Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Dickinson
Adding square footage in Dickinson, TX rarely starts with a nail gun. It starts with a flood-elevation analysis, a septic setback check, and a conversation about how black-clay soil behaves under a late-summer dry spell. Most home additions and ADU projects in Dickinson run between $45,000 and $130,000, with detached ADUs generally landing in the $90,000 to $220,000 range once site prep, utilities, and county elevation requirements are factored in. We’ve been building in this part of Galveston County long enough to know that the right first step is a scope of work on paper, not a verbal promise over the fence. Call (877) 610-1318 and Tom or one of his sons will talk you through what’s actually involved on your lot.
Why Barrett & Sons Construction Is Dickinson’s Preferred Home Additions & ADU Company
We’re an owner-operated outfit founded in 1998. Tom Barrett runs the crews with his sons, and the name on the truck is the name that signs the contract. Dickinson homeowners call us because they’ve already been through the song and dance with a national company that quoted one number on the phone and handed them a different bill at the door. That doesn’t happen here. Every allowance, every scope change, every price adjustment arrives as a written change order before anyone swings a hammer.
Working in Dickinson means understanding what Harvey did to this city. A large share of the housing stock in 77539 either flooded, got elevated, or was torn down to the slab and rebuilt. That history shapes every addition and ADU we scope here. We know what a FEMA Substantial Damage determination means for your elevation certificate. We know when Galveston County freeboard rules kick in and how they affect the foundation design on a detached ADU off Pine Drive or a garage conversion near the Bayou. That local fluency isn’t something you can phone in from a call center.
Our Home Additions & ADU team carries the same standards across every trade: permits pulled, inspections signed, premium materials from brands you can verify, and the written 90-Day Done Right Promise on every contract. If something isn’t done right, one call brings Tom back. No fine print. No runaround.
Our Home Additions & ADU Services in Dickinson
ADU Site Prep & Utilities
On acreage lots around Dickinson, site prep is where the real cost lives. Before we quote a detached ADU, we walk the property to locate the septic drain field, check the existing elevation certificate, and run a soil probe to see what the black clay is doing at depth. In Dickinson, that rarely looks like a flat, predictable slab pour. It looks like pier footings engineered for expansive soil, flood-vented skirting, and water lines routed above the county’s required drainage elevation. We scope all of it before the first dollar is committed.
New Detached ADU
A new detached ADU on a Dickinson lot is a different animal than an attached addition. You’re dealing with county permitting, setbacks from septic and well lines, and a freeboard requirement that can push the finished floor elevation a foot higher than you expected. We’ve built them on lots near Dickinson Bayou and along the stretch of 44th Street where post-Harvey elevation work happened block by block. The design work is straightforward. The site work is where experience pays.
Garage Conversion ADU
Converting an attached or detached garage into living space in Dickinson often looks like the cheapest route, and sometimes it is. Garage conversions typically run $30,000 to $80,000 in this market. But the hidden line items here are the same ones that bite on new builds: flood elevation compliance, sewer tap constraints, and whether the original slab sits below current Base Flood Elevation. If it does, you’re not getting a simple interior buildout. You’re getting a stem-wall extension or a pier retrofit, and that needs to be on paper before demolition starts.
Junior ADU & Interior Conversion
A junior ADU inside an existing home, often a converted bedroom wing or a finished-out attached garage bay, can be the fastest path to rental income or a multigenerational layout. In Dickinson’s 1960s to 1990s ranch-style housing stock, we frequently see large interior footprints that subdivide cleanly. The county still cares about the same things on these jobs: septic capacity, flood elevation, and whether the existing electrical panel can carry the new load. We pull permits on every one of them. The permit inspector works for you, not for me, and that’s the way I like it.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Dickinson
We install materials you can look up, not mystery brands off a van. For windows and doors on Dickinson additions and ADUs, we regularly run Simonton, Ply Gem, and PGT products, all of which hold up under Gulf Coast humidity and hurricane-driven wind loads better than bargain alternatives. If a client wants impact-rated glazing on a sunroom or a new primary suite facing Galveston Bay, PGT is our go-to. We stock common trim profiles and hardware locally so a mid-project material run to a Dickinson job site doesn’t stall framing for three days while someone orders from a warehouse in another state.
Common Home Additions & ADU Problems We See in Dickinson Homes
- Slabs poured at pre-Harvey elevation. Original slab-on-grade ranch homes in Dickinson often sit a foot or more below current Base Flood Elevation. Any addition tied to that slab inherits the elevation problem, and solving it usually means stem walls, flood-vented skirting, or a full pier-and-beam redesign.
- Septic setback surprises. On acreage lots, an existing septic drain field can sit exactly where the ADU needs to go. Running a water line before confirming the setback typically ends with a variance hearing or a mandate to install an aerobic system that costs $8,000 or more.
- Black-clay soil movement. The expansive clays along the Texas coast shrink in dry summers and heave after heavy rain. We see homes off Highway 3 and toward Bacliff with perimeter beams that have cracked from seasonal movement, and every new foundation scope in Dickinson has to account for that cycle.
- Post-Harvey flood-insurance implications. A sunroom or enclosed patio graded at the original slab height on a Harvey-flooded lot can spike future flood-insurance premiums even if the county inspector signs the final inspection. We raise these issues before you sign anything.
Pricing for Home Additions & ADU in Dickinson, TX
Home additions in Dickinson typically run $45,000 to $130,000, and detached ADU construction generally lands between $90,000 and $220,000. Garage conversions sit in a tighter band, usually $30,000 to $80,000. What moves the number on your lot is rarely the framing cost. It’s the site work: elevation corrections, septic and well setbacks, grading on an open lot, material haul access, and soil engineering. That’s why we don’t quote Dickinson jobs over the phone based on square footage alone. We walk the property, check the elevation certificate, probe the soil, and then hand you a written scope with allowances in writing and change orders in writing. Call (877) 610-1318 to schedule your free estimate. No trip charge inside the county.
| Project Type | Typical Dickinson Range |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
We Also Serve Cities Near Dickinson
While this page is written for homeowners in Dickinson and the 77539 zip code, our crews also run jobs in Bacliff, League City, Seabrook, and Webster. The county rules don’t change much across that stretch of Galveston County, but the lots and the flood history do, and we scope each one on its own terms. If you’re on the edge of Dickinson or just across the bayou, give us a call and we’ll let you know when we can get eyes on the property.
Serving Dickinson, TX - Our Local Coverage Area
We’re based in the Dickinson area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Dickinson
Yes. Galveston County does not waive structural or flood-elevation permits based on a 200-square-foot threshold, and in Dickinson, any structure with living space triggers the freeboard and septic setback review regardless of size. A storage shed and an ADU are treated differently the moment plumbing or sleeping quarters enter the scope. Call (877) 610-1318 and we’ll tell you exactly what the county will ask for on your specific lot, free of charge.
In most cases, yes, and a second-story addition is often the smartest way to add space in Dickinson without touching the original slab. The county’s concern is the finished floor elevation of new living space, so a second story that sits above current freeboard can frequently proceed without a full foundation retrofit. What it will require is an engineer’s evaluation of the existing framing, because post-Harvey gut renovations revealed plenty of hidden damage that never made it into the original claim. We scope all of it before quoting.
The expansive clay soils common across Dickinson shrink during dry summers and heave after sustained rain, which means a standard monolithic slab is rarely the right answer for a detached ADU on acreage. We typically specify pier footings drilled below the active clay zone, with grade beams engineered for seasonal movement. That adds real cost to the foundation line item, often several thousand dollars on a standard ADU footprint, and any honest Dickinson quote should reflect it. Ours does. Call (877) 610-1318 for a site walk and a written number.
Sometimes, but in Dickinson it depends on your existing septic system’s rated capacity and the drain field setback from the garage structure. If the current tank and field were sized only for the original house, the county may require an upgraded system or a separate tap. We’ve handled garage conversions near Dickinson Bayou where the septic constraint drove more of the budget than the framing did. The answer is knowable before you spend a dollar, and we’ll find it for you.
The county inspector may sign the final inspection on a sunroom that sits below freeboard, because a sunroom isn’t always classified as habitable space. But your flood-insurance carrier sees it differently, and a below-freeboard addition can trigger a premium spike or a coverage gap on the rebuilt structure. On a Harvey-flooded lot in Dickinson, that’s a real financial exposure. We’ll flag it before you sign anything, and if you want the sunroom at elevation, we’ll scope the stem-wall extension to get it there. Call (877) 610-1318 and we’ll walk the property with you.
We serve Dickinson regularly and can typically get eyes on your property within a few business days. Calls are answered by a live person 24/7, and Tom or one of his sons will be the one who shows up. There’s no trip charge inside the county. Call (877) 610-1318 to set a time.
Yes. The 90-Day Done Right Promise is written on every contract, including every addition and ADU we build in Dickinson and the surrounding county. If something isn’t done right, one call brings Tom back to make it right. That’s the whole promise, and it doesn’t change at the county line.
Written by Tom Barrett, Owner at Barrett & Sons Construction, a family-owned builder serving Dickinson and the surrounding Galveston County communities since 1998.