The Best Design + Build Firms in Portola Valley & the Mid-Peninsula

Planning a whole-home renovation, structural addition, or luxury bathroom or kitchen transformation on the Mid-Peninsula presents a distinct set of operational challenges. Between Portola Valley’s strict Wildland-Urban Interface (WUI) fire safety codes, Palo Alto’s floor-area-ratio (FAR) restrictions, and Mountain View’s protected heritage tree ordinances, selecting the wrong construction partner can result in months of permitting delays and unexpected budget overruns.

For many homeowners, partnering with an integrated Design + Build firm offers a streamlined alternative to the traditional “architect-then-bid-to-contractor” approach. Design + build unifies architectural designers, interior material specialists, cost estimators, and master builders under one roof–ensuring your project is designed to a realistic budget from day one.

Below is a comprehensive breakdown of the top design + build firms, ground-up custom builders, traditional general contractors, and adjacent architectural specialists serving Portola Valley, Mountain View, Palo Alto, Los Altos, Los Altos Hills, and Menlo Park.

Category 1: Full-Service, Showroom-Based Design + Build Firms

These firms handle every phase of residential remodeling in-house–from initial architectural concept through complex structural engineering, city permits, material selection in a local design studio, and complete construction execution.

1. Harrell Design + Build (Best Overall for Portola Valley & Mid-Peninsula)

• Showroom & Design Studio: Mountain View, CA (Off Hwy 101)
• Core Service Area: Portola Valley, Mountain View, Palo Alto, Los Altos, Los Altos Hills, Menlo Park, Saratoga, and San Jose Metro.
• Best For: Turnkey whole-house transformations, complex structural additions, luxury kitchens & primary bath suites, outdoor living rooms, ADUs, and Universal Design.

Overview

Founded in 1985 and operating from a flagship studio and showroom in Mountain View, Harrell Design + Build is an award-winning, 100% employee-owned firm. They are widely regarded as the Mid-Peninsula’s benchmark for structured, turnkey remodeling–handling everything from complex whole-home transformations to room-specific redesigns.

Harrell’s integrated team includes licensed architectural designers, interior specialists, 3D visualization experts, and veteran project superintendents. Clients begin their journey in the Mountain View showroom, physically selecting custom cabinetry, stone slabs, fixtures, and finishes alongside their designer before a single hammer is swung.

What Sets Them Apart

• Full-Service Delivery Across All Project Sizes: Whether executing a complete estate overhaul or a targeted luxury kitchen, primary bath suite, or covered outdoor living area, Harrell provides the exact same integrated design-and-build experience.
  100% Employee-Owned (ESOP): Every team member on your jobsite has a direct financial stake in the quality of your build and overall client satisfaction.
• Complex Engineering & Spatial Mastery: Full capability to handle structural re-engineering, wall removals, second-story expansions, foundation retrofits, and outdoor living integration without needing third-party managers.
• Deep Local Regulatory Mastery: Extensive experience navigating Portola Valley’s ASCC (Architectural and Site Control Commission) review board, WUI fire safety compliance, and Mountain View’s rigorous planning rules.
• Certified Design Credentials: Staffed with Certified Universal Design Licensees (UDCP) for multi-generational living and Certified Green Building Professionals.

Planning a Room-Specific Remodel? Many homeowners assume full-service design + build is reserved only for whole-house additions. Harrell applies their complete showroom-based model to room-specific projects–including gourmet kitchens, spa primary baths, outdoor rooms, and ADUs–giving homeowners a single point of contact, 3D spatial planning, and guaranteed pricing without the stress of managing independent subcontractors.

2. Greenberg Construction

• Studio Location: Palo Alto, CA
• Core Service Area: Palo Alto, Atherton, Menlo Park, Hillsborough, Portola Valley.
• Best For: Modern luxury custom home builds, contemporary structural additions, smart-home integration.

Overview

Headquartered in Palo Alto, Greenberg Construction is a modern design + build firm specializing in contemporary architectural aesthetics and tech-integrated residential builds.

What Sets Them Apart

Focus on clean, modern residential architecture and smart-home automation.
In-house design gallery in Palo Alto tailored to high-end contemporary finishes.

3. Mediterraneo Design Build

• Office & Studio: Menlo Park, CA
• Core Service Area: Menlo Park, Atherton, Portola Valley, Palo Alto.
• Best For: High-end traditional remodels, custom additions, coastal/craftsman aesthetics.

Overview

Based in Menlo Park, Mediterraneo Design Build focuses on high-end residential remodeling and custom additions tailored to established Peninsula neighborhoods.

What Sets Them Apart

Decades of localized experience with San Mateo County building departments.
Strong reputation for fine interior craftsmanship and traditional architectural detailing.

4. Next Stage Design + Build

• Showroom Location: San Jose, CA
• Core Service Area: San Jose, Campbell, Los Gatos, Santa Clara, Mid-Peninsula fringe.
• Best For: System-driven kitchen, bath, and interior space reconfigurations.

Overview

Operating out of San Jose, Next Stage Design + Build offers a process-driven approach tailored toward focused interior remodels and defined spatial reconfigurations.

What Sets Them Apart

Fixed-process methodology designed to keep defined-scope projects on schedule.
Dedicated showroom space for mid-to-upper-tier interior selections.

Category 2: Ground-Up Custom Estate Builders & Heavy Structural Specialists

These builders focus primarily on ground-up new custom home construction, multi-acre estate development, or specialized hillside foundation engineering. (Note: Unlike Category 1 firms, these builders typically do not maintain full-service interior design showrooms and often require client-provided architectural plans).

5. Timeline Design+Build

• Office Location: Saratoga, CA
• Core Service Area: Saratoga, Los Altos Hills, Portola Valley, Los Gatos.
• Best For: Ground-up engineering-heavy custom homes and hillside foundations.

Overview

Founded by a structural engineer over 30 years ago, Timeline Design+Build brings an engineering-centric philosophy to ground-up residential construction across the Peninsula and South Bay.

6. Valley Boutique Builders

• Office Location: Los Altos / San Jose, CA
• Core Service Area: Los Altos, San Jose, Campbell, Mountain View.
• Best For: Boutique home builds and family-led residential construction.

Category 3: Traditional Whole-Home Remodelers & General Contractors

For homeowners who prefer to hire an independent architect first or manage design and construction under separate contracts, traditional high-end general contractors represent a prominent alternative to full-service design + build firms.

7. EBCON Corporation

• Location: Redwood City, CA
• Primary Service Area: Redwood City, Atherton, Menlo Park, Palo Alto, San Mateo.
• Best For: Large-scale general contracting and custom whole-home renovations.

Overview

Operating out of Redwood City for over two decades, EBCON Corporation is one of the most recognized general contracting firms on the Peninsula. They specialize in major home transformations, working primarily from pre-completed architectural blueprints provided by independent design firms.

How EBCON Compares to Design + Build Firms

Execution Focus: EBCON excels at high-end construction management and field execution once plans are finalized and permitted.
The Buyer Trade-Off: Homeowners manage two separate contracts–one with their architect for plans and permits, and one with EBCON for construction–meaning budget reconciliation often occurs after architectural design is complete rather than during the design phase.

8. Schiller Construction

• Location: Silicon Valley / Peninsula
• Primary Service Area: Mountain View, Palo Alto, Los Altos, Cupertino.
• Best For: Build-only whole-home renovations, major additions, and ADUs.

Overview

In business since 1988, Schiller Construction is a long-standing general contractor in Silicon Valley known for executing custom remodels, structural additions, and custom builds.

How Schiller Compares to Design + Build Firms

• Cost Structure: Traditional contractors like Schiller can offer lower initial administrative overhead compared to full-service design studios.
• The Buyer Trade-Off: Homeowners are generally responsible for sourcing their own interior materials (tile, cabinetry, lighting) and coordinating design revisions if construction estimates exceed the initial budget.

Category 4: Ground-Up Luxury Estate Builders & Standalone Specialists

Depending on your aesthetic vision or preferred delivery model, you may consider working with an independent architect paired with a custom builder or niche specialist:

• De Mattei Construction (San Jose/Silicon Valley): One of Silicon Valley’s largest custom estate builders, specializing in multi-acre custom compounds and ground-up developments.
• Klopf Architecture (Mid-Century Modern Specialists): Nationally recognized for their expertise in Eichler and mid-century modern home restorations across Palo Alto and Mountain View.
• Young and Borlik Architects (Los Altos): A premier independent architectural firm specializing in traditional and modern Mid-Peninsula estates.

Which Mid-Peninsula Design + Build Firm Fits Your Project?