Serving: San Francisco and San Mateo Counties

Home Additions & ADUs • Licensed & Insured (Lic #978277)

Home Additions & ADU Construction in San Mateo, Daly City & San Francisco

Need more space without moving? RP Construction specializes in home additions, room additions, and ADU construction for homeowners in San Mateo, Daly City, San Francisco, Redwood City, Palo Alto, Mountain View, and surrounding Peninsula & South Bay cities. From planning and permits to framing and finishes, we deliver high-quality work with clear communication and a detail-driven process.

  • Room Additions & ExpansionsBedroom additions, guest suites, family rooms, second-story additions, and more—built to match your home.
  • ADUs & In-Law UnitsDetached ADUs, garage conversions, and backyard units designed for rental income or multi-generational living.
  • Permits, Structural, Plumbing & ElectricalWe coordinate trades and ensure work is code-compliant from foundation to finish.
Call (650) 663-3232 Request a Free Estimate
Home Additions & ADUs San Mateo • Daly City • SF • Peninsula

Expand Your Home with a Smart, Code-Compliant Addition

A well-built home addition gives you the space you need while increasing long-term property value. RP Construction provides full-service addition construction—from initial planning and layout to structural framing, roofing, siding, drywall, and interior finishes—so the new space looks and feels like it was always part of your home.

Considering an ADU in San Mateo or a garage conversion in Daly City? Want a room addition in San Francisco or extra living space in Redwood City, Palo Alto, or Mountain View? We help guide the process with clear scope, realistic timelines, and quality workmanship—while coordinating permits and ensuring the project meets local building codes.

Whether you’re building for family, comfort, or rental income, our team keeps the process organized and professional—protecting your home, communicating consistently, and delivering results you’ll feel good about.

San Mateo
Daly City
San Francisco
Redwood City
Palo Alto
Mountain View
Surrounding Peninsula & South Bay
Our Home Addition Process

Steps We Take for a Successful Home Addition Project

1
Initial Consultation & Free Estimate We meet with you to discuss your goals, space requirements, budget, and timeline. After reviewing the property, we provide a clear and detailed proposal for your home addition project.
2
Planning & Design Our team works with you to finalize layouts, room size, structural requirements, and materials. This phase ensures your addition integrates seamlessly with the existing home.
3
Permits & Engineering We coordinate required permits and ensure structural plans meet local building codes in San Mateo County, San Francisco, and surrounding cities before construction begins.
4
Site Preparation & Foundation Work The construction phase begins with site preparation, excavation if needed, and foundation work to properly support the new addition.
5
Framing & Structural Construction We build the structural frame of the addition including walls, roof structure, and exterior envelope so the new space integrates with your existing home.
6
Mechanical, Electrical & Plumbing Licensed professionals install plumbing, electrical wiring, insulation, and HVAC connections required for the new living space.
7
Interior Finishes Drywall, flooring, cabinetry, trim, lighting, paint, and other finishing details are installed to complete the new living area.
8
Final Inspection & Walkthrough We complete inspections, perform a final walkthrough with you, and ensure everything meets quality standards before delivering your finished home addition.