Home Additions and Remodeling in Star, ID

In Star and across the Treasure Valley, Comfort Expert Builders adds space to the home you already have. We build second stories, bedroom suites, rooms over the garage, garage conversions, bump-outs and bigger living rooms. When your kitchen or layout needs to change to fit the new space, we remodel it as part of the same project. Call (208) 991-8068 for a free estimate.

25+ Years of Experience

Custom Design & Build Approach

Licensed, Bonded & Insured

Local & Trusted in the Treasure Valley

Add Space Without Leaving Home

Moving is expensive, and it means leaving a neighborhood you like. An addition gives you the room you need right where you are.

On this page you’ll find the kinds of additions we build, how the process works and what to expect. Every project starts with a free estimate and a visit to your home. We look at your lot, your house and how your family lives. Then we plan the new space so it fits the home, the lot and the budget.

Most families can stay in the home while we build. We work with you on a schedule that keeps daily life as normal as possible.

Home Additions in Star and the Treasure Valley

A home addition adds new square footage to your house. It might be one new room or a whole new wing. We match the new work to your existing roofline, siding and windows, so it looks built in, not bolted on.

This is the core of what we do. Families add on for a new baby, a parent moving in, a home office or just more room to breathe. Whatever the reason, we plan the addition around how you’ll use it every day.

Learn more about home additions →

Second-Story Additions

When your lot is tight, building up can make more sense than building out. A second story can add bedrooms, a bathroom or a family room without giving up your yard.

A second story puts new weight on the home you have. So we plan the framing and structure to carry it safely, and we tie the new floor into the old one cleanly. We also plan the stairs so they fit the way you move through the house.

Bedroom Suites and In-Law Suites

A bedroom suite gives someone their own space: a bedroom, a bathroom and sometimes a small sitting area. It works well for a parent moving in, a grown child coming home or guests who stay a while.

We plan the suite so it has privacy and still connects to the rest of the house. If you’d rather have a fully separate home on your lot, take a look at our ADUs instead.

Learn more about ADUs →

Garage Conversions and Rooms Over the Garage

Your garage already has a slab, walls and a roof. That makes it a strong starting point for new living space. We can convert it into a bedroom, an office or a family room. Or we can build a new room on top of it.

One family had us build an addition of about 1,400 sq ft above their garage. Building over the garage adds space without taking up more of your yard. If you still need the parking, we can plan a new detached garage too.

Learn more about detached garages →

Living Room, Kitchen and Bump-Out Additions

Sometimes a room is just a little too small. A bump-out pushes one wall out a few feet to make a living room, dining area or kitchen roomier. A living room addition goes further and adds a whole new gathering space.

We don’t take on kitchen remodels by themselves. But when your addition connects to the kitchen, we update it as part of the job. The plumbing, electrical, cabinets and layout all get planned together, so the work isn’t done twice.

Sunrooms, Home Offices and Guest Suites

Some additions are about how you want to spend your day. A sunroom brings in light and a view of your yard. A home office gives you a quiet place to work, away from the busy parts of the house. A guest suite makes visits easier for everyone.

Each one gets the same care: framing, insulation, heat and finishes that match the rest of your home.

Whole-Home Remodeling With Your Addition

An addition often changes how the rest of the house flows. Once the new room is in, the old layout may not make sense anymore.

When that happens, we plan the remodel and the addition as one project. Walls can move, rooms can change purpose, and the new and old spaces can connect the way they should. We don’t do standalone kitchen or bathroom remodels. We remodel when it’s part of a bigger plan that adds space to your home.

Questions to Answer Before You Add On

A little planning up front makes the whole project smoother. Before we draw anything, we’ll talk through a few questions with you:

  • How will you use the new space? A bedroom, office or family room each needs different light, heat and access.
  • Up or out? Your lot size, setbacks and yard decide whether building up or building out makes more sense.
  • What else needs to change? Sometimes a hallway, stairs or kitchen needs to shift so the new room connects well.
  • What matters most? Some families want the biggest space for the budget. Others care most about a certain look or finish.
  • When do you need it? Permit timelines and the season affect when we can start and finish.

Your answers shape the design, the plan and the estimate. There are no wrong answers, and we’ll help you think each one through.

Permits for Home Additions in the Treasure Valley

An addition changes your home’s footprint, so it almost always needs a building permit. Each city sets its own process. For example, Caldwell has a separate residential addition permit packet, and Boise has its own permit type for residential additions and alterations. Outside city limits, the county handles it.

We check the setback and zoning rules for your lot early, before design is final. Then we pull the permits and work with the inspectors through the build. If you’re in an HOA, we’ll help you get their approval too.

Older homes in established Boise or Eagle neighborhoods often need more structural matching than newer homes in Star or Middleton. We plan for that up front, so there are no surprises once the walls open.

How a Home Addition Project Works

  1. Free estimate and home visit. We see the space, look at your lot and talk through what you need the new room to do. There’s no trip fee.
  2. Design and plan. We lay out the addition, match it to your home and put together a plan with the scope, timeline and cost.
  3. Permits. We handle the plans and permits with your city or county.
  4. Build. The same crew works your project from first framing to final finish.
  5. Final walk-through. We walk the finished space with you before we call it done.

You work directly with the owner the whole way, not a sales rep or a string of subcontractors.

Home Additions Across the Treasure Valley

We’re based in Star. We build additions in Star, Boise, Eagle, Meridian, Nampa, Caldwell, Emmett, Kuna and Middleton.

See the areas we serve: Star, Boise, Eagle, Meridian, Nampa, Caldwell, Emmett, Kuna, Middleton.

Additions are one part of our work. We also build custom homes, ADUs, shops and garages. Get to know our full-service construction company in Star.

Why Families Choose Comfort Expert Builders for Additions

  • Family-owned and licensed. Locally licensed (Idaho RCE-58473), with 25+ years building in the Treasure Valley.
  • You work with the owner. Not a sales rep, not a subcontractor.
  • One crew, start to finish. The same team from framing to final walk-through.
  • Additions that match. Rooflines, siding, windows and finishes planned to fit your home.
  • Quick answers. Most calls get a response the same business day.
  • Free estimates. No trip fee to come look at your project.

What Our Clients Say

Posted on Google Google
Arturo Davila profile picture
Arturo Davila
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Alex came in and did exactly what he said in a timely manner, his employee was excellent and very professional, I would highly recommend them and will definitely use them in the future.
Posted on Google Google
Cora Wayenberg profile picture
Cora Wayenberg
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
First time doing any kind of construction and an ADU above our garage was quite the experience! Alex was good at letting us know each step of the way. We had a hiccup with cabinets....but even with that delay, project was done within a week of when he said it would b done! I've been told, in the construction world, that's miracle! He worked with us to keep us within our budget....even assisting on some areas so it would b amazing! I loved that he didn't "nickle & dime" us to death!! Anything extra needed was carefully shared & explained. The finished product is so much more than we could have hoped for & admired by all who view it! Thank you Alex & CEB!!
Posted on Google Google
Evy Lobkov profile picture
Evy Lobkov
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
did a great job with our house remodel!! very professional and made sure we got what we wanted. would recommend
Posted on Google Google
Reagan Olson profile picture
Reagan Olson
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
We recently had the pleasure of working with Alex from Comfort Expert Builders, who completed a ~1400SQ FT addition above our garage. From start to finish, Alex was great to work with. He was professional, approachable, and always ready to address any questions or concerns. His team moved quickly and completed our project in an impressive 3-months! Throughout the project, Alex maintained excellent communication, keeping us informed of progress and any potential issues. The construction estimate was accurate, and there were no unexpected costs or surprises. His level of honesty and reliability is rare and highly appreciated. Overall, I would highly recommend Comfort Expert Builders for any home construction projects.
Posted on Google Google
Zach Redd profile picture
Zach Redd
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Comfort Expert Builders, is a great business partner of ours in the treasure valley. As a Business owner myself, I appreciate good communication, reliability, and expertise is ones field. That’s exactly what you get with Alex and his team. I highly recommend them to anyone building in the area.
Posted on Google Google
olga derbis profile picture
olga derbis
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Alex and his team have been a pleasure to work with! First of all, always easy to communicate with, and responding in a timely fashion. We always felt comfortable asking questions, and if a change in the plan was needed, they were accommodating and patient. And secondly, very professional and work quality speaks for itself. Would definitely recommend to friends and family!

Home Addition FAQs

How much does a home addition cost?

The cost depends on the size, the type of addition and how finished the space is. A bump-out costs less than a second story. We give you a clear estimate after we see your home and learn what you need.

How long does a home addition take?

It depends on the size of the addition, the permit timeline and the weather. We give you a timeline for your project during planning and keep you updated as we go.

Can we live in the house during the addition?

Yes, most families can. We plan the work and the schedule with you so daily life stays as normal as possible.

Does a home addition add value to my home?

An addition adds square footage and usable space. How much value it adds depends on your home, your neighborhood and the market. A local real estate agent can give you the best read.

How do people pay for a home addition?

Many homeowners use savings, a home equity loan or a refinance. Talk with your lender about what fits. We’ll give you a clear estimate you can take to them.

Do you do kitchen or bathroom remodels on their own?

No. We remodel kitchens and baths when they’re part of an addition or a larger project that adds space to your home.

Do I need a permit for a home addition?

In almost every case, yes. We pull the permits and work with the inspectors for you.

Get a Free Estimate on Your Home Addition

Ready for more room? Call (208) 991-8068 or fill out the form. Tell us about your home and what you’d like to add. We’ll set up a time to come take a look.