If you’re searching for a reliable ADU contractor in Mountain View, W & W Builders Group provides full-service ADU design and construction tailored to Mountain View zoning regulations, permitting requirements, and inspection standards. From early feasibility analysis through final city approval, we manage every phase of the ADU process to keep your project compliant, efficient, and well-organized.
Whether you’re planning a rental unit, guest house, or additional living space for family, our team delivers professionally built ADUs designed for long-term value in Mountain View.
Learn more about our full ADU design and construction services.
Mountain View homeowners can choose from several ADU options depending on lot size, property layout, and project goals.
A detached ADU is a standalone structure built separately from the main home, often located in the backyard. This option provides maximum privacy and flexibility and is commonly used for rental income or independent living space.
An attached ADU is connected to the existing residence and typically constructed as a home addition. This option works well when homeowners want to expand living space while maintaining architectural consistency with the main home.
A conversion ADU transforms an existing garage or interior space into a fully functional living unit. Conversion ADUs are often the fastest and most cost-effective option because they utilize existing structures and utilities.
Homeowners planning an ADU often explore additional upgrades such as kitchen remodeling in Mountain View, bathroom remodeling, full home remodeling, or home additions to improve comfort and long-term value.
As an experienced ADU contractor in Mountain View, we follow a structured, step-by-step process designed to keep your ADU project organized, predictable, and fully compliant with local zoning and building requirements. From the initial consultation through final city approval, our team manages every phase to ensure a smooth and stress-free construction experience.
We begin with a detailed consultation and on-site evaluation to review Mountain View zoning requirements, setbacks, lot conditions, access points, and existing site constraints. During this step, we also discuss your goals, budget, and intended use for the ADU to confirm feasibility and determine the most efficient approach.
You receive a comprehensive proposal outlining the full scope of work, estimated construction timeline, and budget expectations. This step establishes clear expectations, transparent pricing, and a well-defined plan before moving into design and permitting.
Our architectural and engineering team develops custom ADU plans tailored to your property while fully complying with Mountain View building codes, zoning regulations, and energy requirements. Each design focuses on efficient layouts, functionality, and long-term usability to maximize comfort and value.
We manage the entire permitting process, including plan submissions, revisions, and coordination with the City of Mountain View. Our experience with local approval procedures helps minimize delays and ensures all requirements are met efficiently.
We guide you through selecting finishes, fixtures, and materials that align with your design preferences, durability needs, and overall budget. From cabinetry and flooring to appliances and exterior details, we help streamline decisions so the project stays on schedule.
Once permits are approved, construction begins. Our dedicated project managers oversee subcontractors, inspections, scheduling, and quality control to maintain momentum and ensure professional standards throughout the build.
After construction is complete, we conduct a detailed walkthrough with you and coordinate all final inspections. This step ensures every detail meets expectations and complies with Mountain View regulations before final sign-off.
Your ADU is complete, fully approved, and move-in ready. Whether used as a rental unit, guest house, or additional living space, your new ADU is built for comfort, functionality, and long-term value.
Building an ADU in Mountain View requires local expertise, careful planning, and precise execution. City-specific zoning rules, setbacks, utility standards, and inspection procedures make experience with local approvals essential.
As a local ADU contractor, we offer a streamlined design-build approach that reduces delays, improves coordination, and keeps your project moving forward smoothly.
Proven experience with Mountain View ADU regulations and approvals
Integrated design-build services under one roof
Full permit and inspection coordination with the City of Mountain View
Clear scopes of work and transparent pricing
Dedicated project management from start to finish
High-quality craftsmanship built for durability and long-term performance
The timeline for building an ADU in Mountain View typically ranges from 6 to 11 months, depending on the type of ADU, design complexity, city review schedules, and construction scope. Each phase of the process plays a role in the overall timeline.
Most ADU projects follow these general stages:
Planning and design: 6–10 weeks
Permitting and city approvals: 8–16 weeks
Construction: 3–7 months
Working with a local ADU contractor like W & W Builders Group helps keep the timeline predictable by managing permits, coordinating inspections, and overseeing construction efficiently from start to finish.
The cost of building an ADU in Mountain View depends on several factors, including the size of the unit, the type of ADU, site conditions, utility connections, and finish selections. Because each property is unique, costs can vary widely based on project scope.
In general:
Garage conversion ADUs are usually more cost-effective since they use existing structures and utilities.
Attached ADUs tend to fall in the mid-range due to structural integration with the main home.
Detached ADUs are often the highest in cost because they require new foundations, framing, roofing, and full utility connections.
Partnering with an experienced ADU contractor in Mountain View such as W & W Builders Group helps establish a realistic budget early, define a clear scope of work, and reduce the risk of unexpected costs during construction.
Yes. A properly designed and fully permitted ADU can increase property value by adding legal living space and providing flexible use options such as rental income, guest accommodations, or housing for extended family.
In Mountain View’s competitive housing market, ADUs are often viewed as long-term investments when they are built to high standards and in compliance with local regulations. Factors such as layout, construction quality, finishes, and how well the ADU integrates with the main home all influence the value impact.
Working with a knowledgeable builder like W & W Builders Group helps ensure your ADU is thoughtfully designed and built to support both everyday use and long-term property value.
Most homeowners in Mountain View choose from three main ADU types based on lot layout, access, and project goals. W & W Builders Group can help evaluate which option fits your property and local requirements.
Common ADU types in Mountain View include:
Detached ADU: A standalone unit, usually in the backyard—ideal for privacy, rental income, or independent living space.
Attached ADU: Connected to the primary home, often built as an addition—great for expanding usable space while keeping a cohesive footprint.
Conversion ADU: Converts an existing area (garage or interior space) into a legal living unit—often one of the fastest and most cost-effective paths when the structure and utilities can be reused.
During the feasibility phase, W & W Builders Group reviews setbacks, access, utilities, and zoning basics to recommend the best ADU type for your Mountain View property.
Homeowners often explore several financing routes depending on equity, income, credit profile, and timeline. Common options include:
HELOCs or home equity loans
Cash-out refinancing
Construction / renovation loans
Personal savings or phased funding
Financing varies by lender and borrower qualifications. W & W Builders Group supports the process by providing clear scope planning and construction documentation, which can be helpful when you’re coordinating with a lender or evaluating monthly payment scenarios.
The best way to plan ADU construction in Mountain View is to start with three things: zoning feasibility, a defined budget range, and a clear decision on ADU type (conversion, attached, or detached). Early planning helps avoid redesign cycles and surprises during permitting.
Partnering with a local team like W & W Builders Group makes the process smoother because we can:
evaluate site constraints and access early
guide design decisions based on realistic budget and build conditions
manage permitting coordination and city responses
create a clear construction plan and timeline from day one
With a structured plan and the right ADU contractor in Mountain View, your project stays predictable, organized, and easier to approve and build.
Many homeowners coordinate ADU construction alongside full home remodeling in Mountain View to improve layout, flow, and overall functionality.
