Second Story Additions
Double your living space without expanding your footprint. We build full second stories with structural engineering, custom staircases, and seamless roofline integration.
Double Your Living Space, Keep Your Lot
When you love your neighborhood but your family has outgrown your floor plan, a second story addition is the answer. Instead of expanding outward and losing yard space — or uprooting your family to a bigger house — you build up. At Keystone Building Services, we specialize in adding full second stories to Sacramento homes, turning single-story ranches into two-story family homes with the bedrooms, bathrooms, and living space you actually need.
A second story addition is one of the most complex residential construction projects there is. Your existing home was not designed to carry a second floor, which means the project starts with a licensed structural engineer evaluating your foundation, framing, and load paths. From there, we reinforce the existing structure, build the new second floor, redesign the roofline, and construct the staircase that connects everything. Every trade is involved: structural, framing, roofing, electrical, plumbing, HVAC, drywall, flooring, and finish carpentry.
Second story additions in Sacramento typically cost $350 to $500+ per square foot, depending on the structural complexity, the extent of foundation reinforcement required, and the finishes you select. A 600 square foot second story — two bedrooms and a bathroom — would range from $210,000 to $300,000 or more, fully permitted and finished. The higher cost compared to a standard room addition reflects the structural engineering, foundation work, and roofline redesign that a second story demands.
Engineering, Staircases, and Roofline Integration
Structural Engineering
A licensed structural engineer evaluates your existing foundation and framing before we break ground. We determine exactly what reinforcement is needed — new footings, steel beams, upgraded load paths — so your home safely supports the new second floor for decades to come.
Staircase Design
The staircase is both functional and architectural. We design and build custom staircases — straight, L-shaped, or U-shaped — with options for iron balusters, hardwood treads, and detailed trim work. The staircase should feel like an original feature, not an afterthought.
Roofline Integration
The biggest visual challenge of a second story addition is the roofline. We redesign it so the home looks like it was always two stories. Matching pitch, materials, fascia, and trim so the addition blends seamlessly with the original structure from every angle.
From Engineering to Move-In
A second story addition requires careful planning, structural analysis, and phased construction. We manage every step so you have a single point of contact from engineering assessment through final inspection.
Engineering Assessment
A licensed structural engineer evaluates your existing foundation and framing to determine what reinforcement is needed to support an entire second floor.
Design & Permits
We coordinate architectural plans, structural drawings, and all permit applications with the City of Sacramento. You get a complete scope of work before we break ground.
Structural Reinforcement
Foundation strengthening, beam installation, and first-floor framing upgrades to safely carry the load of the new second story.
Framing & Roofing
Second floor framing goes up, the new roofline is built, and the structure is made weathertight. This is where your home transforms.
MEP & Interior
Electrical, plumbing, and HVAC are extended to the second floor. Staircase construction, drywall, flooring, trim, and paint complete the interior.
Final Inspection
Every phase passes city inspection. Final walkthrough with you, punch list completed, and your new second story is ready to move in.
Full-Scope Second Story Services
Why Choose Keystone for Your Second Story
Second story additions are not a project you hand off to the lowest bidder. The structural complexity alone demands a contractor who understands load paths, foundation reinforcement, and building code requirements inside and out. Gerardo Diaz is a licensed electrician with over 11 years of construction experience, which means the electrical system in your new second floor is designed and installed by an expert — not subcontracted out to the cheapest available electrician.
With Keystone Building Services, every trade is managed under one roof. Structural reinforcement, framing, roofing, staircase construction, electrical, plumbing, HVAC, drywall, flooring, trim, and paint — all coordinated by Gerardo Diaz and his crew. No subcontractor finger-pointing, no scheduling gaps between trades, and no surprises. When problems come up — and on a project this complex, they do — we communicate immediately and present your options before proceeding.
Every second story addition we build is fully permitted and built to California building code. We handle all permit applications, structural engineering coordination, plan submissions, and required inspections. Your project is backed by California contractor license #1095766, a $15,000 bond, full insurance, and a BuildZoom score of 98/100.
Second Story Addition FAQs
Ready to Add a Second Story?
Get a free, no-obligation estimate for your Sacramento second story addition. Call us today or fill out our quick online form.