ATTIC & UPPER FLOOR REMODELING
More Room.
Same Footprint.
We help Twin Cities homeowners turn dusty, underutilized attics into beautiful, climate-controlled living spaces built for the way you live.
Building Since 1977.
Castle Building & Remodeling has been remodeling older Minneapolis and St. Paul homes since 1977.
We know how to work with steep rooflines, tricky knee walls, and the specific building codes that govern attic conversions in the Twin Cities. We also know how to fix the ice dams and insulation problems that make so many older attics uncomfortable year-round.
WHY CHOOSE US
Why Homeowners Choose Castle for Attic Conversions
Your attic is probably the largest untapped space in your home. Whether you need a private owner’s suite, a quiet home office, a guest room, or a rec room for the kids, finishing your attic is the smartest way to add square footage without the cost and disruption of a full addition.
Expert Space Planning
We design around your roofline to maximize every inch of usable headroom. Where the roofline is too low, we add dormers that bring in light, raise the ceiling, and meet code requirements.
Year-Round Comfort
We use modern insulation and dedicated HVAC solutions to ensure your new space is comfortable 365 days a year, while permanently eliminating the ice dams that have been damaging your roof.
The Castle Guarantee
Every project comes with three promises no other contractor in the Twin Cities offers: a Lifetime Warranty on our work, a Guaranteed Completion Date, and No Unforeseen Change Orders.
THE PROCESS
Built Around You
A simple, step-by-step approach from the first call to the final walkthrough.
We help you compare layout options, dormer configurations, material selections, and storage solutions before you commit to anything — confident decisions with experienced guidance every step of the way.
Our team manages every detail with quality craftsmanship, clear communication, and respect for your home and your daily life.
WHAT WE PLAN BEFORE CONSTRUCTION STARTS
A great remodel starts with the right decisions upfront
Here’s what our design team focuses on before a single nail is driven.
Headroom & Dormers
We assess your current roofline and determine whether the existing headroom meets code for habitable space. If it doesn’t, we design dormer additions that solve the problem elegantly while adding natural light and curb appeal.
Insulation & Building Envelope
We address the root cause of ice dams and temperature swings by properly sealing and insulating the attic floor, rafters, and any knee walls. This is the unsexy work that makes everything else perform the way it should.
Egress & Safety
If your attic conversion includes a bedroom, building code requires a safe means of egress. We design and install egress windows that meet all Minneapolis and St. Paul code requirements so your new space is legal, safe, and insurable.
Built-In Storage
The knee-wall areas that can’t be used as living space become prime storage territory. We design custom built-ins that make the most of every square foot and keep your new space clutter-free.
MATERIALS
Trusted Materials for
Attic Projects
We partner with trusted manufacturers and premium suppliers to deliver attic conversions that combine lasting performance, exceptional craftsmanship, and timeless design.
Marvin
Windows and dormers built for Minnesota’s climate
VELUX
Skylights and roof windows that bring in natural light
KOHLER
Plumbing fixtures for attic bathroom additions
Questions Before You Book?
Are there building codes that prevent me from finishing my attic into living space?
How much headroom do I need to add a dormer to my attic?
How do you get out of an attic bedroom in a fire?
Is remodeling an attic a good investment?
How much does it cost to finish an attic in the Twin Cities?
Appointment and Home Visit Scheduling
