Greater Sacramento Region's Home Addition Builder

Room to Grow,
Without the Move.

Add the square footage your family needs — a new bedroom, a bigger kitchen, a second story, or a sunlit great room — without the cost and upheaval of moving. Altec designs and builds seamless home additions across the greater Sacramento region — Roseville, Rocklin, Folsom, El Dorado Hills, Granite Bay, and beyond — since 1994. CA License #740844.

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30+ Years Experience
$60K+ Starting Investment
5★ Rated Contractor
CA License #740844
Design-Build Firm
Est. 1994 — Roseville, CA
Acorn Finance Available
No-Surprise Pricing
Seamless home addition with great room, vaulted ceiling and large windows matched to the existing house in Roseville CA
What We Deliver

More Than Square Footage.
A Seamless Extension.

A great addition doesn't look added on — it looks like it was always part of the house. Altec matches your existing rooflines, siding, windows, and interior finishes so new space blends in perfectly, inside and out. From a single-room bump-out to a full second story, we bring 30 years of Sacramento-area structural and finish expertise to every project.

  • Room and bump-out additions
  • Second-story additions
  • Primary suite and bedroom additions
  • Great room and family room expansions
  • Kitchen and dining expansions
  • Sunrooms and enclosed patios
  • Foundation, framing, roofline, and permits handled
Scope of Work

The Space You Need,
Built to Match.

Every addition is scoped to your home and your goals. We don't upsell — we right-size.

Room Additions

Bedrooms, home offices, bonus rooms, and playrooms. New foundation, framing, and roof tie-in — matched to your home so the addition reads as original construction.

Second-Story Additions

Add an entire level and double your footprint without giving up yard. Includes structural reinforcement, new stairs, and full integration with the floor below.

Primary Suite Additions

A private retreat: spacious bedroom, spa bathroom, and walk-in closet. One of the highest-value additions you can make — and a daily upgrade to how you live.

Great Room Expansions

Open up and extend your living and family space with vaulted ceilings, large windows, and indoor-outdoor flow. The gathering space your home has been missing.

Kitchen & Dining Expansions

Push out exterior walls to enlarge a cramped kitchen or add a true dining area. Full structural, electrical, plumbing, and finish work in one coordinated build.

Sunrooms & Enclosures

Sunrooms, enclosed patios, and three-season rooms that flood your home with light and add usable square footage you'll enjoy nearly year-round.

Home Addition Cost — Greater Sacramento Region

What Does a Home
Addition Cost?

Addition costs depend on size, complexity, and finish level — a single-room bump-out is a very different project than a full second story. Here's an honest breakdown of what Altec clients typically invest at each level.

Typical Investment Range
$60,000 – $400,000+

Single-room addition to a full second story.

Finance your home addition through Acorn Finance. Pre-qualify in minutes with no credit score impact. Flexible monthly options for qualified homeowners.

Investment Tiers
  • Room / Bump-Out Addition $60K – $150K Single Room
  • Primary Suite Addition $120K – $250K Bedroom + Bath + Closet
  • Second-Story Addition $200K – $400K+ Full Level
  • Typical ROI at Resale 50–65% Plus Added Sq Ft

Every addition is different. Request a free in-home estimate and we'll scope your project and give you an exact number.

Our Home Addition Process

How We Build Your
New Space

A proven process built over 30 years. You'll always know exactly where your project stands.

Free In-Home Estimate

We visit your home, assess the space and structure, listen to your goals, and discuss your budget. No obligation.

Design & Engineering

We create architectural plans and structural engineering, then help you select finishes that match your existing home.

Permitting

We handle building permits, structural review, and HOA approvals where required. No headaches for you.

Construction

Foundation, framing, roof tie-in, weatherproofing, and finishes. We keep your home sealed and livable throughout.

Final Walkthrough

We review every detail together and make sure your new space looks like it was always part of the home.

Why Altec Construction

Additions Done Right.
Since 1994.

We've been expanding Sacramento-area homes for three decades. Here's what sets us apart.

One Team, Start to Finish

Design, engineering, foundation, framing, roofing, electrical, plumbing, and finish work — all under one roof. No handoffs between contractors. No gaps in accountability.

Fixed-Price Contracts

Your quote is your price. We define the full scope before we start and hold to it. No mid-project change orders that inflate your final bill.

Licensed & Insured

Every trade on your project is fully licensed and insured. CA Lic #740844. Your home and investment are protected throughout the build.

Sacramento-Region Experts

We know every city across the Sacramento region — Roseville, Rocklin, Folsom, Elk Grove, Granite Bay, El Dorado Hills, and more — the permit offices, the local suppliers, the neighborhoods. That local knowledge saves you time and money.

Built to Match

The mark of a great addition is that you can't tell it's an addition. We match rooflines, siding, windows, and trim so new space looks original — not bolted on.

Flexible Financing

Through Acorn Finance, you can pre-qualify fast with no credit impact. We'll help you find the right plan so the space you need doesn't have to wait.

Common Questions

Home Addition FAQs

Additions are larger than typical remodels. A single-room addition usually takes 2–4 months. A primary suite addition runs 3–5 months. A full second story is typically 4–8 months. Design, engineering, and permitting happen before construction begins. We give you a firm timeline in your estimate and stick to it.
Yes — that's the whole point. We match your rooflines, siding, window styles, exterior trim, and interior finishes so the new space looks original both inside and out. A well-built addition should be invisible as an addition; that seamless match is one of the things Altec is known for.
Always. Any addition that expands your home's footprint or adds a level requires building permits and stamped structural engineering, and many neighborhoods also require HOA approval. Altec handles the full package — architectural plans, engineering, permit applications, inspections, and HOA submittals — so you don't have to chase any of it.
In most cases, yes. Because additions are built onto the exterior first, your existing home stays sealed and livable through most of the project. The new space is only opened up to the house near the end, and we plan that connection to keep disruption to a minimum. For second-story work we'll walk you through what to expect during the key phases.
For many families, yes. You keep your location, schools, neighbors, and (often) a lower property-tax basis, and you avoid agent commissions, closing costs, and the stress of moving. Best of all, you get exactly the space you want, built to your taste — rather than compromising on someone else's floor plan.