Room Additions & ADUs · South Orange County
More space. More value. Built to last — by one team.
Services·Room Additions & ADUs
Custom Room Additions & ADU Design-Build in South Orange County
We've built more than extra square footage — we've built better solutions for families, income needs, and future plans. As a trusted ADU builder and room addition contractor in South Orange County, we manage everything from site planning and permitting to design, engineering, and construction — so you never have to worry about setbacks, soil reports, HOA approvals, or city inspections.
What We Build
ADUs and room additions
what's the difference?
ADUs (Accessory Dwelling Units) are independent living units on your property — backyard cottages, pool houses, guest houses, garage conversions, or attached suites. They can be rented for income, used for family, or simply add significant resale value.
Detached ADU
A fully independent backyard cottage, guest house, or pool house with its own entrance, kitchen, and living space. The most flexible and highest-value ADU type for South OC properties.
Garage Conversion ADU
Transform an underused garage into a fully permitted, code-compliant living unit. One of the most cost-effective ways to add rental income or family housing to your existing property.
Attached ADU
An addition connected to your main home with a private entrance — ideal for multigenerational living or a rental suite that stays close but feels independent.
Junior ADU (JADU)
Up to 500 sq. ft. created within your home's existing footprint — a converted bedroom, attached garage, or interior space. Lower cost, faster permitting, same quality finish.
Vertical Expansions
Structural Second-Story Additions & Vertical Expansions
When lot lines, tight setbacks, or protected coastal view corridors prevent you from expanding outward, building up is the ultimate way to double your living area and capture panoramic ocean or valley views across South Orange County.
However, a vertical expansion is not just a simple framing job — it is a heavy structural alteration. Adding thousands of pounds to an existing footprint requires master builder engineering to evaluate your slab, reinforce shear walls, and establish continuous load paths down to the earth.
Master Builder Oversight for Vertical Builds
At Tuscany Builders, 50-year Master Builder Dino Presutto manages vertical expansions with total structural authority:
Foundation & Load-Path Verification
We test and verify that your existing foundation can legally and safely support a second level before architectural plans are drawn.
Weather-Tite Framing Execution
Fast, continuous structural framing to keep your home sealed and protected against coastal elements throughout the build.
Seamless Architectural Integration
Tailored rooflines, exterior stucco and siding matches, and custom stairwells designed so the second story looks like an original build feature rather than an add-on.
Planning a Vertical Expansion? Don't risk expensive structural redesigns with a firm that does not understand structural math.
Schedule a $1,500 Remodel JumpstartWhy Homeowners Choose ADUs & Additions
More than square footage.
A smarter investment.
Multigenerational Living
Create a private space for aging parents or adult children while keeping everyone close under one property.
Rental Income Potential
Earn passive income with a fully equipped, code-compliant ADU. Most South OC cities allow long-term rentals of 30+ days.
Increased Property Value
Well-planned additions and ADUs significantly boost resale value in high-demand South Orange County neighborhoods.
Upgraded Lifestyle
A custom design tailored to your family's needs — whether it's a new master suite, studio, or guest unit.
Work & Creativity Space
Build a quiet, dedicated area for remote work, fitness, or hobbies — without leaving home.
Our Process
Five steps from concept
to move-in day.
01
Meet
Dino visits your property, reviews zoning, setbacks, and HOA requirements, and discusses your goals and budget in person.
02
Design
We develop a custom layout plan and fixed-price estimate tailored to your property and goals — before any work begins.
03
Plans & Permits
Our team handles all architectural drawings, engineering, city submittals, HOA approvals, and OCFA coordination.
04
Build
Dino is on your jobsite every single day. All trades are coordinated in-house — no subcontractor juggling.
05
Enjoy
Final walkthrough, punch list, and certificate of occupancy. Your new space is ready to live in, rent, or sell.
FAQ
ADU & addition questions, answered.
Can't find your answer? Email us at tbuildersca@gmail.com or call (949) 362-1876.
Room Additions & ADUs · South Orange County
Ready to explore your options?
Let's talk about your space and your goals. Dino will reach out within one business day to schedule an in-home visit anywhere in South Orange County.