transformed our outdated kitchen into a magazine-worthy space. Every detail was thoughtful and the craftsmanship is incredible. On time and on budget — rare these days."
"We hired Hartwell for a full bathroom remodel and an addition. Their communication was flawless, the work spotless, and they treated our home with real respect. Hands down the best contractor we've worked with."
"After three bad contractor experiences, working with Mark was a revelation. He listens, he problem-solves, and he stands behind his work. Our basement is now the heart of the home."
"Professional from the first estimate to the final walkthrough. The deck and pergola they built will outlast me. Already recommended them to three neighbors."
Questions, answered.
Let's build something great.
Tell us about your project and we'll be in touch within one business day to schedule a free in-home consultation.