ADU & Home Addition in San Mateo

Add more space and functionality to your San Mateo property with thoughtfully planned ADU and home addition solutions.

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Licensed & insured

Bay Area Specialists

ADU & Home Addition project in San Mateo by Alpine Haus Construction

ADU & Home Addition service completed in San Mateo by Alpine Haus Construction

Recent ADU & Home Addition work by Alpine Haus Construction in San Mateo

Who we are

ADU & Home Addition Contractor in San Mateo, CA

Alpine Haus Construction specializes in ADU and home addition projects, coordinating every stage from initial planning and permit approval to construction and final inspection. Our team handles structural expansion, layout integration, and utility connections while ensuring compliance with local building standards. We deliver flexible living spaces designed for comfort, efficiency, and future residential use. Our team serves homeowners throughout San Mateo, California, delivering projects that meet local building requirements and property standards.

Learn more about our ADU & Home Addition services

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ADU & Home Addition Services in San Mateo

Detached ADU Construction

We build detached accessory dwelling units as fully independent living spaces designed for privacy, flexibility, and long-term use. Each project includes separate foundations, utility connections, and layouts optimized for rental or extended family living.

Services include:

Backyard cottage construction
Independent utility connections
Private entrance layouts
Rental-ready unit delivery

Attached ADU Development

We convert existing interior spaces into junior ADUs designed for compact, efficient living. Each project meets code requirements for access, light, and ventilation while upgrading systems for safe and functional use.

Services include:

Interior space conversions
Kitchen and utility installations
Plumbing and electrical upgrades
Code-compliant access and layout planning

Junior ADU and Conversions

Services include:

Interior space conversions
Kitchen and utility installations
Plumbing and electrical upgrades
Code-compliant access and layout planning

Prefab and Modular ADUs

We install prefab and modular ADUs using pre-engineered systems that reduce build time and site disruption. These units are designed for efficiency, durability, and modern residential use.

Services include:

Factory-built ADU installation
Accelerated construction timelines
Energy-efficient material selection
Turnkey delivery solutions

Two Story Additions

We construct second-story additions that increase living space while maintaining structural stability and architectural consistency. Our team manages load-bearing upgrades, access design, and full structural integration.

Services include:

Second-story construction
Load-bearing modifications
Staircase installation
Master suite expansions

Single Story Additions

We build single-story additions that expand functional living areas with seamless integration into existing structures. Projects are designed to improve space, flow, and everyday usability.

Services include:

Bedroom and bathroom additions
Kitchen extensions
Family room expansions
Foundation and exterior integration

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Recent ADU & Home Addition Projects in San Mateo

Trusted by Bay Area homeowners

Explore all our Work

Justin was friendly and easy to work with. He kept schedule and delivered a high quality build. He helped to build an ADU and the results were exceeded my expectations. The addition provides extra space and looks wonderful.

Hyun

ADU & Home Addition client

verified reviewS

Recent ADU & Home Addition project by Alpine Haus Construction in San Mateo, CA

Home improvement project by Alpine Haus Construction in San Mateo, CA

ADU & Home Addition work completed by Alpine Haus Construction in San Mateo, CA

Custom renovation project in San Mateo, CA

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Why San Mateo Homeowners Choose Alpine Haus Construction

Expert Quality & Expertise You Can Trust

5.0

rated from

Licensed Contractor

CA License #1125348

Fully Insured

Customer Protection

BBB A+ Rating

Quality Workmanship

5 Stars Reviews

Industry Expertise

10+

Years of Experience

100%

Customer Satisfaction

200+

Projects Completed

Our ADU & Home Addition Process

Alpine Haus Construction follows a six-phase workflow process.

Consultation

Initial consultation with property assessment and preliminary budgeting

Design & Planning

Design development with 3D renderings and architectural plans

Permits

Permit acquisition and regulatory approval coordination

Construction

Active construction with daily oversight

Inspection

Final inspection and documented quality checklist

Warranty

Post-completion warranty and follow-up support

Our Service Area

Remodeling in San Mateo & Surrounding Areas

We proudly serve homeowners across San Mateo and nearby South Bay communities, delivering high-end remodeling tailored to local architecture and building codes.

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Frequently Asked Questions

What you need to know about ADU & Home Addition in San Mateo, if you still want to know more, contact us!

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Begin by scheduling a consultation so we can review your goals, inspect the home, discuss scope, and outline the required steps for planning, design, permitting, and construction.

Project timelines range from a few weeks for small remodels to several months for large-scale renovations, depending on scope and permits.

Most structural, electrical, plumbing, and addition projects require permits in San Mateo. We manage applications, inspections, and approvals.

We perform daily job-site cleanup and complete a final thorough cleaning before project handoff.

ADU & Home Addition in San Mateo

ADU & Home Addition Contractor in San Mateo, CA