Deck & Porch Railing Installation in Austin

Railing materials compared in Texas heat

Aluminum is the easiest railing to live with in Central Texas. At $40 to $70 per linear foot installed it has a powder-coated finish that does not need paint, will not rot, and lasts 30 years or more. Dark colors do get hot to the touch in direct sun, so a lighter top rail helps on an uncovered deck.

Composite railing at $35 to $60 per linear foot matches composite decking and needs only cleaning. Wood at $20 to $35 per linear foot costs the least up front but needs stain every two to three years, and UV here breaks down finish quickly. Cable railing at $60 to $100 per linear foot uses stainless cable that stays open to the view and needs occasional tensioning.

Here is how that plays out on a typical deck. A 16x20 deck attached along one 20 foot side needs roughly 52 linear feet of railing on the three open sides, before subtracting the stair opening. In composite that is about $1,800 to $3,100. In cable, about $3,100 to $5,200.

Deck railing code basics

The International Residential Code requires a guard on any open side of a walking surface more than 30 inches above the grade below. Most Central Texas cities use it: Round Rock has adopted the 2024 IRC, and Georgetown, Leander, Liberty Hill, and Cedar Park use the 2021 edition, some with local amendments, so we check your city before we build.

The basic numbers are the same in both editions. Residential guards must be at least 36 inches tall, measured from the deck surface. Openings must be small enough that a 4 inch sphere cannot pass through. Guards and handrails must resist a 200 pound load applied at the top in any direction, which is why the post attachment matters as much as the railing itself.

Cable railing has to meet the same 4 inch rule while the cable is pushed. Cable flexes, so it needs tight spacing, strong end posts, and proper tension, or a child can spread two cables apart.

Stairs and handrails

Stairs with four or more risers need a handrail, set 34 to 38 inches above the stair nosings, and shaped so a hand can wrap around it. Open sides of stairs more than 30 inches above grade also need a guard at least 34 inches tall along the stair.

The triangle where the stair tread, riser, and bottom rail meet may be larger, up to a 6 inch sphere, and the rest of the stair guard must stop a 4 3/8 inch sphere. Deck railings often fail inspection on stairs, not the main deck, because the stair run was treated as an afterthought.

Keeping the view

If the deck looks out over Lake Travis, a greenbelt, or the Hill Country, cable or glass keeps the view open. Thin aluminum pickets are a middle option that costs less than cable and still reads lighter than wood balusters. A drink rail on top gives a flat surface without blocking the sight line.

From a seated position your eye sits right around the top rail, so a bulky top rail blocks more than the balusters do. That is one reason cable and slim metal top rails look so much more open from a chair.

Replacing railings on an older deck

Many decks built in the 1980s and 1990s have railings that no longer meet code: 2x2 balusters spaced too wide, rails under 36 inches, and posts notched and bolted at the rim with a single bolt. New railing on that deck has to meet current code, and the posts are usually the weak point.

We check the rim joist and blocking before we quote, because a new railing is only as strong as what it bolts into. On a deck with a sound frame, new railing is one of the best upgrades for the money. Railing replacement to current code on an existing deck runs $35 to $70 per linear foot.

Match the new railing to the deck's future, not just its past. If the boards will be replaced in a few years, pick a railing system that will look right with the new surface, since railing often outlasts the decking under it.