Top Rated ADU Construction in San Marcos, TX

Transform your accessory dwelling unit into a stunning space with Austin’s trusted remodeling & renovation experts. We service all of Austin’s neighborhoods, such as South Congress, South Lamar, East Austin, Clarksville, Tarrytown, Barton Hills, Mueller, Brentwood, Westlake, and Barton Creek. We are proud to be a BBB Accredited Business.

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Creating Your Dream ADU With Satisfaction Guarantee - ADU Builds in San Marcos

An accessory dwelling unit is a separate build rather than a remodel — a small home with its own foundation, services and envelope, governed by rules that differ sharply between jurisdictions. What your lot allows is a planning question long before it is a design one. In San Marcos that usually means working with older homes near downtown and the university alongside newer subdivisions — which shapes what a accessory dwelling unit project involves here.

Explore Our ADU Construction Services in San Marcos

Garage Conversions

Converting an existing garage into a permitted living space — insulation, services, egress and finishes brought up to habitable standard.

Detached ADU Construction

Purpose-built detached units with their own foundation, envelope and services, sized to what the lot and local rules allow.

Tile & Flooring Installations

Tile and flooring installations that elevate your space's style and durability. We offer a range of high-quality options, from elegant ceramic tiles to sleek, modern vinyl flooring.

Sink & Faucet Installations

Upgrade your space with new sinks and faucets that blend style and functionality. Choose from modern, classic, or eco-friendly options tailored to suit your space's aesthetic.

Utility & Service Connections

Running water, waste, power and data to a secondary structure — usually the least visible and most underestimated part of an ADU budget.

Kitchenettes & Compact Kitchens

Compact kitchens planned for small footprints, with appliance sizing and worktop layout that keep a small unit genuinely liveable.

Built-In Storage & Space Planning

Built-in storage and space planning that make a small unit work for long-term occupancy rather than occasional use.

Wall Painting & Color Changes

Refresh your space with a new coat of paint or a bold color change. We use high-quality, moisture-resistant paints to ensure a lasting, beautiful finish.

HVAC, Insulation & Ventilation

Heating, cooling and insulation specified for a small independent building rather than borrowed from the main house.

Why Choose Our ADU Services?

San Marcos is an incorporated city in Hays County with its own building department, so permits run through City of San Marcos, not the City of Austin. We serve 78666. Permits and inspections for structural changes, mechanical relocation and additions run through City of San Marcos; straightforward cosmetic work generally does not. Many neighbourhoods here also carry association architectural review for exterior work, which runs on a separate timeline from the municipal permit. Requirements change — confirm current rules with City of San Marcos before finalising scope.

We Service:

Our Process for Luxury ADU Construction in San Marcos

At the heart of our work is your dream space. Here’s how we ensure your vision becomes a reality.

1

Personalized Consultation & Design

We collaborate with you to craft a design that matches your style and needs, ensuring every detail reflects your vision.

2

Material Selection & Customization

Choose from premium materials with guidance from our experts, balancing beauty, durability, and budget.

3

Flawless Execution

Our skilled professionals handle every step of the process with precision, ensuring high-quality results that exceed expectations.

4

Final Review & Client Approval

We walk you through the finished project to confirm every element meets your satisfaction, guaranteeing you'll love the results.

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Custom ADU Designs and Installations in San Marcos

The variables that decide an ADU are lot size, coverage limits, setbacks, height, parking and how utilities reach the new structure. A garage conversion and a detached new build are very different propositions in cost, programme and approval.

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ADU Finishes, Materials, and Storage Solutions

ADUs get built for guests, ageing parents, adult children and rental income, and the intended use should drive the layout from the start. A unit meant for long-term occupancy needs storage, sound separation and proper heating and cooling that a guest suite can do without. That thinking applies as much in San Marcos as anywhere else we work.

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No matter the size or scope of your project, we’re committed to delivering the highest quality craftsmanship and customer satisfaction. Let us help you create the accessory dwelling unit you’ve always wanted.

Frequently Asked Questions

Do I need a permit for a accessory dwelling unit (ADU) project in San Marcos? +

San Marcos runs its own building department, so permits go through City of San Marcos rather than the City of Austin. Homeowners are often surprised by that, and assuming Austin's rules apply is the most common planning mistake we see here. As a rule, structural changes, additions and any relocation of plumbing or electrical require a permit and inspections; straightforward cosmetic work such as replacing cabinetry, fixtures or flooring generally does not. Requirements change, so confirm the current position with City of San Marcos before you commit to a scope.

Which parts of San Marcos do you serve? +

We cover 78666 and the surrounding area. Most of the housing we work on in San Marcos is older homes near downtown and the university alongside newer subdivisions, which shapes what a accessory dwelling unit (ADU) project usually involves here.

What affects the cost of a accessory dwelling unit (ADU) in San Marcos? +

Scope drives cost far more than finish selection. Whether services move, whether structure is altered, and the condition of what is already there set the budget; materials adjust it at the margins. Local factors matter too — in San Marcos the housing being older homes near downtown and the university alongside newer subdivisions tends to determine how much preparatory work a project needs before the visible work starts.

How long does a accessory dwelling unit (ADU) project take in San Marcos? +

Timelines depend on scope and on how quickly review moves through City of San Marcos. We give a programme with the quote rather than a generic range, and we schedule trades in sequence so the site is not standing idle waiting on a single item.

What does San Marcos allow for an ADU? +

That is the first question and it is decided by City of San Marcos, not by design preference. Lot size, coverage, setbacks, height, parking and utility access all constrain what is possible, and the rules differ sharply between jurisdictions. We establish your lot's limits before drawing anything.

Is a garage conversion cheaper than building new? +

Usually, because the foundation and envelope already exist. But a conversion has to be brought up to habitable standard — insulation, services, egress and ventilation — and if the existing structure is poor the saving narrows quickly.

What do people use ADUs for here? +

Guests, ageing parents, adult children and rental income. The intended use should drive the layout from the start: a unit meant for long-term occupancy needs storage, sound separation and proper heating and cooling that a guest suite can do without.

Are you licensed and insured to work in San Marcos? +

Yes. We carry insurance and work to the licensing requirements that apply for the trades involved, and we pull permits through City of San Marcos ourselves rather than leaving that to the homeowner. If you would like to see current documentation before signing anything, ask and we will send it.

What should I expect if my San Marcos home is older? +

Older properties bring conditions newer construction does not — original wiring, ageing supply and waste lines, and framing built to different standards. Given the housing in San Marcos is older homes near downtown and the university alongside newer subdivisions, we survey what is actually there before quoting rather than pricing an assumption and revising later.

How do we get started? +

A free in-home consultation. We look at the space, talk through what you want and what your budget realistically covers, then produce a fixed-price quote. Nothing is committed until you have that in writing, including the programme and what is and is not in scope.