Deck Builder in Louisville, KY
Most decks that fail don’t fail at the boards. They fail at the ledger — the board bolted to your house that the whole deck hangs from. Water gets behind it, the rim joist rots, and one day the deck separates from the wall with people standing on it. That is the single most common cause of catastrophic deck collapse, and in a city with as much pre-1960 housing stock as Louisville, it is worth knowing before you spend money on new boards.
Nest Construction is a licensed and insured general contractor in Louisville. Gil has run crews here since 2015 and we’ve closed out more than 255 projects. We build new decks, replace failing ones, and rebuild the parts of a deck you can’t see. Built Right. Built To Last.
Before we quote a replacement, we open the ledger
If you already have a deck, the first thing we do is get behind the ledger. Here’s what we’re looking for and how often we find it:
Nails instead of bolts. Plenty of decks built in Louisville before the mid-2000s hang on 16d nails or deck screws. Neither is rated for that load. A ledger needs lag screws or through-bolts on a specified pattern into solid rim joist.
No flashing. A ledger bolted flat against siding with nothing over the top traps water against the rim joist. Ten years later that rim joist is a sponge. We install metal flashing over the ledger and behind the siding, plus a self-adhered membrane on the ledger face.
Bolted to a rotten rim. Nothing about the deck matters if what it’s bolted to has failed. On older houses we sometimes find the rim joist has to be replaced before a new deck can attach at all — real money, and better found at the estimate than after demo.
Bolted to brick veneer. Brick veneer is not structural. On brick houses we usually build the deck freestanding, on its own posts, and skip the ledger entirely.
We photograph all of it and show you before we write the price.
What a deck costs in 2026
2026 installed pricing runs $25–$40 per square foot for pressure-treated, $30–$50 for cedar, $35–$55 for mid-grade composite, $50–$70 for premium composite, and $55–$80+ for capped PVC. Louisville runs roughly 10–20% under national averages on labor. Where our jobs land:
| Deck | Pressure-treated | Composite |
|---|---|---|
| 12×10 (120 sq ft), ground level | $3,000 – $5,000 | $5,000 – $8,000 |
| 16×12 (192 sq ft), 3 ft off grade | $6,500 – $11,000 | $10,000 – $16,000 |
| 20×16 (320 sq ft), raised with stairs | $11,000 – $18,000 | $17,000 – $27,000 |
Railing is a bigger line than people expect. Installed 2026 pricing: wood $20–$50 per linear foot, composite $25–$60, aluminum $50–$200, cable $60–$500. On a 20×16 deck that’s 52 linear feet of rail — $1,000 in wood, $2,000–$3,000 in composite, more in cable. Stair railing runs higher per foot than straight rail because of the cuts.
Stairs. A straight run down to grade with a landing and rail on both sides runs $1,200–$3,000 in our pricing, depending on rise and material. Stairs are labor, not lumber. A deck 6 feet off the ground needs more stringers, a landing pad, and sometimes a switchback.
Composite costs 40–70% more up front and buys you no sanding and no staining. Pressure-treated needs cleaning and re-sealing every 2–3 years to reach its service life, and most people don’t do it. If you’ll maintain it, PT is the better value. If you won’t, composite is.
Footings, frost, and why decks tip
A deck footing in Jefferson County has to bear on undisturbed soil below the frost line — 30 inches minimum under the Kentucky Residential Code. Above that depth, water in the soil freezes, expands, and lifts the footing. Do it for a few winters and the deck racks, the boards gap, and the ledger takes the load it was never meant to carry alone.
We dig to 30 inches, and size the footing to the load it actually carries rather than to whatever fits the tube. On sloped lots and on fill in newer subdivisions out toward Fern Creek and Middletown, we go deeper until we’re on undisturbed ground.
The other item people skip: lateral load connectors. Code wants hardware tying the deck framing back to the house floor framing so the deck can’t pull away sideways. Inexpensive, and it’s what an inspector looks for.
Permits in Louisville
You need a building permit for a deck in Jefferson County if any of these are true:
- It’s attached to the house
- Any point is more than 30 inches above finished grade
- It’s larger than 200 square feet
- It serves as the required exit from a door
A small freestanding ground-level platform under 200 square feet usually doesn’t need one. Almost everything else does. Louisville Metro Construction Review charges $0.105 per square foot with a $75 minimum — a 320 square foot deck lands at the minimum. Metro assesses a penalty equal to the full permit fee for unpermitted work.
Your deck also has to sit inside your zoning setbacks. Rear setbacks in typical Louisville single-family districts run around 25 feet, but form districts and corner lots change that. We check before we design.
What makes a deck fail early
- The ledger. Covered above. Nails, no flashing, rotten rim.
- Shallow footings. Frost heave. The deck moves, the connections loosen.
- Undersized joists or over-spanned beams. Bounce is the first symptom. Sag is the second.
- Galvanized hardware in contact with modern PT lumber. Today’s copper-based treatment corrodes standard galvanized fasteners. Deck framing needs hot-dip galvanized or stainless.
- No gap, no drainage. Boards butted tight trap water and cup. Debris packed into the joint between deck and house wicks straight into the siding.
- Deck boards over rotten framing. The most common “cheap” deck job in Louisville is new boards screwed to twenty-year-old joists. It looks finished and buys you three years.
Get a real number
Call or text Gil at (502) 821-9118 or email Office@nestconstructionky.com. We’ll walk the deck, pull a board, look at the ledger, and tell you whether you’re buying a repair or a rebuild. Written scope and fixed price before anything starts. Free on-site estimate, reply within 24–48 hours. Contact us here.
Serving Louisville and Jefferson County — St. Matthews, Jeffersontown, Prospect, Middletown, Anchorage, Lyndon — plus New Albany, Jeffersonville and Clarksville, Indiana.
Questions we get about decks
Can I put new boards on my old deck frame?
Sometimes. If the joists, beam, posts and footings are sound and the ledger is properly bolted and flashed, re-decking is a legitimate project and it saves you 40–50%. If the framing is 20+ years old and hangs on nails, new boards just hide the problem. We pull a board and look before we tell you which one you have.
How long does a deck take to build?
Most residential decks are 1–2 weeks of build time once we start. Add 1–3 weeks on the front for the permit and the footing inspection, which has to happen after we dig and before we pour.
Is composite worth the extra money?
It is if you weren’t going to maintain the wood. Pressure-treated needs cleaning and re-sealing every 2–3 years to last 15–20. Composite is a rinse and a broom and carries a 25-year fade-and-stain warranty from most manufacturers. Note that composite is boards only — the frame underneath is pressure-treated lumber either way.
Do I need a permit for a small deck?
Not if it’s freestanding, under 200 square feet, no point more than 30 inches above grade, and it isn’t the required exit from a door. Attach it to the house or go higher than 30 inches and you do. We pull the permit in our name and meet the inspector.