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Additions & Casitas

Room additions, detached casitas, garage conversions.

Permitted engineering, clean tie-ins to existing structure, and an exterior finish that looks like it was always there.

Additions are the project most likely to look added — and that’s usually because somebody cut corners on the tie-in. The new roof line doesn’t carry. The stucco color is two shades off.

We build additions to match. New footings tied to existing per engineering. Roof framing scarfed clean. Stucco color matched on a slab sample, not eyeballed. Window package selected to match the house.

Casitas — detached or attached — are a fast-growing scope in Phoenix. Multigenerational, rental-eligible, or just a real guest suite. We permit them as ADUs where the city allows it, with full kitchens or kitchenettes, full baths, and finishes that match the main house.

Scope types

What we build under this category.

Room additions

Bedroom, primary suite, family room, office. Attached to the existing footprint with matching envelope.

Detached casitas

400–800 sq ft permitted structures. Full bath, kitchenette or full kitchen. Often ADU-eligible.

Garage conversions

Permitted conversion to conditioned space. Mini-split, finished walls and floor, full bath if plumbing reaches.

Second-story additions

Where the lot, code, and existing structure all allow. Engineering-heavy. We’ll tell you honestly if it pencils.

Bump-outs

Kitchen or primary suite expansion under a continuation of the existing roof line. Faster permit, cleaner finish.

Workshops & studios

Insulated, conditioned outbuildings with electrical sub-panels and finish quality matching the main house.

Budget bands

What additions actually cost.

Wide variance. Driven mostly by foundation, roof tie-in, and finish level.

$80–$180K

Bump-out / small

100–300 sq ft, attached, matching envelope.

$180–$400K

Casita

400–700 sq ft detached structure, full bath, kitchen or kitchenette.

$400–$900K+

Major addition

800+ sq ft addition, primary suite plus living, second-story work if applicable.

FAQ

Common questions.

Do I need a permit and zoning approval to add a room or build a detached casita?

Yes. Room additions, detached casitas or ADUs, and garage conversions all require permitted, engineered plans, and each Phoenix-metro city runs its own building and zoning department with its own rules for lot coverage, setbacks, height, and whether a detached second dwelling is allowed on your lot. If you're in a master-planned community, HOA architectural review is common and often runs alongside the city process, not instead of it. We handle the engineering, submittal, and inspections; we submit ready.

How do setbacks and lot coverage affect where my addition or casita can go?

Every lot has required setbacks (minimum distances from property lines) plus a cap on how much of the lot can be covered by structures, and those numbers vary by city and zoning district. Those limits, not just your preference, determine where a casita can sit and how big an addition can grow, especially on tighter interior lots. We verify the buildable envelope against your parcel and the local code before designing, so the plan we bid is one the city will actually approve.

Will an addition or casita match my existing house?

That's the whole point of doing it right. We match the roofline, stucco texture and finish, fascia, window style, and paint so the new work reads as original rather than bolted-on, and in HOA communities that architectural continuity is usually required for approval anyway. Because it's one in-house crew doing the framing, envelope, and stucco, the transition between old and new stays tight instead of getting handed off and mismatched.

How do you tie a new addition into a slab-on-grade home, and does that limit plumbing?

Most Phoenix-area homes sit on slab-on-grade foundations, often post-tension, so a new foundation has to be engineered to connect properly to the existing slab and any plumbing routed through it has to be planned, not improvised. Post-tension slabs in particular can't just be cut wherever you'd like, which shapes where a new bathroom or kitchenette in a casita can go. We engineer the foundation tie-in and the plumbing routing up front so the layout is buildable, not a surprise mid-project.

What desert-climate details matter most on an addition or casita?

New square footage lives in the same brutal summer heat as the rest of the house, so wall and attic insulation, radiant barrier, low-E windows, right-sized HVAC, and smart orientation and shading all matter for comfort and energy cost. The summer monsoon (roughly July through September) brings wind and heavy rain, so envelope integrity, roof flashing, and grading and drainage around the new footprint have to be done right the first time. Building an addition to the same standard as the original home, rather than as a cheap bump-out, is what keeps it comfortable and dry year-round.

Can a garage conversion count as living space, and what does it involve?

A garage conversion can become a legitimate room or in-law suite, but it has to be permitted and brought up to living-space code: insulation, proper egress, HVAC, and often the floor, walls, and any water lines reworked to habitable standards. Some cities and HOAs also require you to preserve covered parking or maintain the exterior appearance, so it's not simply drywalling over the door. We confirm what your city and HOA allow, then engineer and permit the conversion so it's fully legal square footage, priced as a fixed bid.

Still have a question?

Ask us on the walk-through — you’ll get a straight answer and a fixed-price bid.

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Related services

Explore the rest of the work.

One crew handles every scope below — kitchens, baths, additions, outdoor, envelope. Same standard across the board.

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Thinking about adding on?

Bring us in early. Feasibility and rough budget on the first walk.