Our Services

Kitchen Remodeling
Transform your kitchen into the heart of your home. From cabinet refacing to complete gut renovations, we handle layout changes, custom cabinetry, countertop installation, backsplash, lighting, and appliance upgrades. Whether you're updating a galley kitchen or creating an open-concept dream kitchen, 4Sigma delivers quality craftsmanship on time and on budget.

Bathroom Renovation
Upgrade your bathrooms with modern fixtures, custom tile work, walk-in showers, soaking tubs, double vanities, and more. We handle everything from a simple refresh to a full reconfiguration including plumbing and electrical.

ADU Construction (Accessory Dwelling Units)
Add a rental unit, in-law suite, or home office to your property. We manage the full process — design, permits, construction, and finishing — helping Bay Area homeowners maximize their property value.

Room Additions
Need more space? We build seamless room additions that blend perfectly with your existing home. Bedrooms, family rooms, sunrooms, and more.

Whole Home Renovation
Complete home transformations from top to bottom. Ideal for homeowners, investors, and those looking to renovate before selling.

Structural Changes
Load-bearing wall removal, foundation work, and structural modifications. Our licensed team handles complex structural projects safely and to code.

Window & Door Replacement
Upgrade your home's energy efficiency, security, and curb appeal with new windows and doors. We install all styles and materials.

Flooring
Hardwood, laminate, and luxury vinyl plank (LVP) installation. We help you choose the right flooring for your lifestyle and budget.

📞 Call 925-236-0225 for a free estimate | License #1134839