Overview

Building an accessory dwelling unit (ADU) is a strategic move, whether you want to earn rental income, house loved ones, or increase your home’s resale value. To help you get started, Cloud Nine Construction’s licensed ADU contractors have created this comprehensive guide to walk you through everything from ADU types and regulations to design tips and construction planning.

Highlights

Introduction

Building an ADU offers numerous benefits. Before you start drawing up plans, you need to consider the kind of space you want to develop, who will occupy it, your budget, and what rules apply to your neighborhood and construction plans. A firm grasp of the process and what to expect will help you avoid common mistakes during ADU planning and construction.

What Is an ADU?

Accessory dwelling units (ADUs), which are sometimes called granny flats, in-law suites, or backyard cottages, are self-contained residential units on the same lot as your primary home. ADUs can be attached or detached. They typically include a kitchen, bathroom, and sleeping area.

Are ADUs Allowed in Fresno and Clovis?

Yes, but with important distinctions. Fresno and Clovis have adopted California’s statewide ADU laws, encouraging residential densification. However, Clovis is known for stricter zoning and design standards, while Fresno tends to offer more flexible options.

Things to check before building include:

  • Zoning and lot size
  • Setbacks and height limits
  • Owner occupancy requirements
  • Parking mandates (especially for detached ADUs)

Consult your city’s planning department or a local ADU contractor for up-to-date info.

Why Build an ADU Unit?

Secondary dwelling units can become a steady source of rental income or provide private living space for family members, including aging parents who wish to remain close while maintaining independence. Adding a fully functional, self-contained unit to your property is also a smart way to increase your home’s resale value.

Many people use ADUs as quiet, dedicated office spaces or guest quarters in today’s work-from-home era. Housing affordability is a challenge in cities, and ADUs offer a practical, long-term solution that benefits property owners and renters.

Who Can Benefit from Building an ADU?

ADUs are especially helpful for:

  • Multigenerational families
  • Homeowners preparing for retirement
  • Caregivers or nannies
  • Remote workers in need of private office space

ADU living offers a distinctive blend of privacy and accessibility. They also promote more sustainable land use by maximizing the use of the residential lot you already hold through thoughtful infill development.

Can You Rent Out an Accessory Dwelling?

Yes. Long-term rentals are permitted in Fresno and Clovis, but short-term rentals (like Airbnb) may be restricted, especially in Clovis. Review local ordinances and occupancy rules carefully if you plan to rent out your ADU.

Do ADUs Increase Your Property Value in California?

Yes. A legal, modern ADU can boost your property’s appraised value, especially when it’s income-producing or designed with high-quality finishes. Be aware that it may also slightly increase your property taxes based on the added value.

Do You Need a Permit To Build ADU Housing?

Permits apply to most ADU housing developments. The permitting process ensures your project complies with local building codes and safety standards. To get started, you’ll need to submit detailed site plans, architectural drawings, and documentation proving your project meets California’s Title 24 energy efficiency requirements.

Is your property located in a designated historic district? Additional reviews may be necessary. Throughout construction, your ADU will also be subject to multiple inspections to ensure everything from the foundation to the final finishes meets regulatory standards.

Will Your ADU Contractor Handle Permit and Approval Applications?

Yes. Most reputable ADU contractors offer design-build services, which include:

  • Drafting site plans
  • Submitting permit applications
  • Navigating zoning reviews
  • Coordinating inspections

Make sure your contractor is experienced with local codes to avoid delays.

Which Types of Additional Dwelling Units Can You Build?

Depending on your lot, zoning restrictions, budget, and goals, you can build the following.

Backyard ADUs

These standalone units are typically located behind your main house, offering privacy and versatility.

Garage ADUs

These housing spaces can either convert an existing garage or add a new unit above it, maximizing space without expanding your footprint.

Attached ADUs

These units are connected to your main home but feature separate entrances, making them ideal for family members or renters.

Detached ADUs

Detached ADUs are fully independent structures that offer the most separation and design freedom.

Junior ADUs

This type of space is smaller, usually under 500 square feet. It’s often built within your existing home and may share some facilities with your primary residence.

Two-Story ADUs

Two-story ADUs are great for homeowners with limited yard space who still want a spacious secondary unit.

You can have two-story ADUs built, provided you meet height restrictions and setback requirements. This is a popular option in denser neighborhoods or for ADUs over garages. Two-story units can’t block neighbor views or create privacy issues, so design carefully.

Office ADUs

Office ADUs are purpose-built for remote work or a studio.

Granny Units

These tiny homes are commonly designed for elderly family members who need nearby but private accommodations.

Accessible Secondary Dwellings

Accessible secondary dwellings are thoughtfully designed to meet mobility and aging-in-place needs. They feature wider doorways, no-step entries, and accessible bathrooms.

How Do You Draft Accessory Dwelling Unit Plans?

The best way to plan your build is to partner with a solid design-build-focused construction company experienced in ADU planning.

Your locally licensed ADU builder will help you create construction plans that reflect the following:

  • Site orientation
  • Sun exposure and ventilation
  • Parking layout (if required)
  • Local aesthetic standards
  • Privacy from neighbors

How Do You Choose Construction Materials and Finishes for an Auxiliary Dwelling Unit?

Your material choices depend on your budget, preferences, and your building’s purpose.

In California’s hot summers and cool winters, consider:

  • Insulated roofing and siding
  • Energy-efficient windows and doors
  • Durable flooring like tile or vinyl
  • Low-maintenance exterior materials
  • Solar-ready features (if required)

What Are the Requirements of Building an ADU?

Building an ADU isn’t as simple as just starting construction. It requires navigating a range of legal, zoning, and design considerations. Understanding the key requirements is essential to ensure your ADU project is compliant and successful.

Are There Size Limits for ADU Construction?

Yes. According to state and local regulations, the following size limitations apply to ADU construction:

  • Detached ADUs: Up to 1,200 sq ft
  • Attached ADUs: Up to 50% of main dwelling size, max 1,200 sq ft
  • JADUs: Maximum 500 sq ft

What Are the Setback Requirements for ADU Homes?

In general:

  • Rear and side setbacks: 4 feet for detached ADUs
  • Front yard setbacks: Must comply with main home zoning
  • Fire separation distances: May apply for attached units

Variances may be possible but require approval.

Do You Need To Provide Parking for Your ADU?

Parking requirements are often waived, especially if your ADU is within 0.5 miles of public transit or is part of an existing structure (like a garage conversion). However, some areas in Clovis may have stricter parking rules.

Check with the local building department or ask your builder for expert guidance.

Can Your Home and Secondary Dwelling Share Existing Utility Hookups?

Yes. You can share water, gas, and electrical systems with the primary home or choose separate metering if desired. Some upgrades to your existing service panel or plumbing lines may be required.

Can You Convert Your Garage or Build an ADU on Top of It?

Yes. Garage conversions are cost-effective, but you must ensure:

  • Proper insulation
  • Ceiling height and floor level adjustments
  • Windows and egress doors
  • Fire-rated construction

Building a second story above the garage is also an option, though it may require some structural reinforcements.

What Blunders Should You Avoid When Designing and Building an ADU?

Some common mistakes can quickly derail your construction plans.

Here’s what to avoid when you want to build value into your property by adding an ADU:

  • Skipping feasibility studies or not confirming zoning laws: Without proper research into your property’s zoning laws, setbacks, and allowable build types, your ADU project could be delayed or denied entirely.
  • Underestimating total project costs: Don’t forget to account for permitting fees, utility connection upgrades, and site preparation expenses, which can all add up to a final project cost much more than you anticipated.
  • Neglecting privacy or accessibility in design decisions: Overlooking features like separate entrances, soundproofing, or universal design elements can reduce your new unit’s comfort and value.

Build More Equity Into Your California Property

Building an ADU in the heart of California’s competitive housing market is a wise investment in your property’s future. ADUs offer tremendous benefits, whether you’re creating space for family, generating passive income, or simply increasing home value.

Partnering with an experienced builder ensures your project adds lasting value and seamlessly integrates with your lifestyle. If you’re looking for a trusted ADU builder, contact Cloud Nine Construction at (559) 289-8991 today to schedule your consultation.