Custom ADU Builds, Backyard Guest Houses & In-Law Suites: Engineered Like a True Custom Home.
Building an Accessory Dwelling Unit isn’t dropping a glorified shed in the backyard. It’s building a permanent, self-contained home on your property. At Level 5 Builders, we coordinate the process from zoning feasibility and utility planning to framing and finish work, backed by a clearly defined scope and budget.
Proudly serving homeowners across Alpharetta, Roswell, Milton, Johns Creek, Marietta, Kennesaw, Decatur, Fayetteville, and Peachtree City.
Why an ADU Requires a True Structural Builder, Not Just a Shed Kit
Whether you are bringing aging parents closer to home, creating a private suite for a returning college graduate, or planning a backyard guest cottage, an ADU can offer valuable flexibility when the property, approvals, and design are a good fit.
The internet is full of ads promising inexpensive drop-in backyard pods. But the structure itself is only part of the project. The work also happens in the dirt, the municipal zoning office, and the utility trenches.
How will wastewater reach an approved sewer or septic connection if the backyard sits below the existing drain? Does your electrical service have the capacity for another kitchen, laundry, and HVAC system? What do setbacks, lot coverage, drainage, easements, and local use restrictions allow?
At Level 5 Builders, our name comes from the highest standard of precision finish work in the construction trade. For over 25 years, we’ve helped Georgia homeowners solve structural and site challenges. We plan the important details up front instead of leaving you guessing about permits or site costs.
From the Trench to the Roofline: What We Handle for You
When you hire Level 5 Builders for an ADU or multi-generational suite, you aren’t left coordinating separate trades and figuring out utilities alone. We manage the agreed construction scope, with qualified design and engineering professionals where required.
Zoning, Setbacks & Lot Coverage Review: Before you invest in a full set of architectural drawings, we review available surveys, parcel zoning, setbacks, lot coverage, drainage, easements, and septic or sewer information. We identify questions for the local planning office and any HOA. Final permission depends on the applicable authorities and approvals, not just an initial walkthrough.
Utility Trenching & Tie-Ins: An independent dwelling needs appropriate water, wastewater, and electrical service. We coordinate utility routes, required trenching, drainage or pumping solutions, and electrical capacity. Sub-panels, separate metering, and independent mini-split or heat-pump HVAC systems are evaluated for the proposed design and utility-provider requirements.
Permanent Foundations & Structural Framing: The foundation is selected for the site, soil conditions, and approved plans. Slabs, crawlspaces, or other permitted foundation systems support properly sized framing, roof assemblies, and specified structural connectors, including Simpson Strong-Tie® hardware where appropriate.
Architectural Matching: Your ADU should feel like it belongs. We plan roof pitch, exterior finishes, window profiles, and trim around your main home. James Hardie® fiber-cement siding, brick or stone accents, and Pella® windows are options within the agreed material plan.
Aging-in-Place Design: For an in-law suite, we can plan wider doorways with usable clear openings, step-free access where site conditions allow, maneuvering space, grab-bar blocking, and curbless showers with a specified waterproofing system. Accessibility depends on the complete layout and individual needs, not the nominal door size alone.
What Does It Really Cost to Build an ADU or In-Law Suite?
An ADU combines a kitchen, bathroom, HVAC, water heating, electrical service, and insulation in a compact footprint. Site work and utility connections can be a substantial part of the budget, so a simple per-square-foot comparison rarely tells the full story.
These are Level 5 Builders’ planning ranges for the scopes below, not fixed quotes or independently verified market averages. Final pricing depends on size, existing conditions, access, utility capacity, required approvals, and selections. Build timelines are estimates after design, approvals, and material readiness; permitting and utility-provider work can add time.
Garage, Basement, or Above-Garage ADU Conversion
Investment Range: $85,000 – $140,000
Typical Build Timeline: 8 – 12 Weeks
Scope: Reusing an existing shell where structurally suitable; a private entrance; plumbing for a waterproofed bathroom and kitchenette or kitchen; appropriately sized HVAC; sound-control details; electrical upgrades where required; and a Level 5 interior finish. Structural capacity, ceiling heights, egress, and local dwelling rules must be checked before a conversion is confirmed.
Attached In-Law Suite / Primary Wing Addition
Investment Range: $135,000 – $210,000
Typical Build Timeline: 12 – 16 Weeks
Scope: A new foundation and framed addition; bedroom and living area; bathroom with agreed accessibility features; kitchenette where permitted; roofline and exterior-finish integration; and utility connections subject to existing system capacity and approved plans.
Detached Backyard ADU / Guest Cottage
Investment Range: $175,000 – $285,000+
Typical Build Timeline: 16 – 24 Weeks
Scope: A new standalone dwelling, often planned around 500 to 1,000+ square feet where allowed; grading and excavation; a site-appropriate foundation; utility connections; roofing, siding, and windows; kitchen, laundry, bathroom, and bedroom; and required inspections through the applicable final occupancy approval.
A Defined Budget Only You Can Exceed: We document the scope, material selections, allowances, and known site work before construction. Optional upgrades and added scope require your approval. Your written proposal and contract define inclusions, exclusions, and how unforeseen conditions or authority-required changes are handled.
How We Manage a Backyard Build with Respect for Your Home
Building in an existing backyard takes careful planning and respect for your property and neighbors. Our process connects feasibility, design, approvals, and construction instead of treating them as unrelated tasks.
On-Site Feasibility Walkthrough: We walk the lot with you, assess equipment access and visible site conditions, locate accessible electrical and plumbing connection points, and discuss layout options. Surveys, utility records, specialist evaluations, or municipal clarification may be needed before feasibility is confirmed.
Design, Engineering, Permitting & Scope Definition: Whether you have architectural drawings or need help coordinating the design process, we develop the agreed scope, structural approach, material plan, and budget. Required licensed professionals and city or county approvals are coordinated before work proceeds.
Dedicated Project Management: Your Level 5 Project Manager coordinates excavation, trades, rough-in inspections, cabinets, and final trim. We plan access routes, material staging, protection, and cleanup, and communicate schedule changes when weather, inspections, or supply conditions affect the build.
Frequently Asked Questions About Building an ADU
How do I know if my city or county allows a detached backyard ADU on my lot?
Rules depend on the exact parcel, zoning district, proposed use, and local authority. A detached dwelling, non-rental guest house, and attached in-law suite may be treated differently. We review zoning, setbacks, coverage, utilities, and any HOA restrictions, then coordinate questions with the planning office. An initial consultation can identify the next steps, but it does not guarantee immediate approval or rental eligibility.
Can an ADU connect to my existing septic tank, or do I need sewer?
An existing sewer or septic connection must be evaluated for the additional dwelling and wastewater demand. Sewer routes, grades, capacity, and any pumping solution need an approved design. For septic properties, we coordinate review of permitted capacity, soil and drain-field conditions, and replacement-area requirements with the local Environmental Health office and qualified specialists. Do not assume the existing tank can simply accept another home.
Is an attached in-law suite or conversion cheaper than a detached cottage?
Reusing a suitable garage or basement, or locating an addition near existing utilities, may reduce some costs. But structural upgrades, drainage, fire separation, access, and utility capacity can change the comparison. We prepare property-specific options rather than promise a universal 20% to 30% saving. A detached unit can offer more privacy; resale value and rental potential depend on local rules and the market, not a guaranteed return.
Thinking About an ADU or In-Law Suite? Let’s Walk Your Property First.
Before you invest in a complete set of blueprints, let’s talk through your lot, utilities, budget, and vision. We’ll explain the practical next steps and what needs to be verified so you can make an informed decision about building it right.
