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Cover Home Additions & ADU: The Austin Owner’s Guide
If you own a Cover home in Austin and you’re planning an addition or an ADU, the installed cost typically lands between $45,000 and $130,000 for an addition, and $90,000 to $220,000 for a detached accessory dwelling unit. We work on Cover homes throughout Travis County, and we know the floor plans, rooflines, and foundation types that come with them. Most owners call us after they’ve outgrown the original footprint: a second kid, aging parents moving in, or a home office that can’t stay in the dining room anymore.
Here’s the thing about Cover homes specifically: they’re engineered around a precise structural grid. Additions and ADUs aren’t just about putting up walls. They’re about matching the existing roofline cleanly, tying into the original foundation without creating a crack line through your new drywall, and making sure the HVAC, electrical, and plumbing all extend without choking the existing systems. We’ve done this work in Mueller, Allandale, and up around the Domain, and the pattern is always the same: the people who get the best results are the ones who plan the connection points early, not after framing starts.
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Key Takeaways
- Full additions on Cover homes in Austin run $45,000 – $130,000 installed.
- Detached ADUs run $90,000 – $220,000 depending on size, utilities, and finish level.
- Permits and site prep are included in our written price, not billed as extras later.
- We match the Cover roofline and foundation tie-in so the addition doesn’t look like an afterthought.
- Every crew member is name-and-photo verified before they ever step on your property.
Which Cover Models This Applies To
Cover homes in Austin come in a few distinct plan families, and the addition strategy changes depending on which one you have. The single-story Cover models with gabled roofs are the most forgiving: the roofline lets you run a clean gable extension off the rear or side, and the crawl space or slab tie-in is straightforward. The two-story models are trickier, because the second-floor framing has to carry load down through the new walls, which means more engineering and usually a higher cost per square foot.
We stock and install aftermarket components that meet or exceed the original Cover specs: engineered lumber for the ridge beams, Simpson Strong-Tie connectors for the new-to-existing framing joints, and flashing that matches the original roof profile. OEM Cover structural components are available for some model years, but the lead time is often 6 to 10 weeks, and the price premium rarely buys you anything meaningful on an addition. For most Austin owners, quality aftermarket materials at the framing and connection points are the smarter spend.
One compatibility gotcha we see often: Cover homes built before 2018 typically use a 2×6 exterior wall assembly, while later models may use a 2×4 plus continuous insulation system. If your addition gets framed at the wrong depth, the wall intersections look and feel wrong, and the insulation envelope gets a thermal break right at the seam. We measure the existing wall depth before we ever order lumber.
Styles & brands we work with
Signs Your Cover Home Is Ready for an Addition (or Past Ready)
- The roofline is starting to show its age at the gable ends. When we see peeling fascia or water staining at the rake edges on a Cover home, it usually means the original trim wasn’t flashed well. That’s the most logical point to tie in a new roofline, because we’re cutting into that area anyway.
- You’ve got a “temporary” room that’s now permanent. A garage-turned-office, a sunroom that’s actually a bedroom, a covered patio that’s become a living room. These unpermitted conversions are common in Austin and they’re exactly what pushes people toward a proper addition on their Cover home.
- The HVAC struggles in one part of the house. Cover homes run efficiently, but the original systems are sized for the original square footage. When you’re already maxing out the air handler, an addition means running manual J load calculations and likely a second system or a ducted mini-split.
- Water pools near the foundation after rain. Austin’s clay soil expands and contracts hard. If you’re seeing persistent damp spots or foundation cracks on your Cover home, that’s a drainage and grading issue we have to solve before we pour any new slab or set any new footings.
- You’re out of wall space for clutter, not just out of rooms. This one sounds silly, but it’s the most common real trigger: an addition gives you storage, utility, and a mudroom, not just another bedroom. We hear it from families in Crestview and Brentwood all the time.
See the difference
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After
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AfterReplacement Cost & What’s Included
For a Cover home addition in Austin, you’re looking at $45,000 to $130,000 all-in, and an ADU runs $90,000 to $220,000. That includes the plans and structural engineering, the permit fees we pull with the City of Austin, site prep, foundation work, framing, roofing tie-in, rough and finish electrical, plumbing, drywall, paint, flooring, and the final walkthrough. The written price we give you before any work starts is the price you pay. No change orders for things we should have caught in the plan.
What drives the range is mostly size and what’s underneath the addition. A 400-square-foot bedroom-and-bath bump on a crawl space is at the lower end. A 900-square-foot primary suite with vaulted ceilings, a walk-in shower, and a new electrical subpanel is at the top. ADUs go higher because they need their own meter, sewer line, and often a new water service from the street. Austin Water and Austin Energy fees alone can run $8,000 to $15,000 on a detached unit.
Every addition and ADU we build on a Cover home is covered by our 365-Day Done Right Promise. If something isn’t right within a year of completion, we come back and make it right at no charge. That’s not a marketing line. It’s in the written guarantee we hand you before day one.
| Scope | Typical Austin Range | Notes |
|---|---|---|
| Single-room bump-out (200 – 350 sq ft) | $45,000 – $75,000 | Foundation, framing, roof tie-in, finish |
| Primary suite addition (400 – 600 sq ft) | $75,000 – $110,000 | Bath, walk-in closet, often vaulted ceiling |
| Two-story addition (500 – 800 sq ft) | $95,000 – $130,000 | Engineering and structural load transfer add cost |
| Garage conversion to living space | $30,000 – $80,000 | No foundation work, but full insulation + HVAC + permits |
| Detached ADU (studio – 1BR) | $90,000 – $150,000 | Separate meter, sewer tap, water line |
| Detached ADU (2BR, full kitchen and bath) | $160,000 – $220,000 | Larger footprint, higher finish level |
DIY or Call Us?
For an addition or ADU on a Cover home, there is no honest DIY version. This is structural work. You’re cutting into a load-bearing wall, tying into an engineered roof, and pouring concrete that has to meet City of Austin code. Get any of it wrong and you’re not looking at a $300 fix. You’re looking at a failed inspection, a stop-work order, and likely a repair that costs more than hiring it out right the first time.
What you can safely do before calling us: measure your lot lines and setbacks, pull your original Cover floor plan if you kept it, and make a rough sketch of what you want. That’s genuinely helpful. What you shouldn’t do: take a saw to any exterior wall, dig any post holes, or run any electrical. Austin soil moves, and Cover’s framing is tighter than most production builds. As Isaac Pruett says, “Tell me what’s wrong with it. We’ll figure out what it actually needs.”
Call (903) 623-1966 and we’ll walk the property with you, look at your Cover home’s existing systems, and give you a written price before anything gets touched.
FAQs
Most additions run 10 to 16 weeks from permit approval to final walkthrough, and ADUs typically run 5 to 8 months because of the separate utility connections and Austin Energy and Austin Water timelines. The city’s permitting backlog is real, and we factor that into the schedule we give you before we start. Call (903) 623-1966 and we can look at your specific scope and give you a firmer timeline.
Yes, and sometimes that’s the right call. If the issue is layout or flow, a remodel of the existing footprint costs significantly less than an addition and avoids the foundation and roof work entirely. If you’re genuinely out of square footage, no remodel fixes that. We’ll tell you straight which one you need before any work begins.
We carry and source everything. Engineered lumber, connectors, flashing, windows, roofing, and the interior finishes all come through our supplier network. That includes specification-grade partners like KraftMaid, Cambria, and Silestone if you’re finishing a kitchen or bath as part of the addition. Nothing gets ordered until you’ve approved the written line-item price.
Only if you change the scope. The written price we give you before work starts is what you pay at the end, and we stand behind that on every Cover addition and ADU we build in Austin. Change orders happen only when you ask for something different, and they’re written and approved before that work starts. Call (903) 623-1966 for a free estimate, and you’ll see exactly what I mean.
Written by Isaac Pruett, Owner, Mason Remodeling Co Austin at Mason Remodeling Co Austin, serving Austin and nearby areas.
