Central Florida ADU Floor Plans, Cost Calculator & Code Guide

Central Florida ADU Floor Plans, Cost Calculator & Code Guide

Accessory Dwelling Units (ADUs) • Granny Suites • Senior Cottages • Backyard Rental Homes
Designed & Built to Florida Building Code for Central Florida Homes

Start My ADU Cost & Feasibility Check
See Floor Plans & 3D Designs

Licensed Florida General Contractor — CGC1528896
Serving Orlando, Orange, Volusia, Seminole, Lake, Osceola, Polk & Brevard

Modern backyard guesthouse with open living space
Who We Build ADU's For

We design and build real, code-compliant Accessory Dwelling Units (ADUs) for:

Families

Families needing space for parents or adult children

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Rental Income

Homeowners adding rental
income

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Seniors

Seniors wanting to age in place near family

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Floor Plans & 3D Designs
We offer concept floor plans between 400–1,000+ sq ft, customized for how you plan to use your ADU.

600 sq ft ADU

1 Bed • 1 Bath • Ideal for rental or family use

Estimate This Plan

600 sq ft ADU

1 Bed • 1 Bath • Ideal for rental or family use

Estimate This Plan

600 sq ft ADU

1 Bed • 1 Bath • Ideal for rental or family use

Estimate This Plan

ADU Cost & ROI Calculator

Central Florida · Design-build · Concept to CO

Plan your ADU.
See the possibilities.

Explore the build budget, monthly financing, and rental outlook for your next space. Start with your ideas. Refine the numbers with GL Lewis.

01

Your future space

Choose the starting point for your project.

Project type

Location is recorded for your review; local fees and zoning are not calculated automatically.

Design preference; no separate price adjustment.
Layout preference within the selected area.
One included; extra bathrooms use an editable allowance.
Finish level
02

The site & the details

Account for conditions beyond the floor plan.

The allowance covers extra site work, standard connections and preconstruction.

Optional scope

Example allowances. Select an item to edit its amount.

+$20,000
+$6,500
+$12,000
+$8,000
+$10,000
Adjust pricing assumptions

Starting rates of $230 / $255 / $285 per sq. ft. and site allowances of 15% / 25% / 35% come from the existing GLL calculator. Their scope still needs owner review. Other defaults below are illustrative planning assumptions, not vendor or lender quotes.

Draft: detached 1.00, attached 0.95, conversion 0.80.
Unconfirmed. Zero is not a fee-waiver determination.
Scenario spread, not a statistical confidence interval.

The site/preconstruction allowance is allocated 40% extra site work, 25% utilities, 20% design/engineering, 5% survey, and 10% permits. These are draft budget allocations. Impact fees are separate. Confirm inclusions to avoid overlap with a contractor quote.

Planning estimate only. Land, unusual soil or flood conditions, off-site improvements, furnishings and unentered fees are excluded. Property review determines feasibility, scope and final pricing.

GL Lewis ADU Planning Estimate

Request an ADU Property Review

Frequently Asked Questions

Yes. ADUs are allowed in many Central Florida cities and counties, but rules vary by jurisdiction. Zoning, lot size, setbacks, parking, and occupancy requirements must be verified for your specific property.
Most professionally built, code-compliant ADUs in Central Florida fall into a broad range depending on size, finish level, and site conditions. The ADU Cost & ROI Calculator on this page provides a realistic ballpark estimate based on your inputs.
Yes. ADUs are permanent structures and require building permits, plan review, inspections, and certificates of occupancy, just like a primary home.

Ready to See If an ADU Works on Your Property?

Get a clear next step for your property, budget, and goals — no pressure, just real numbers and code guidance.

Request an ADU Property Review