Serving The Tampa Bay Area
ADU Construction
Accessory Dwelling Unit Construction in Tampa, FL
Create a beautiful, fully customized ADU designed for family, guests, rental income, or independent living—all planned and built by Tampa’s experienced design-build team.
Custom Accessory Dwelling Units Designed Around Your Lifestyle
An accessory dwelling unit, or ADU, is a fully livable secondary structure built on the same property as a primary home. Often called a guest house, in-law suite, or backyard cottage, an ADU includes its own kitchen, bathroom, and living area, giving it everything it needs to function as a private, independent home, even though it shares your lot.
At Watermark Design Build, we design and build custom ADUs for homeowners across Tampa, FL, who want more from their property without leaving the neighborhood, school district, or community they already love. Every ADU we build starts with a conversation about how you actually live, because the best accessory dwelling units are designed around real life, not a one-size-fits-all floor plan.
What Type of ADU Is Right for You?
ADUs come in several forms, and part of our process is helping you choose the right one for your lot and your goals. A detached ADU stands on its own in the backyard, offering the most privacy and separation from the main house. An attached ADU connects directly to your existing home, sharing a wall while still functioning as its own living space. Many of our Tampa clients also choose a garage conversion, transforming an underused two- or three-car garage into a fully finished suite complete with a kitchen, bathroom, and comfortable living area. For homeowners with an existing pool, a pool house ADU adds a bathroom, kitchenette, and lounge space just steps from the water, perfect for entertaining or housing overnight guests. And for families who simply want a dedicated guest house, we design freestanding structures built to the same quality standard as the main residence.
More homeowners throughout the greater Tampa Bay area are building ADUs to support the way their families actually live. For some, that means multigenerational living: keeping aging parents close by in a private, single-level suite designed for comfort and accessibility, without sacrificing anyone’s independence. For others, it means giving an adult child a place to land while they save for a home of their own, or creating a guest house that welcomes visiting family throughout the year. And for many homeowners, an ADU is also a long-term investment: a separate rental unit that can generate steady income and help offset the cost of homeownership for years to come.
Whatever your reason for considering an ADU, our team manages the entire process from design through construction, so you end up with a space that looks, feels, and functions like a true extension of your home.
Why Build an ADU?
An ADU is one of the most flexible investments a Tampa homeowner can make. Here’s why our clients choose to build one:
Multigenerational Living
Keep loved ones close while maintaining privacy. A private suite lets parents, grandparents, or extended family stay nearby without sharing every square foot of daily life.
Rental Income
Generate long-term income from your property. A well-designed ADU can serve as a steady source of rental income, helping offset your mortgage or fund future projects.
Aging in Place
Create a comfortable, independent living space. Single-level layouts, wider doorways, and accessible bathrooms make it easier for aging parents to stay close to family.
Home Office
Separate work from home life. A quiet, dedicated ADU gives you a true escape from the main house, ideal for remote work, a studio, or a private retreat.
Guest Accommodations
Give visitors privacy and comfort. Out-of-town family and friends get their own space to settle into, instead of a shared guest room.
Increase Property Value
Add usable square footage and long-term value. A custom ADU expands your home's livable footprint and is one of the most impactful long-term investments you can make in your property.
Featured ADU Project
Ternpark Terrace
For the homeowners behind our Ternpark Terrace project, the goal was simple on the surface: build a guest house that would let an aging parent move in close to family. In practice, that meant designing a fully private, single-level ADU that could comfortably support multigenerational living, while still meeting strict HOA architectural guidelines for the neighborhood.
We worked closely with the homeowners and their HOA to design a structure that blends seamlessly with the style of the main residence, from the roofline to the exterior finishes, so it reads as a natural part of the property rather than a home addition. Inside, the unit was designed for everyday independence: a full kitchen, a private bedroom suite, and an accessible bathroom layout, all built to the same standard of craftsmanship as the rest of the home.
The result is a space the whole family uses with ease: private enough to give everyone room to breathe, and close enough to keep them connected.
What's Included in a Custom ADU?
Every ADU we build is fully custom, but most projects include:
- Custom floor plans designed around your lot
- Full kitchens with custom cabinetry
- Luxury bathrooms
- HVAC systems sized for the space
- Plumbing and electrical, fully permitted
- Premium finishes throughout
- Energy-efficient windows and doors
- Exterior finishes that match your home
- Smart home options
- Dedicated parking or access, where applicable
Quality Craftmanship. Clear Communication.
Why Homeowners Choose Watermark Design Build
When you’re adding a permanent structure to your property, who you build with matters. Tampa homeowners choose Watermark Design Build for our 20+ years of combined experience serving the greater Tampa Bay area, backed by a licensed Florida contractor (License #CBC1261697 | License #CPC1457546) and a full-service design-build approach that keeps every phase, from concept to completion, under one roof.
Beyond our credentials, what sets the experience apart is how we build. A dedicated project manager stays with your project from start to finish, communicating transparently along the way so you’re never left wondering what’s next. And because every design is truly custom, never a cookie-cutter floor plan, you can expect luxury craftsmanship, an eye for detail, and high-end finishes that match the quality of your existing home.
What Our Clients Say
Real feedback from Tampa homeowners who trusted us with their project.
“We have built 3 homes and done 6 major renovations on those homes, with Watermark being the largest and most recent of them all. While we have had mostly favorable experiences with all our contractors , Watermark has surpassed them all in quality and responsiveness.”
Ronald
“If you’re looking for the absolute best craftsmanship in the bay area, this is it. I would recommend this place to my Grandmother. Everything Jason touches turns out awesome. 10 steps ahead of any competition in Tampa Bay. Dont take my word for it, go check it out for yourself.”
J
“We are very glad that a friend recommended Watermark Design. They did an amazing job! They walked alongside us during the entire process beginning with style and design until the completed product.”
Jeffrey
ADU FAQ's
How much does an ADU cost in Tampa?
Costs vary widely depending on size, finish level, and site conditions such as utility connections and foundation type. Because every ADU we build is fully custom, the most accurate way to get a number for your property is a consultation, where we can talk through your goals and give you a realistic budget range based on your specific lot and vision. (Note for client: insert your typical starting price range here once finalized.)
Can I build an ADU in my backyard?
In many cases, yes. Whether you can build a detached ADU in your backyard depends on your lot size, setback requirements, and local zoning regulations, along with any HOA restrictions in your neighborhood. During our site evaluation, we review all of these factors and let you know exactly what’s possible on your property.
How long does ADU construction take?
In many cases, yes. Whether you can build a detached ADU in your backyard depends on your lot size, setback requirements, and local zoning regulations, along with any HOA restrictions in your neighborhood. During our site evaluation, we review all of these factors and let you know exactly what’s possible on your property.
Can I rent out my ADU?
Many homeowners build ADUs specifically to generate rental income. Whether long-term rental is allowed depends on local zoning rules and, in some cases, HOA restrictions, which we can help you navigate during the planning phase.
Do I need permits to build an ADU in Tampa?
Yes. ADUs require permits from your local building and zoning department, covering everything from structural plans to electrical and plumbing work. As your design-build partner, we manage the entire permitting process so you don’t have to navigate it on your own.
Can Watermark Design Build handle both the design and the permitting for my ADU?
Yes. As a full-service design-build firm, we manage every stage in-house, from initial design and engineering through permit submission and approval, so you have one team responsible for the entire project.
Is there a size limit for ADUs in Tampa?
Maximum square footage and lot coverage limits vary depending on your specific zoning district and lot size. We review these details with you during the site evaluation phase so your design fits within what’s allowed on your property.
Areas We Serve
We provide ADU design and construction services throughout Tampa and the surrounding Tampa Bay area. Whether you’re building a detached guest house in South Tampa, adding an in-law suite in Carrollwood, or converting a garage into a rental unit in Westchase, our team delivers exceptional design and craftsmanship tailored to your home. Our service area includes:
- Tampa
- South Tampa
- Westchase
- Lutz
- Brandon
- Temple Terrace
- Fish Hawk
- Carrollwood
- Odessa
- Valrico
- Apollo Beach
- Riverview
- Litha
- And the greater Tampa Bay area
Don’t see your neighborhood listed? Reach out, we likely serve your area too.
Location
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301 S Falkenburg Rd
Tampa, FL 33619 - M-F : 9AM - 5PM
Company
© 2026 Watermark Design Build Inc. | All Rights Reserved
License #CBC1261697 | License #CPC1457546