How Much Does a Luxury Addition Cost in Utah?

How Much Does a Home Addition Cost in Salt Lake City?

If you’re considering a home addition in the Salt Lake City area, you’re probably wondering where the numbers land. Like most remodeling projects, home addition costs can vary widely depending on size, location, complexity, and finishes.

That said, there are solid industry averages that can help you plan and decide what’s realistic for your goals and your budget. Below, we’ve outlined typical costs for some of the most popular types of home additions Utah homeowners ask for.

Cost of a Home Addition in Salt Lake City

• Kitchen Expansion Cost: $50,000 to $100,000+
• Full or Primary Bathroom Addition Cost: $60,000 to $100,000+
• Mudroom or Laundry Room Addition Cost: $20,000 to $40,000+
• Detached ADU Cost: $300 to $350+ per square foot
• 12x12 Room Addition Cost: $50,000 to $60,000+

These numbers are a starting point, and your actual room addition cost may shift depending on your home's layout, the scope of work, and material selections.

Want help figuring out how much does an addition cost for your specific home? We’re happy to talk through it—no pressure, just honest insight from your trusted home addition contractors Utah team.

How Much Is a Kitchen Expansion in Salt Lake City?

A kitchen that actually works for your family? That’s a game-changer.

A well-designed kitchen expansion gives you more space, better flow, and way more flexibility—so it’s no surprise it’s one of the most popular additions we build.

In Salt Lake City, most projects can start somewhere between $50,000 and $100,000, since you’re extending the foundation and roofline to create that new square footage. Where you fall in that range depends on the size of the expansion, the finishes you choose, and how custom you want to go. Your project could go beyond this range for an ultra-luxury or complex remodel.

Lower End of the Range ($50K–$70K)

• Smaller footprint expansion that gives you just enough room for better flow without overbuilding
• Clean framing and roofline connection designed to blend naturally with the rest of your home
• Semi-custom cabinetry with solid construction, soft-close doors, and classic hardware
• Quartz or granite countertops in timeless finishes—think warm whites, soft grays, or subtle veining
• Reliable, mid-range appliances from trusted brands like GE or Whirlpool that get the job done without pushing your budget
• Durable LVP or ceramic tile flooring that can handle real life—spills, kids, pets, and all
• Standard plumbing and lighting fixtures that are stylish, streamlined, and easy to upgrade down the road
• Compact island or peninsula with seating—just enough space to gather without crowding the room

Higher End of the Range ($80K–$100K+)

• Larger footprint expansion with elevated design features like vaulted ceilings or exposed beams
• Fully custom cabinetry with inset doors, soft-close hardware, and a furniture-quality feel
• Natural stone or custom slab countertops that bring texture, tone, and timeless style
• High-end appliances from Wolf, Sub-Zero, Thermador, and other pro-grade brands
• Statement lighting and custom range hood, plus layered task lighting for everyday function
• Heated tile or wide-plank hardwood flooring for comfort and durability
• Built-in storage solutions like spice pull-outs, appliance garages, and hidden trash drawers
• Walk-in pantry, prep kitchen, or built-in breakfast nook that adds both function and charm

How Much Is a Full or Primary Bathroom Addition in Salt Lake City?

If you’ve ever shared a bathroom with a full household, you already know—adding another one is a game changer.

In Salt Lake City, a full or primary bathroom addition usually runs between $60,000 and $100,000 and beyond, depending on what kind of space you’re adding and how dialed in you want it to be. A smaller full bath for guests or kids will fall toward the lower end, while a larger, more luxurious setup—like a primary suite—will push that number higher.

Things like plumbing, waterproofing, and ventilation are always part of the deal, but the home addition cost really depends on the size, layout, and all the features you want to include.

Lower End of the Range ($60K–$75K)

• Standard-sized full bathroom with a practical tub/shower combo that gets the job done for guests, kids, or day-to-day use
• Smart, efficient layout that keeps costs down by working with your existing plumbing setup
• Semi-custom vanity with clean lines, functional storage, and a durable quartz countertop that still feels polished
• Mid-range plumbing fixtures from trusted brands like Moen, Delta, or Kohler—reliable, attractive, and easy to maintain
• Porcelain tile or luxury vinyl plank flooring that’s water-resistant, tough, and still looks sharp
• Simple lighting and ventilation upgrades to keep the space feeling fresh, bright, and comfortable

Higher End of the Range ($80K–$100K+)

• Spacious layout designed as part of a primary suite—your own private retreat, just steps from the bedroom
• Walk-in shower with frameless glass or a freestanding soaking tub that gives serious spa energy
• Custom vanity with dual sinks and thoughtfully built-in storage that keeps everything right where you need it
• Designer fixtures, including a sleek rain showerhead and finishes that feel elevated but not over-the-top
• Radiant heated floors paired with premium tile for a look that’s beautiful and a feel that’s even better
• Layered lighting with sconces, backlit mirrors, and dimmers to set the mood for early mornings or late-night wind-downs

Need help deciding which type of bathroom addition fits your space and your goals? We’ll walk you through it.

How Much Does a Mudroom or Laundry Room Addition Cost in Salt Lake City?

These aren’t just nice-to-haves—they’re the kind of upgrades that make daily life feel a little less chaotic.

A well-designed mudroom or laundry room helps keep things organized, keeps the mess in one place, and just makes your home work better. In Salt Lake City, this type of home addition usually falls between $20,000 and $40,000, and possibly beyond this depending on the size, layout, and finishes you’re after.

Here's how that range typically breaks down with what's possible in that range:

Mudroom Additions

• Modest square footage with a simple, functional layout near an exterior entry
• Durable LVP or tile flooring that stands up to wet boots and muddy paws
• Built-in bench with cubbies or lockers for shoes, backpacks, and coats
• Semi-custom cabinetry or shelving for extra storage
• Wall hooks and charging stations to keep everything in its place
• Optional extras: shiplap, accent tile, or beadboard for added personality

Laundry Room Additions 

• Dedicated laundry space with enough room for folding, sorting, and storage
• Utility sink with basic plumbing tie-in for easy clean-ups
• Cabinetry and countertops for detergent, baskets, and laundry supplies
• Tile or LVP flooring that’s water-resistant and low-maintenance
• Overhead lighting and ventilation upgrades to keep things bright and fresh
• Optional upgrades: pull-out hampers, drying racks, or a built-in ironing station

It’s not usually the flashiest spaces in your home—but with the right designer and builder, these places of utility can be very stylish and even enjoyable!

How Much Does a Detached ADU Cost in Salt Lake City?

A detached ADU (Accessory Dwelling Unit) gives you real flexibility—whether it's for guests, family, or future rental income.

In Salt Lake City, building a fully detached ADU from the ground up typically runs between $300 and $350 per square foot or above. That number might sound high, but you’re essentially building a small home: foundation, framing, utilities, bathroom, kitchen, and all.

Here's how the details of what's possible:

Lower End of the Range ($300/sq ft)

• Smaller footprint with a smart, single-level layout that fits neatly on your lot while still feeling livable and comfortable
• Durable LVP flooring paired with solid surface countertops—easy to clean, easy to love, and built for everyday use
• Stock cabinetry and a simple tile backsplash that keep things streamlined without feeling bare-bones
• Full bathroom with a walk-in shower or tub/shower combo, and mid-range fixtures that balance style and function
• Mini-split HVAC system for year-round comfort and standard insulation to keep energy bills manageable

Higher End of the Range ($350+/sq ft)

• Larger footprint or even a two-story layout that gives you the flexibility for separate sleeping, living, and working spaces
• Custom cabinetry and designer finishes throughout, built to match the look and feel of your main home
• Quartz or natural stone countertops, a tiled walk-in shower, and premium flooring like engineered wood or high-end LVP
• Full kitchen with upgraded appliances, vent hoods, stylish fixtures, and plenty of storage
• Smart home features like integrated lighting and climate control, plus radiant heat and added soundproofing for year-round comfort and privacy

It’s a serious investment—but when done right, a detached ADU offers long-term value and opens up new possibilities for how you use your property.

How Much Does a 12x12 Room Addition Cost in Salt Lake City?

If you need just a bit more space, a 12x12 room addition is a great way to get another bedroom, a second living room, a playroom, and other spaces.

It’s one of the more approachable ways to expand, especially if you’re not adding plumbing. In Salt Lake City, you can expect to spend $50,000 to $60,000 and above, depending on the materials and finishes you choose. Here’s a closer look at what's possible:

Lower End of the Range

• Simple framing and clean roofline extension that ties in with your existing home without overcomplicating the structure
• LVP or carpet flooring that’s comfortable, durable, and suited to how you’ll use the space—guest room, office, or flex area
• Standard insulation and drywall for a finished look that blends right in with the rest of the house
• Basic electrical and lighting setup to give you just what you need (and leave room for upgrades later if you want them)
• One window and a standard door, sized right for the room and matched to your home’s existing style

Higher End of the Range and Above

• Architectural details that match your home’s original style, so the new space looks like it’s always been there
• Engineered hardwood or upgraded tile flooring that adds comfort and polish without sacrificing durability
• Larger or multiple windows to bring in natural light and make the room feel bigger and brighter
• Upgraded trim work, designer lighting, and custom paint finishes that tie everything together and elevate the overall feel
• French or pocket doors that create a stylish transition into adjacent spaces—great for offices, nurseries, or cozy retreats

Small as it may be this kind of room addition can give you the breathing room you need—without a full-scale remodel.

Looking for a Home Addition Contractor Who Actually Gets It?

A home addition is a big decision. Not just because of the cost, but because you're trusting someone to add to the home you already love. You want it to feel intentional, well-built, and completely natural—not like someone tacked on a box in the backyard.

The good news?

The right team will help you get there. Here’s how to find one that knows what they’re doing and respects your budget along the way.

Start with Real Feedback

Check out reviews and testimonials—not just star ratings, but the real stories. You're looking for patterns: homeowners who mention strong communication, clean job sites, projects finishing on time, and work that blends beautifully with their original home.

Not every remodeler is experienced in home additions Utah homeowners need—so focus on those who’ve done it (and done it well).

Choose a Contractor Who Knows How to Blend Old and New

Additions shouldn’t look or feel like an afterthought.

The roofline, siding, windows, trim, even the floorplan—it all needs to work together. A great contractor knows how to match the architecture and flow of your home, so the new space feels like it’s always been there.

Ask to see examples of past additions. If their work looks seamless, you’re in good hands.

Ask About Their Process

A good addition takes more than tools and talent—it takes a clear, organized plan. Ask them how they:

• Build and stick to a budget
• Handle permits and zoning (especially important across Salt Lake County and Summit County)
• Coordinate between design and construction teams

If you’re getting vague answers or big promises without substance? Keep looking.

Have a Real Conversation

That first consultation matters. Use it to get a feel for how they work—and how they listen. A solid contractor will bring helpful ideas to the table and walk you through the realities of adding to your house, not just tell you what you want to hear.

Bonus points if they’ve built additions similar to yours before.

Consider a Design-Build Team

The design-build delivery method is quickly becoming the popular choice. You get everything under one roof: designers, builders, project managers—all working together from day one.

That means fewer handoffs, better communication, and a home addition that stays on budget and on schedule.

You also get expert advice on how design choices impact construction costs—so there are no surprises down the line.

Find Your Perfect Design-Build Team

At Marshall Homes, we’ve helped countless homeowners expand their space without compromising the charm, flow, or feel of the home they already love. With expert craftsmanship, a collaborative design process, and clear communication from start to finish, we make sure your home addition stays on track, on time, and within budget—just the way it should be.

Thinking about adding on to your house? We’d love to hear what you’re envisioning and talk through what’s possible for your home.

Let’s build something that fits your life.