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Tamko Home Additions & ADU: The Houston Owner’s Guide
Tamko home additions and ADU projects in Houston typically run $45,000 to $130,000 when built through a general contractor like Elmstead Remodeling Houston, and most projects take 3 to 6 months from permit to final walkthrough. We work with Tamko roofing and building products on these projects when the existing home has a Tamko roof or when the homeowner wants matched exterior materials across the new space. The most common way Houston homeowners come to us is mid-planning: they have a Tamko roof on the main house, they are adding a primary suite or a garage apartment, and they want the roofline, the flashing details, and the underlayment on the addition to match what is already keeping their family dry.
Before we get into costs and compatibility, one thing worth saying plainly: we are an independent Houston remodeling contractor, not a Tamko dealer or distributor. That independence means we recommend the Tamko product when it is the right fit for the addition, and we say so when a different system makes more sense for the specific roofline or budget.
Which Tamko Models This Applies To
Tamko’s residential roofing line splits into three families: the Heritage shingle series, the Titan XT series, and the StormShield or TW metal roofing lines, depending on the year the original roof was installed. A Houston addition with a low-slope section over a patio or a carport will often call for Tamko’s self-adhered underlayment products rather than shingles alone, and that is where we see the most compatibility mistakes from homeowners who have tried to plan the addition themselves.
The identification step is straightforward. Walk to the garage or the original permit paperwork from when the roof was installed, and look for the Tamko product label on any leftover bundle or the paperwork itself. The shingle name and color code are printed right on the wrapper. If the original roof is older than about eight years in Houston’s sun and humidity, the color will have faded slightly, and a fresh bundle of the same named color will not blend perfectly. We tell every Houston homeowner the same thing during planning: if the addition will be visible from the street, plan for a full reroof of the main house at the same time, because a visible color mismatch is the most common disappointment we see on matched exterior projects. If the addition sits behind the house or above a garage, we can often source a close match and keep the existing roof in place.
For the underlayment and flashing details, we stock Tamko’s self-adhered products on the project trailer, and we use them on every valley, penetration, and low-slope section where the addition meets the original house. The transition between old roof and new roof is where Houston wind-driven rain finds its way in, and the spec on that transition matters more than the shingle itself.
Styles & brands we work with
Signs Your Tamko Home Additions & ADU Is Failing
This section is for homeowners who already have a Tamko addition or ADU and are seeing problems. When we walk a Houston property with a failing addition roof or exterior, here is what we actually find:
- Water staining on the ceiling where the addition meets the main house. This is almost always a failed transition flashing or deteriorated underlayment at the seam between the old roof plane and the new one. The shingles on both sides can look fine while the joint underneath leaks.
- Granule loss in the gutters around the addition only. Houston’s rain moves granules, but when the gutters on the addition are collecting noticeably more granules than the main house, the addition roof was likely installed with a different batch or a mismatched product line that is aging faster.
- Curling shingle edges on south-facing addition slopes. The south and west elevations of an addition take the full force of a Houston summer, and a roof that was not vented properly under the new framing will cook from below and curl at the edges within five to seven years.
- Popping or creaking when you walk through the addition. This is usually framing or subfloor, not roofing, but it shows up on additions more than original construction because the floor system was tied to the existing slab or framing differently. We check the connection detail when we inspect.
- Flashing that has pulled away from vertical walls. Houston’s clay soil moves, and additions settle slightly in the first two years. Flashing that is nailed too tightly or bent at the wrong angle will pull away as the new foundation settles, opening a path for wind-blown rain.
See the difference
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AfterReplacement Cost & What’s Included
When the issue is isolated to the Tamko roof or exterior on an existing addition or ADU, a full re-roof of the addition in Houston typically falls between $8,000 and $20,000 depending on square footage, slope, and how much of the transition work needs to be rebuilt. When the problem is deeper than the roof, meaning framing, sheathing, or foundation connection work, the project moves into the $45,000 to $130,000 home addition range and becomes a rebuild rather than a repair.
Every Elmstead Remodeling Houston project starts with a written price before any work begins. That price includes the Tamko or equivalent roofing product by name and color, the underlayment and flashing materials, all labor, the permit fees, and the daily clean-up that is part of our standard scope, never an add-on. We do not start work until you have seen and signed that number. The 365-Day Done Right Promise covers every completed project: if something is not done right, we make it right.
| Houston Home Addition / ADU Scope | Typical Installed Range |
|---|---|
| Addition roof replacement only (Tamko-compatible) | $8,000 – $20,000 |
| Full home addition, including foundation, framing, roofing, and finish | $45,000 – $130,000 |
| ADU construction (detached unit with utilities) | $90,000 – $220,000 |
| Garage conversion to living space | $30,000 – $80,000 |
What drives the range on a full addition or ADU is the same every time: the condition of the existing foundation and how it connects to the new one, whether the home is in a flood zone that raises the required floor elevation, the number of plumbing walls, and the finish level you choose for cabinets, counters, and fixtures. We carry KraftMaid and Wellborn cabinets, Cambria and Silestone countertops, and Kohler and Moen fixtures on these projects, so the price you sign is tied to named products you can research, not a “builder grade” allowance that leaves you guessing.
DIY or Call Us?
The honest split is this: if you are seeing a leak and want to understand where the water is coming from, you can safely do the observation work. Go into the attic above the addition during a heavy Houston rain, look for the water entry point, and mark it. Check the gutters for granule buildup. Look at the flashing seams from the ground with a pair of binoculars. None of that requires a ladder or a tool.
What we do not recommend is removing shingles, pulling flashing, or working on the transition seam yourself. The valley and wall transitions on an addition carry a lot of water during a Houston storm, and a homeowner who opens up a seam and does not get the layering sequence right creates a leak that is worse than the one they were chasing. The same is true for any structural work where the addition ties into the original framing. If you have identified the problem and want a straight answer on what it will take to fix it, call (254) 272-5240 and we will walk the property with you.
A written price and a covered floor before any work begins – that is where the trust starts.
FAQs
A properly installed Tamko shingle roof on a Houston addition will last 20 to 30 years, but the transition flashing and underlayment at the seam between the addition and the original house will typically need attention around the 12 to 15 year mark. Houston’s heat and humidity work on the seams before they work on the shingle field. Call (254) 272-5240 and we will inspect the roof and give you a written answer on what is needed.
Yes, when the problem is isolated to the roof, flashing, or exterior envelope, the repair is almost always a fraction of the rebuild cost. The deciding factor is the condition of the framing and the foundation connection where the addition meets the original structure. If the framing is sound, we repair the failing system and leave the rest alone. Call us for a free assessment and a written price either way.
A full home addition or ADU in Houston typically takes 3 to 6 months, with most of the early time spent on permits, foundation work, and the structural tie-in before interior finishes begin. Weather and City of Houston permitting both affect the schedule, and we walk through the timeline at the start of the project so the family knows what to expect each week.
We stock the Tamko self-adhered underlayment and flashing products on the project trailer because those are needed on nearly every addition and roof repair we do in Houston. Shingles are ordered per project so the color batch is matched to the specific job, and we order through our local suppliers to keep the lead time short. The written price includes all materials by name, so you know exactly what is going on the roof before we open a single bundle.
If you have a Tamko addition or ADU in Houston that is failing, or you are planning an addition and want the exterior to match what you already have, call (254) 272-5240. We will come out, look at the existing roof or the site, and give you a written price for the work. No estimates that grow after the crew arrives, no surprises at the end. Just a straight answer and a plan.
Written by Graham Stein, Owner, Elmstead Remodeling Houston at Elmstead Remodeling Houston, serving Houston and nearby areas.
