Garage Conversion & ADU Construction in Avondale, AZ
Turn Your Garage Into Living Space — Or Build an ADU
An accessory dwelling unit (ADU) is a self-contained living space located on the same lot as a primary residence. It can be an attached or detached structure, a converted garage, or an internal conversion. A garage conversion repurposes your existing attached or detached garage into fully conditioned, finished living space — without adding to your footprint. Both are among the most cost-effective ways to add usable square footage to your Avondale property.
Homeowners take on these projects for a few main reasons. A well-finished ADU with its own entrance, kitchenette, and bathroom can produce long-term rental income that offsets part of the project cost, where your zoning and HOA allow it. Multigenerational families convert garages to give aging parents or adult children a private, independent space without the cost of a second property. And Avondale is a young, family-heavy city — the Census Bureau puts the median age at about 33 — so a converted garage often becomes the home office, playroom, or guest suite a growing household needs without moving.
Infinity Kitchens and Baths offers a complete design-build service for garage conversions and ADUs in Avondale. We are licensed, bonded and insured (AZ ROC #339999), family-owned since 2011, and we handle everything in-house: architectural drawings, structural work, HVAC, plumbing, electrical, insulation, drywall, flooring, and all finish selections. You work with one team from the first in-home consultation through the City of Avondale’s final inspection.
What You Can Do With a Garage Conversion or ADU
A converted garage or newly built ADU can serve almost any purpose. Here are the most popular uses our clients choose.
Rental Unit / Income Property
A self-contained ADU with its own entrance, kitchen, and bathroom can earn long-term rental income that offsets your mortgage or funds other home improvements. Confirm with the city and your HOA that renting the unit is allowed on your lot before you design around it.
Guest Suite
Give visiting family members a private, comfortable space that's close but independent. A finished guest suite with a full bath and small sitting area provides far more comfort than a spare bedroom — and far more privacy for everyone.
Multi-Generational Living
Aging parents or adult children can maintain independence with their own private entrance, kitchenette, and living area — all steps from the main house. It is one of the most practical ways to keep family close while giving everyone their own front door.
Home Office / Studio
Work from home in a separate, professional environment that's free from household distractions. A converted garage makes an ideal home office, creative studio, or remote work hub — with proper insulation, lighting, and climate control built in.
Short-Term Rental (Airbnb / VRBO)
A tastefully finished ADU or converted garage with its own entrance can work as a furnished short-term rental. Check the city’s current rules and your HOA’s covenants first — covenants can limit rentals — and plan durable, easy-to-clean finishes for guest turnover.
Hobby Room / Workshop
Whether you need space for woodworking, art, music, or fitness, a fully conditioned and finished garage conversion gives you a dedicated area that doesn't eat into your living space. Proper insulation and HVAC make it comfortable year-round, including Avondale summers, when July highs average about 106°F (National Weather Service 1991–2020 normals for the area).
What a Garage Conversion Includes
A garage conversion is more involved than a simple interior renovation. It requires bringing an unfinished, unconditioned space up to residential building code. Here's what that means in practice.
Structural Work
The garage door opening must be infilled with framed wall, sheathing, insulation, and exterior cladding that matches or complements the existing home. This is one of the most visible elements of a conversion and when done well, can make the transition nearly invisible from the street.
The existing concrete slab typically needs waterproofing and a vapor barrier before any flooring can be installed. Depending on the slab condition, we may also need to address cracking, slope, or drainage issues. Walls are framed for insulation — we install a minimum of R-19 in exterior walls, with R-30 or better in the ceiling, and final insulation levels follow the energy code the City of Avondale enforces (the 2024 International Energy Conservation Code with city amendments). The city inspects insulation before drywall goes up.
Window placement matters both for natural light and egress compliance. If the converted space will be used as a bedroom or sleeping area, at least one window must meet egress size requirements under the International Residential Code as adopted by the City of Avondale (the 2024 edition, with city amendments, effective Jan. 1, 2026).
Mechanical & Finishes
Heating and cooling a converted garage requires its own HVAC solution. We most commonly install a ductless mini-split system, which is highly efficient, provides both heating and cooling, and avoids the need to extend existing ductwork. Mini-splits are well suited to Avondale's climate: cooling is the big load here, with about 111 days a year at 100°F or hotter, and a heat-pump mini-split also handles cool winter nights. A former garage has a lot of exposed wall and ceiling, so we size the system for the space as insulated, not as a garage.
If the conversion will include a bathroom, laundry, or kitchenette, plumbing rough-in must be planned early — ideally before the slab is covered. Running supply and drain lines in a concrete slab may require cutting and patching. The electrical panel may need upgrading to accommodate the new circuits for HVAC, lighting, outlets, and appliances. Garages often house the water heater, water softener, or laundry hookups, and those have to be relocated or properly enclosed. Avondale’s city well water is very hard — about 21 grains per gallon in the city’s 2022 water quality report — so we keep softened water in the plan for any new bathroom or kitchenette.
Finish work includes drywall, tape, texture, and paint; your choice of flooring (LVP, tile, or hardwood); interior doors and trim; cabinetry and countertops if a kitchenette or wet bar is included; and fixture and hardware selection throughout. Our team coordinates all trades and finish selections under one contract, so nothing falls through the cracks.
Garage Conversions & ADUs in Avondale: What to Confirm First
Zoning rules for ADUs change over time and depend on your specific lot. We don’t quote them from memory — we verify current requirements with the City of Avondale before beginning any project. Here’s what gets checked and why.
Zoning, Size & HOA Approval
Whether you can add an ADU, how large it can be, where a detached unit can sit on the lot, and whether parking must be replaced are zoning questions. The answers depend on your lot’s zoning district and the city’s current code, so at the start of every project we confirm them for your parcel with the City of Avondale’s Development Services Department. Arizona’s state-level ADU legislation has progressively reduced local governments’ ability to restrict ADU development, which is one more reason to check today’s rules rather than rely on what a neighbor was told years ago.
If your home is in a homeowners association, check its covenants too. The city does not track restrictive covenants and tells owners to check with their HOA or title company before coming to the city for a permit. Covenants can govern exterior changes such as infilling the garage door, and some limit rentals, so we review them with you before design.
Also confirm your address is inside city limits. A small number of parcels in Avondale ZIP codes sit in county islands, where Maricopa County, not the city, sets the rules.
Permits, Inspections & Timeline
Turning a garage into living space, or building a detached ADU, needs a building permit from the City of Avondale’s Building Services Division (11465 W. Civic Center Dr., 623-333-4000), filed online through the city’s Accela portal. The city’s residential plan review checklist requires a soils report for all construction containing livable area, so a new detached ADU will need one; for a conversion of an existing garage, we confirm with plan review whether it applies. A new ADU on its own foundation gets footing, pre-slab and under-slab plumbing and electrical inspections; every project gets rough framing, plumbing, electrical and mechanical inspections, an insulation inspection before drywall, and finals. See our guide to Avondale remodeling permits.
A typical garage conversion takes three to five months from start to final Certificate of Occupancy, depending on scope, contractor scheduling, and inspection turnaround times. More complex ADU new construction projects may take longer. We give you a realistic project timeline during the design phase so you can plan accordingly.
We handle all required permits and inspections for your project, including the drawings and documentation the city asks for, so you can stay focused on the finished space rather than the paperwork.
Note: Zoning and ADU regulations change regularly, and we verify current requirements for your specific parcel before proceeding.
Our Garage Conversion & ADU Process
We've developed a clear, step-by-step process that keeps your project on schedule and on budget. Here's what to expect from start to finish.
Site Feasibility & Zoning Review
We start by reviewing your property's zoning classification, lot size, existing structures, and setbacks, and we confirm with the City of Avondale that a garage conversion or ADU is permitted under current rules. We'll identify any restrictions, easements, or HOA requirements that may affect the project, and give you a clear picture of what's possible before any design work begins.
Design & Construction Plans
Our design team develops a floor plan, construction drawings, and all required documentation for your project. We walk you through the layout, discuss finish options, and lock in the project scope. Once approved, you have drawings you own — not renderings, but actual construction documents.
Structural & Mechanical Rough-In
Once approvals are in place, we begin the structural work: garage door infill, framing, slab prep and vapor barrier. Immediately following, our licensed plumbing and electrical subs complete all rough-in work — supply lines, drain lines, panel upgrades, circuits, and HVAC system installation — before any walls are closed. All rough-in work is inspected before proceeding.
Insulation, Drywall & Finishes
After rough-in inspections pass, we install insulation (R-19 walls, R-30 ceiling minimum), then hang, tape, texture, and paint drywall. Flooring, cabinetry, countertops, trim, doors, fixtures, and hardware are installed in the correct sequence to minimize callbacks and damage. This phase is where the space truly transforms from a construction site into a finished room.
Final Inspection & Certificate of Occupancy
Once all work is complete, we schedule the final inspections with the City of Avondale. Upon passing, the city’s final approval (and a Certificate of Occupancy, where one is issued) formally confirms the space is legally habitable and compliant with all applicable codes. We walk you through the finished space, review all systems, and hand over your warranty documentation.
Related Services
Garage conversions and ADUs often pair naturally with other whole-home projects. Explore our full range of remodeling services below.
Home Additions
Add square footage by building out rather than converting existing space. Room additions, second-story additions, and bump-outs give you new space where you need it most.
Learn More →Design-Build Services
Our integrated design-build model means one team handles design and construction. No gaps in communication, no finger-pointing between contractors.
Learn More →Whole House Remodeling
If your project extends beyond the garage, our whole-house remodeling team can coordinate every room — kitchen, bathrooms, living spaces, and more — under one contract.
Learn More →Garage Conversions Are Part of Our Full Remodeling Services
From a single garage conversion to a complete home transformation, Infinity Kitchens and Baths delivers craftsmanship and design talent across every project type.
View All ServicesGarage Conversion & ADU FAQ
Let’s Put Your Garage to Work
Whether you're ready to build a rental ADU, create a private suite for family, or convert dead garage space into a room you'll actually use — Infinity Kitchens and Baths handles it from design through the city’s final inspection. Contact us for a free in-home consultation and written estimate at your Avondale home.