Serving the Valley
Home Additions Built Right in Gilbert, AZ
Bayside Home Builders designs and builds room additions, second stories, and casitas across Gilbert with permits handled, no surprises, and a fixed scope before we break ground.
home addition project · GilbertYour Gilbert Home Has the Space. The Floor Plan Just Does Not Use It.
A lot of Gilbert homes were designed for affordability and built fast during the Valley's growth boom. The result is standard bedrooms, dated layouts, and square footage that does not match how your family actually lives today.
What you are living with
You are converting the dining room into a bedroom for a parent or a teenager, using a garage as overflow storage because the house has no flex space, or putting guests in a room that doubles as a home office. None of that works long-term, and rearranging furniture does not fix a floor plan.
What you get instead
A ground-floor addition or a casita in the backyard gives you dedicated space without displacing the rest of the house. Gilbert lots, especially in neighborhoods built before 2005, often have enough rear yard depth to add 400 to 800 square feet without touching your setbacks. We will tell you what your lot can support before you spend a dollar on plans.
Our Recent Work
Home Additions Built to Match Your House and Your Budget
A well-built addition should look like it was always part of the house, not bolted on after the fact. We handle design, permits, and construction under one roof so nothing falls through the cracks between trades.
Architectural Design and Drawings
We produce permit-ready drawings in-house. That means the person designing your addition is the same team building it, so details do not get lost in translation between an outside architect and a general contractor.
Permit Pulling and Inspections
We submit to the local building department, track the permit, and schedule all required inspections. You do not have to chase paperwork or figure out which inspector to call.
Foundation and Structural Work
Every addition starts with a proper footing and stem wall or slab matched to your existing foundation type. We do not skip the structural engineer when the project calls for one.
Framing, Roofline Tie-In, and Exterior Finish
We frame the addition and tie the roofline into the existing structure so water sheds correctly. Exterior stucco, trim, and paint are matched to your current home as closely as the existing material allows.
Mechanical, Electrical, and Plumbing Rough-In
HVAC, electrical circuits, and plumbing are extended from your existing systems by licensed subcontractors we have worked with for years. We coordinate the schedule so no trade is waiting on another.
Interior Finish and Final Walkthrough
Drywall, insulation, flooring, doors, trim, and paint are completed to match the rest of your home. Before we close out the permit, we walk the finished space with you and address any punch-list items on the spot.
Why Homeowners Choose Bayside Home Builders for Additions
There are a lot of contractors who will take your deposit and figure out the hard parts later. Here is what actually separates us.
Licensed, Bonded, and Insured, AZ ROC 353387
Our license number is public record. You can look it up on the Arizona Registrar of Contractors website before you sign anything. That license requires us to carry liability insurance and a bond, which protects you if something goes wrong on the job.
Design and Construction Under One Contract
Most homeowners who hire a separate architect and then a separate contractor end up managing conflicts between the two. Because we do both, the drawings reflect what is actually buildable at your budget, and change orders caused by design errors are our problem, not yours.
Family-Owned, So the Owner Is Reachable
You are not working with a sales rep who disappears after signing. As a family-owned business, the people making decisions on your project are the same people you can call when you have a question. No call centers, no ticketing systems.
We Tell You the Real Scope Before You Commit
Additions often uncover existing issues, undersized electrical panels, inadequate HVAC capacity, or code violations in the area being tied into. We flag these during the estimate, not after demolition starts. You deserve to know the full picture before you sign a contract.
What our clients say
Today we finished my kitchen and bath remodel. I worked with Paul who was nothing short of excellent. Not only did he design the kitchen and bath but he cared enough to order and oversee everything down to the tiniest detail. He suggested patterns…
We had an amazing experience with a whole house remodel with Bayside. Yarden was there for us throughout the entire process through design, picking materials and the construction. I have to admit I was a little nervous because of friends that have…
How a Home Addition Project Works With Us
From the first conversation to the day you move in, here is what to expect. No surprises, no hand-off to a project manager you have never met.
Step 1: On-Site Consultation and Scope Review
We come to your home, walk the space, and listen to what you are trying to accomplish. We look at your existing structure, roof, and mechanical systems to identify anything that will affect the addition before we put a number together. This visit is where we ask the questions other contractors skip.
Step 2: Design, Proposal, and Contract
We develop the design concept and a detailed written proposal that breaks down what is included and what is not. Once you approve the scope, we sign a contract with a fixed price and a project schedule. No open-ended time-and-materials arrangements.
Step 3: Permits and Pre-Construction
We submit permit drawings to the building department and order materials once the permit is approved. We confirm the construction schedule with you before anyone sets foot on your property with tools. You always know when work is starting and what happens that week.
Step 4: Construction, Inspections, and Final Walkthrough
We build the addition, schedule all required inspections, and keep you updated at each phase milestone. When construction is complete, we walk the finished space with you, close out the permit, and hand you the documentation. Your addition is yours, permitted and finished.
What Home Addition Costs
Here is what Gilbert home additions actually cost, based on what we build in this market.
Additional bedroom
A single-room addition tied into the existing home.
Master suite
A primary bedroom and bath addition.
Casita or guest house
A detached accessory dwelling.
Gilbert runs its own permitting office separate from the county, and plan review for a standard room addition typically takes several weeks from submission to approval, so budget that wait into your timeline before a shovel touches the ground. Most Gilbert homes sit on post-tension slab foundations, which requires a structural engineer to sign off on how the new addition ties in, and that engineering work adds both cost and a few weeks to the front end of the project. The newer master-planned subdivisions that cover much of Gilbert also tend to have HOA design review on top of city permitting, meaning you may need approval from two separate bodies before work can begin.
Home Additions in Gilbert, AZ
Gilbert's housing stock skews toward tract homes built in the 1990s and 2000s, mostly single-story with standard lot sizes. There is room to add on, but you need a contractor who knows the city's permit process and can work within HOA setback rules that are common in this part of the East Valley.
Permits & review
All home additions in Gilbert require a building permit through the City of Gilbert's Development Services department. Plan review takes time, and you should budget for that wait before any framing starts. We handle permit applications and submissions so you are not chasing paperwork. Expect inspections at foundation, framing, and final stages.
Housing stock
Most Gilbert homes were built between the early 1990s and the mid 2000s. That means wood-frame construction, slab foundations, and floor plans that often have room to push out the back or side yard. We assess your existing structure before quoting so there are no surprises when we tie into your current framing, roof, or HVAC system.
Areas we serve
We serve Gilbert and the surrounding East Valley, including Chandler, Mesa, Tempe, and Scottsdale. If you are in the Gilbert area and need a room addition, a second story, an ADU, or a casita, we can come out for a site visit and give you real numbers.
Common questions
How much does a 12×12 room addition cost in Gilbert, AZ?
A 144-square-foot room addition in Gilbert typically runs $28,000 to $55,000 depending on finish level, whether it needs a foundation pour, and how the new space ties into existing HVAC and electrical. A basic bedroom with standard finishes lands toward the low end. A primary suite with a bathroom, tile work, and upgraded fixtures pushes toward the high end or beyond. Any contractor quoting you a firm number before seeing your site and your plans is guessing.
How long does a home addition take to permit and build in Gilbert?
Gilbert's building department currently runs permit reviews in the range of 4 to 10 weeks for a standard room addition, depending on plan complexity and their current queue. Once permits are in hand, construction on a single-story addition typically takes 8 to 16 weeks. A second-story addition or one with significant structural work can run 16 to 24 weeks. We build the permit timeline into your project schedule upfront so it does not catch you off guard.
What is the 30 percent rule for renovations, and does it apply to additions?
The 30 percent rule is a general rule of thumb from financial planning circles suggesting you should not spend more than 30 percent of your home's current value on a single renovation project if you want to protect resale value. It is not a code requirement or a law. In Gilbert's current market, where home values have risen steadily, a well-designed addition often returns solid value, especially if it adds a bedroom, a bathroom, or a detached casita that can serve as rental income. We will give you an honest read on what makes financial sense for your specific address.
Do I need a permit for a home addition in Gilbert?
Yes, always. Any addition that adds conditioned square footage, touches the structure, or extends utilities requires a permit from the Town of Gilbert. Building without one creates title problems when you sell and can require you to tear out work for inspection after the fact. We pull every permit, schedule every inspection, and give you a closed permit file when the project is done.
What types of home additions do you build in Gilbert?
We handle single-story room additions, primary suite expansions, second-story additions, attached garages converted to living space, detached casitas, and ADUs. Gilbert allows ADUs on most single-family lots under state law that went into effect in 2023, which opens up options many homeowners did not know they had. If you are not sure what is possible on your lot, we can pull the zoning and setback requirements before you spend anything.
How do you handle the design and engineering for a Gilbert home addition?
We are a design-build firm, which means design, structural engineering, and construction run through one contract and one point of contact. You do not hire an architect separately and then hunt for a builder who will work from those plans. Our process starts with a site visit, a scope conversation, and a design agreement. Structural drawings get stamped by a licensed Arizona engineer before anything goes to the Gilbert permit office.
What should I watch out for when hiring a home addition contractor in Gilbert?
Three things cause most of the problems we see. First, bids that leave out site work, engineering, or permit fees so the number looks low until you sign. Second, contractors who start work before permits are issued to save time, which puts you at legal risk. Third, vague contracts with no fixed scope, which makes change orders easy to pile on later. Ask any contractor you talk to for their ROC license number, proof of insurance, and a sample contract before you go further. Ours are available on request.
Keep exploring
Other services in Gilbert
Bathroom Remodeling→Kitchen Remodeling→Home Renovation→Adu→Home Builder→
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