What a new detached ADU in McGregor actually costs and how long it takes
A new detached ADU in McGregor typically runs between $90,000 and $220,000, with most projects landing in the $140k-$170k range for a standard one-bedroom, one-bath unit with a kitchenette. From the day we break ground, a straightforward build on a clear lot takes roughly 16 to 22 weeks, though McGregor’s permitting timeline adds four to eight weeks on the front end. Call us at (844) 638-7249 for a free on-site estimate and a written scope-of-work breakdown specific to your property.
How we build a detached ADU from bare dirt to finished space
1. Site evaluation and permit submission (Weeks 1-6, mostly waiting on the county)
We start with a lot survey, soil compaction test, and a FEMA flood-zone check. McGregor’s high water table means we pull a geotechnical report almost every time, and if your property sits near the Caloosahatchee River or within the special flood hazard area, we calculate freeboard and stem-wall height before anything gets drawn. The plans go to Lee County Building & Permitting, and that queue is still backed up from the post-Ian rebuild surge. We handle the submittals, the corrections cycle, and any root-zone encroachment sign-off required by Lee County Urban Forestry if you’re within the protected palm canopy zone along McGregor Boulevard. You decide: foundation type (slab-on-grade vs. stem-wall), unit footprint, and window/door placement.
2. Foundation, underground rough-ins, and slab pour (Days 1-12 on site)
Once permits clear, we clear and grade the pad, trench for water, sewer, and electric laterals, and form the foundation. Because McGregor’s wet-season groundwater sits just 18 to 24 inches down, we often over-excavate and import select fill to keep the slab stable long-term. Underground plumbing gets inspected by the county before we pour. You decide: final ADU elevation relative to grade, which affects step-up height and any ADA-type access preferences.
3. Framing, sheathing, and dry-in (Weeks 3-6 on site)
The shell goes up fast: wall framing, roof trusses or stick-built rafters, OSB sheathing, and housewrap. Roofing goes on immediately after, followed by impact-rated windows and an exterior door. In this part of McGregor, every opening product has to meet current Florida Building Code wind-load requirements, so we spec windows and doors rated for the high-velocity hurricane zone. Walls get strapped per code, with continuous load-path hardware from roof to foundation. You decide: siding material (cement board lap, stucco, or engineered wood), roof pitch, and any dormer or covered-porch add-ons.
4. Interior rough-ins, insulation, and drywall (Weeks 6-10 on site)
Electricians pull wire, plumbers set the water lines and waste stacks, and the HVAC crew runs ductwork or mounts the mini-split. Insulation goes in - batts in the walls, blown-in or rigid board depending on the roof assembly - and then the drywall hangs, tapes, and textures. This is the stage where most homeowners start thinking about tile, flooring, and trim details if they haven’t already. You decide: HVAC type (mini-split vs. small central system), interior wall finish level, and any low-voltage wiring for data or security cameras.
5. Finishes, fixtures, and final inspections (Weeks 10-16 on site)
Flooring, cabinetry, countertops, paint, plumbing trim, light fixtures, and baseboards all go in. The kitchenette - typically a compact layout with a sink, under-counter fridge, two-burner cooktop or just a microwave - gets finished out with backsplash tile if you’ve chosen to pair this with a Backsplash, Tile & Flooring in McGregor scope. Lee County does a final building inspection, a separate electrical inspection, and sometimes a fire marshal sign-off depending on ADU size. Once we pass, the CO gets issued and the space is yours. You decide: cabinet door style, countertop material, flooring type, and paint colors.
The choices that shape your ADU
Most detached ADUs in McGregor fall into one of three configurations, and the decisions you make early steer the entire budget:
- Studio layout vs. one-bedroom with a wall. An open studio is the most affordable shell to build, but adding a framed interior wall and a closet changes the resale math - most buyers searching McGregor properties treat a true one-bedroom ADU as a separate rentable unit, not just bonus space. The wall adds $3,000-$6,000 depending on whether it carries plumbing for a kitchenette on the opposite side.
- Kitchenette or full kitchen. A wet bar with a sink, under-counter fridge, and microwave is standard. Going to a full kitchen with a range, hood, and 220V line adds $8,000-$14,000 and triggers a second round of mechanical permit review. If the ADU is for a family member who cooks, it’s worth it. If it’s a guest suite, the kitchenette usually feels right.
- Mini-split HVAC vs. tying into the main house system. A ductless mini-split costs $3,500-$6,000 installed and gives the ADU independent temperature control. Extending ductwork from the existing central system can work if the main unit has enough capacity, but most McGregor homes built in the 1950s-1970s already run near their limit. We’ll check the Manual J load calc before recommending either path.
- Impact windows and doors. Non-negotiable under current Florida Building Code, but you do choose between aluminum frame and vinyl frame, single-hung or casement operation, and clear vs. Low-E glass. The price spread on a small ADU is roughly $1,800-$4,000 depending on brand and glass package.
- Siding and trim durability. James Hardie cement board lap siding costs more upfront than vinyl but holds paint longer and handles McGregor’s humid, salt-adjacent air without warping. Stucco on block is the original McGregor vernacular and costs roughly the same as cement board once scratch-and-brown coat labor is factored in. We talk through the maintenance horizon on each.
What a new detached ADU costs in McGregor, FL
The lead range for a new detached ADU in McGregor is $90,000-$220,000. A compact studio with a bathroom and kitchenette on a clear, flat lot starts near the low end. A larger one-bedroom with a full kitchen, impact-rated everything, higher-end finishes, and tricky site prep pushes toward the high end.
What moves the number:
- Foundation complexity. A simple slab-on-grade on dry, compacted soil is the baseline. If we hit muck, need to over-excavate due to the water table, or pour a raised stem-wall for flood compliance, foundation cost can double.
- Utility trenching distance. Running water, sewer, and electric laterals 20 feet from the main house is one thing. Running them 120 feet across a McGregor lot with mature tree roots adds material, trench depth, and restoration labor.
- Interior finish grade. Stock cabinets, laminate countertops, and basic porcelain tile keep finishes affordable. KraftMaid semi-custom cabinets, quartz counters, and wood-look LVP flooring add $12,000-$20,000 to the finish budget for a small unit.
- Permit and impact-fee exposure. Lee County impact fees, school impact fees, and the post-Ian permit surcharge environment mean soft costs on a detached ADU here often land between $6,000 and $12,000 before a shovel hits dirt. Our written estimate line-items these separately so you see exactly where the money goes.
- Site access and tree protection. If your lot is tight, fenced, or has protected palms near the build footprint, we factor in hand-digging root zones, tree-protection fencing, and shorter equipment reach - all of which add labor hours but keep you compliant with county forestry rules.
Every estimate we write includes a fixed-price scope, a line-item breakdown, and a clear statement of what’s covered and what isn’t. No change-order games. We do not mark up materials mid-job. Call (844) 638-7249 and we’ll walk the site and hand you a number you can actually plan around.
What McGregor properties specifically do to an ADU project
McGregor is not a standard suburban market. Hurricane Ian’s 2022 storm surge and wind damage hit this corridor hard, and the rebuilding wave that followed has not fully receded. Lee County’s permitting department is still processing elevated case volumes, so a detached ADU here carries a longer paper-trail runway than the same project would in a drier inland zip code. Nearly every project we touch in this area requires a flood-zone determination, and many of the 1950s-era CBS ranch homes along streets like Riverside Drive or Cortez Boulevard sit on lots where the existing electric service panel needs an upgrade before it can legally feed a second dwelling - 100-amp panels are still common in the older McGregor housing stock, and 200-amp service is the practical minimum for a detached ADU with its own HVAC and kitchen load.
The site-prep reality is different here, too. The water table hovers within two feet of grade during wet season, so trenching for sewer laterals means dealing with groundwater and sometimes pumping during the excavation. Where the historic royal palm canopy runs, we coordinate root-zone protection plans with Lee County Urban Forestry before permits even get submitted. Contractors who do not work McGregor regularly get surprised by that step and lose weeks. We expect it and build it into the schedule from day one. The silver lining: the same mid-century lots that make site work tricky also tend to be deep and wide, which means setback-to-setback fit for a detached ADU is rarely the constraint it would be on a newer zero-lot-line subdivision farther east.
Serving McGregor, FL - Our Local Coverage Area
We’re based in the McGregor area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently asked - New Detached ADU in McGregor
Plan on five to seven months total. Lee County plan review and permit issuance currently takes four to eight weeks, and construction itself runs 16 to 22 weeks for a standard unit. Site-prep complexity, weather during wet season, and any root-zone coordination with county forestry can each add a week or two. We build a milestone schedule into every contract so you can track progress against specific dates.
Yes, absolutely. Lee County requires a full building permit, separate electrical and plumbing permits, a flood-zone review, and often a tree-protection sign-off if the ADU footprint is near a protected palm or oak. We pull every permit under Groundwork Construction’s license and carry the inspection logistics from rough-in to final CO. If you’re part of a full Home Additions & ADU in McGregor scope that includes main-house work, we bundle the permits to reduce repeated plan-review fees.
You cannot eliminate plumbing - a detached ADU needs its own water supply and sewer connection - but you can minimize trenching cost by placing the ADU as close to the main house’s existing lateral lines as the lot allows. Every foot of separation adds material and excavation cost. We’ll walk you through the trade-off between ideal placement and utility budget during the site evaluation, and the estimate will show both options so you choose with eyes open.
In McGregor, expect $90,000-$220,000 turn-key. A studio with a bathroom and kitchenette starts near the bottom of that range. Adding a bedroom wall, full kitchen, and higher-end finishes moves it into the $140,000-$170,000 band most homeowners end up in. Soft costs like impact fees, survey, and permit charges are included as separate line items in our written estimate. Call (844) 638-7249 and we will bring a tape measure, a notepad, and a calculator, not a sales pitch.
Every ADU we build is covered by our 730-Day Done Right Promise: if it’s not done right, we make it right. That applies to framing, roofing, siding, windows, drywall, paint, flooring, plumbing, and electrical - the entire scope. Material warranties from manufacturers like Andersen or James Hardie run separately and typically extend well beyond the workmanship coverage. We hand you every manufacturer warranty certificate at final walkthrough.
Get a free on-site estimate for your McGregor ADU
A new detached ADU is a six-figure investment, and you should see a real number before you decide whether to move forward. Call us at (844) 638-7249 and we will schedule a site visit within the week. Derek Hollenbeck or one of our senior project leads will walk the lot with you, take measurements, talk through the options that make sense for your property, and send you a written, line-item estimate at no charge. No pressure, no deposit asked upfront, just straight answers from a home additions & adu crew that works McGregor every week. Homeowners often pair an ADU with a Kitchen Design & Layout in McGregor scope on the main house at the same time - we can price both so you see the combined cost and timeline.
Written by Derek Hollenbeck, Owner at Groundwork Construction Co., building detached ADUs in McGregor with fixed pricing and a 730-Day Done Right Promise.