Composite Gate Installation in Galveston County, TX
Walk and driveway gates faced with the same composite boards as your fence. What holds one up is hidden: a steel frame, a stiffened hinge post and adjustable hinges. Here is how the opening is sized, what hangs the gate, and the Galveston rules that shape it.
- Reviewed Sept 27, 2026
- Sources: Trex gate guides, Texas HSC §757, Galveston LDR
- Opening planner

A composite gate is a steel frame faced with composite boards. The boards give the look; the frame carries the load. In the published Trex Seclusions system that frame is 1¼ in square galvanized steel, welded and hidden behind the boards. The opening is sized to the panel: a standard single panel needs a 46¼ in opening (panel + 1⅞ in), and a double gate on two large panels needs 130½ in. The hinge post gets a steel stiffener, and posts go 30 in deep in 12 in holes, 2–3 days before the gate is hung.
Sources: Trex Seclusions single and double gate installation guides (©2013); Trex Fencing gates page, checked Sept 27, 2026.
What a composite gate is, and what we install
Composite boards are wood fiber or flour mixed into plastic and extruded. The USDA Forest Products Laboratory notes they are less stiff than solid wood, so on their own they would sag across a gate. That is why composite gates are built frame-first: the manufacturer welds a steel frame, then faces it with the same boards and cap rail as the fence. Trex describes its Seclusions gate this way, with the frame “hidden behind the Trex boards”. Its horizontal-board Horizons gate sits in a visible black powder-coated galvanized steel frame.
We install composite gates across Galveston County:
- Single walk gates in a composite privacy fence line, for side yards, pool equipment and trash access.
- Double swing gates for a driveway, trailer or boat, one leaf held by a drop rod.
- Gates for an existing composite fence, when the brand and color are still made. Bring the product name or a spare board to the estimate.
Material questions (what composite is, how to clean it) live on our composite fence page. Comparing materials? See wood gates, vinyl gates and aluminum gates, or the guide is a composite gate worth it?
The standard openings, in inches
Clear opening between post faces for each Trex Seclusions gate configuration. Anything else is a custom size.
Plan a composite gate opening
Enter the clear opening, inside face of post to inside face of post. You’ll get the panel width, swing space, posts and hardware, using the published Trex Seclusions gate guides as the example system, plus the Galveston rules that can change the plan.
Arithmetic from the Trex Seclusions single and double gate guides (©2013) and the current Trex gates page: single opening = panel + 1⅞ in; double opening = both panels + 2¾ in; standard openings 46¼ in and 65¾ in (the product page lists 65½ in) for singles, 91½ in and 130½ in for doubles; doubles listed up to 12 ft clear. Other brands size differently, so the estimate sets the real numbers. Height rules: City of Galveston LDR §2.501. Pool rules: Texas Health & Safety Code §757.004 and the City pool permit (2021 ISPSC). No prices.
What keeps a composite gate from sagging
A gate hangs off one post and leans on its hinges every time it opens. In the Trex guides, four parts share that load:
- The frame. Welded galvanized steel, not the composite boards, carries the structure.
- A stiffened hinge post. A steel stiffener slides inside the 5 × 5 in hinge post, and the hinges screw into that steel. If the hinge post isn’t tied to a fence panel, the guide calls for a heavier stiffener or a concrete-filled post.
- Adjustable hinges. Set about 6 in from the top and bottom, with at least 1 in between panel and post. Loosening the hinge nuts lets the installer raise the latch side or shift the panel. The guide warns that weather and temperature changes can call for periodic adjustment.
- An anti-sag cable. A steel cable and turnbuckle run from high on the hinge side to low on the latch side, fixed into the steel frame. Trex now lists it with its gates; the 2013 guide describes it as an option for large panels.
The posts are set in concrete 2–3 days before the gate is hung so the concrete can cure. On a coastal lot, also ask what the hinges, latch and screws are made of. Trex notes stainless steel components are available for coastal installations on its Horizons gates.
Single or double composite gate?
| Single | Double | |
|---|---|---|
| Standard openings (Trex) | 46¼ in; 65¾ in (65½ in on the product page) | 91½ in; 130½ in; up to 12 ft listed |
| Opening vs panel | Panel + 1⅞ in | Both panels + 2¾ in |
| Hinges | 2, about 6 in from top and bottom | 4, two per leaf |
| Holds closed with | Latch on the latch post, about 36 in up | Latch on the parked leaf + drop rod |
| Ground work | Two posts | Two posts + a drop-rod hole or footing |
| Good for | Walkways, side yards, equipment | Driveways, trailers, boats |
Trex Seclusions single and double gate guides (©2013); Trex gates page, checked Sept 27, 2026. One manufacturer’s system, shown as an example.
From estimate to a gate that latches
1. Free on-site estimate. We measure the opening and the swing space, check the ground under the gate, and look at what the hinge post will be tied to. We check the rules for your address, including HOA, pool and front-yard limits.
2. Choosing the gate. Single or double, vertical or horizontal boards, height, color, latch and hardware. If it’s joining an existing composite fence, we confirm the brand and color are still available before promising a match.
3. Posts first. Posts are set in concrete to the opening the panel needs, plumb and parallel, and left to cure before the gate is hung, per the manufacturer’s guide.
4. Hang and adjust. Hinges, latch, handles, drop rod and cable go on, then the gate is adjusted until it swings clear and latches cleanly. We walk it with you.
What affects cost and timing: single or double, standard or custom width, height, the product line and color, the number of gates, new or existing posts, concrete or dirt under a drop rod, removal of an old gate, and permit, pool or HOA review. Financing is available through the providers on our financing page, subject to credit approval.
What customers say on Google
5.0★★★★★91 Google reviews · read them all on Google
Very professional and friendly. Gotten automatic gates done and they are done to perfection! Thank you
Great work. Fast service. Very friendly. I recommend using this company to replace your fence.
Absolutely loved my fence once i saw the finished product. No hassle, no rude interactions, and no inconveniences everything was just perfect. One of the best fencing companies in Texas
Reviews shown word for word from the Mustang Fencing Services Google Business Profile (Galveston), captured 2026-09-27.
Questions we get about this
What is inside a composite gate?
How wide should the opening be for a composite gate?
Why do composite gates sag, and how is it prevented?
Can a composite gate match my existing composite fence?
How wide can a composite double gate be?
Can a composite gate be a pool gate?
Does a composite gate need maintenance?
Sources
Checked September 27, 2026. Rules change, so confirm with the City before you build.
- Trex Seclusions Gate Installation Guide (single, ©2013) — opening = panel + 1⅞ in, 46¼ and 65¾ in openings, steel post stiffener, 30 × 12 in holes, cure time, hinge and latch positions, 1 in clearance, hinge adjustment.
- Trex Seclusions Double Gate Installation Guide (©2013) — 91½ and 130½ in openings, + 2¾ in rule, ⅞ in centre gap, drop rod brackets and footing, optional anti-sag cable kit.
- Trex Fencing, Gates — 1¼ in galvanized steel internal frame, 6 and 8 ft heights, 46¼ and 65½ in single openings, doubles up to 12 ft, included hardware, stainless components for coastal Horizons installs.
- USDA Forest Products Laboratory, Wood Handbook (FPL-GTR-282, 2021) — Ch. 11–12: wood–plastic composites are less stiff than solid wood.
- Texas Health and Safety Code, Chapter 757 (Pool Yard Enclosures) — §757.004 gate rules: self-closing and self-latching, outward swing, lockable, 60 in latch height and exceptions.
- City of Galveston Land Development Regulations, Sec. 2.501 — residential fence heights: 8 ft; front yard 4 ft solid or 5 ft if 60% transparent.
Planning a composite gate?
We’ll measure the opening and swing space, check the rules for your address, and walk you through single or double, standard or custom. Free on-site estimates across Galveston County.
PLAN YOUR FENCE OR GATE PROJECT WITH US TODAY
Planning a new fence, a driveway gate or an automated entry? Tell us about your property and we’ll set up a free on-site estimate. We work with homeowners, HOAs and businesses across Galveston Island and Galveston County.
Prefer to talk? Call (346) 910-8641.
WHAT OUR CLIENTS ARE SAYING
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