Your Portola Valley ADU,
Designed & Built Right.
Bay Area homeowners trust Mayer’s Construction for ADU construction in Portola Valley — with our in-house design team, full permit handling, and licensed build crew all under one roof. CA License #1063024.
More Than an ADU. A Smart Bay Area Investment.
Portola Valley Portola Valley ADU construction includes in-house design, permit handling, and licensed build — everything managed under one roof from first sketch to final inspection.
Portola Valley Specialist
ADU
Complete ADU in Portola Valley — from layout planning and design to custom cabinetry, countertops, and appliance installation. In-house team. Zero outsourcing.
Bathroom Remodel
Full bathroom renovations — shower, tub, tile, vanity, and fixtures. Our in-house design team creates cohesive spaces that match your kitchen and home aesthetic.
Room Addition / ADU
Expand your Portola Valley home with a licensed room addition or accessory dwelling unit. Structural planning, permits, and build — all handled by our licensed crew.
Construction & Remodeling
General contracting for Portola Valley homeowners — structural changes, whole-home remodels, and complex renovation projects managed start to finish.
Garage Conversion
Convert your garage into livable space — home office, guest suite, or rental unit. Permitted, designed, and built by our in-house team from day one.
Design & Build
One team. One contract. Zero coordination gaps. Our in-house designer and licensed builders take you from concept to completion without third-party delays.
Projects That Speak
For Themselves
Every Portola Valley ADU gets our in-house designer, dedicated project manager, and licensed crew — from first sketch to final walkthrough.
Simple. Transparent. Done Right.
Three steps from your first call to your final walkthrough — no surprises, no outsourcing, no stress.
Free In-Home Estimate
We visit your Portola Valley property, assess your ADU options and site constraints, and give you an honest estimate. No commitment. Just a real conversation about what’s possible.
Design & Material Selection
Our in-house design team works with you on layout, cabinetry, countertops, and fixtures. We source everything — so you don’t coordinate with multiple vendors.
Build & Final Walkthrough
Our licensed Portola Valley crew handles permits, construction, and daily cleanup. Your project manager keeps you updated every single day.
No pitch.
Just an honest
estimate.
We come to your home, understand your vision, and give you a real number. No vague estimates, no pressure — ever.
- ★★★★★ 5 Stars on Google
- In-house crew — no subcontractors, ever
- 500+ Bay Area families · Since 2009
- CA License #1063024
Convert Your Portola Valley Garage Into a Fully Permitted ADU
Many Portola Valley homeowners have an attached or detached garage that can become a fully permitted accessory dwelling unit — guest quarters, rental income, or a home for extended family. Garage conversion is one of the most cost-effective ADU types because the foundation and structure already exist. Mayer’s Construction handles the full conversion — design, permits, and build — as one integrated project with one point of contact.
Full-Service Conversion
Insulation, HVAC, plumbing, electrical, kitchen, and bath — every trade is our own in-house crew. No subcontractor coordination required from you.
Permit Handling Included
State ADU law requires Portola Valley to allow garage conversions. We file all permits, manage plan check, and coordinate inspections through to certificate of occupancy.
In-House Design Included
Our designer optimizes your garage layout for livable, functional space — with material sourcing assistance for finishes, fixtures, and cabinetry.
The Contractor Portola Valley Homeowners Actually Recommend
Portola Valley homeowners choose Mayer’s because we bring our in-house designer and licensed crew to every project — with zero outsourcing and daily updates from start to finish.
In-House Design Team
Our designer works with you on every layout, cabinet, countertop, and finish. No third-party designers, no coordination delays.
We Source Your Materials
From countertop slabs to cabinet hardware — we handle sourcing so you don’t chase vendors.
Portola Valley ADU Permit Process
Portola Valley ADU permits go through the Town of Portola Valley Building Division. State ADU law applies and the Town processes applications in compliance. We handle full permit management — submittal, plan check, and all inspections — so you never need to navigate the Town offices directly.
Daily Progress Updates
Your dedicated project manager texts and calls you every day. No surprises. No wondering what’s happening.
Family-Owned Accountability
Nathan and the Mayers team are personally invested in every Portola Valley project. This is our reputation — and we protect it.
Real Portola Valley Homeowners. Real Results.
Every review below is from a verified Google client.
“Nathan and his team handled our complete remodel from start to finish. Daily updates, zero surprises. Their designer Natalee made our vision real. Best decision we made as Portola Valley homeowners.”
“Our outdated kitchen was completely transformed into a modern, functional space I absolutely love. The in-house design team helped us source exactly the materials we had in mind — and the result is better than anything I could have imagined.”
“Mayer’s CNR exceeded every expectation. Quality and attention to detail on every single aspect of our remodel. I have referred them to three neighbors already.”
Rated 5.0 on Google & Houzz
Portola Valley ADU Questions
Honest answers about timeline, permits, licensing, and how we work.
Serving Portola Valley & the Bay Area
Licensed ADU contractor covering the entire Bay Area Peninsula and South Bay.
Your Portola Valley ADU
Starts with One Call
Schedule your complimentary ADU consultation. We visit your Portola Valley property, assess your ADU options, and give you an honest estimate — no pressure, no obligation.
Get Your Free Portola Valley ADU Estimate
We’ll schedule your complimentary in-home visit within days. No pressure. No obligation.
SKIP THE WAIT
Book Your Free Consultation — Right Now
Pick a time that works for you. We’ll call you, walk through your project, and give you an honest plan — no pressure, no obligation.
Prefer to call? Reach us at (888) 394-4041