Every Tool You Need to Build a Deck

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A deck is one of the most common first big DIY projects, and the tool list looks long until you break it down by phase. You probably own half of what you need already. The other half can be borrowed for the two to three weekends the build takes. Here is everything organized by project phase, with clear guidance on what to buy, what to borrow, and what to skip entirely.

Layout and Footings

Before a single board gets cut, you need to lay out the deck footprint and dig footing holes. This phase is less about power tools and more about precision. A mistake here travels through the entire project.

Tape measure (25-foot minimum) — you will measure hundreds of times during a deck build. A short tape is a headache on a 12x16 deck. Look for one with at least 10 feet of standout so you can measure across the frame solo without the blade folding. The Stanley FatMax 25-foot ($25 to $30) and Milwaukee 25-foot ($20 to $28) are both solid options. Measuring tools overview.
String line and stakes — for laying out the perimeter and checking that the frame is square. The 3-4-5 method works at any scale: measure 3 feet along one side, 4 feet along the other, and the diagonal should read exactly 5 feet. Scale up to 6-8-10 or 9-12-15 for larger decks. A $3 mason's line and some scrap wood stakes are all you need.
Post-hole digger or auger — deck footings need to be 12 inches wide and below your local frost line, which runs 36 to 48 inches deep in most northern climates. A clamshell post-hole digger ($30 to $40) handles 4 to 6 holes without too much suffering. For more than 6 holes, borrow a gas-powered auger. Buying one runs $200 or more, and renting runs about $75 per day, so borrowing from a neighbor who has already built their own deck is the clear winner here. If you know someone with the right tool, FriendsWithTools can help you coordinate the loan.
Level (48-inch) — critical for checking that posts, beams, and joists are plumb and level. A torpedo level works fine for individual posts, but you need the 48-inch for checking across joist spans and confirming the beam sits flat.
Speed square — for marking angles, checking square on every connection, and guiding your circular saw for crosscuts. The $12 Swanson Speed Square has been the standard for decades. Keep one in your back pocket for the entire project.

Framing

Framing is where the deck takes shape. This phase is labor-intensive and requires your two most important power tools working in tandem: a saw for cutting and a driver for fastening.

Circular saw — the primary cutting tool for framing lumber. A 7-1/4 inch blade cuts through 4x lumber (with a flip) and handles all 2x cuts in a single pass. Cordless models from DeWalt, Milwaukee, and Makita in the $150 to $250 range are convenient for deck work since you are constantly moving around the site. A corded saw ($60 to $100) works fine if you have a nearby outlet and a long extension cord. Circular saw buying guide.
Cordless drill/driver — for pilot holes and driving structural screws. Keep two batteries on hand because you will drain them, especially in pressure-treated lumber. A drill with a torque clutch helps prevent overdriving screws into soft PT wood, which weakens the connection. Cordless drill guide.
Impact driver — drives 3-inch and 4-inch structural screws without stripping them or stalling the motor. If you do not own one, this is the project that will convince you to buy one. The difference between driving lag screws with a drill and driving them with an impact driver is the difference between fighting every fastener and placing them effortlessly. A good 20V impact driver runs $80 to $130 bare tool.
Ratchet set and socket set — for tightening carriage bolts and lag bolts that attach the ledger board to the house. A 1/2-inch drive ratchet with standard SAE sockets covers everything you will encounter on a typical residential deck.
Joist hanger tool or palm nailer — not strictly required since you can use code-approved screws for joist hangers instead of nails. But a palm nailer ($30 to $50) makes hanging 20 or more joist hangers significantly faster. This is a good candidate for borrowing because you will use it for one afternoon.
Clamps — bar clamps for holding boards in position while you fasten them. You need at least 4, and 6 is better because you can pre-clamp the next section while fastening the current one. 12-inch quick-grip clamps ($8 to $15 each) are the most versatile size for deck framing.

Decking and Railing

Once the frame is complete, installing deck boards and railing is the most satisfying phase because progress is visible and fast. A few specialized tools make this stage smoother.

Chalk line — for snapping a straight reference line along the deck boards before trimming the overhang. One person, one snap, and you have a perfectly straight cut line across the entire deck. A $6 chalk line box pays for itself on the first use.
Spacer jig or deck board spacers — maintains consistent 1/8-inch gaps between deck boards for drainage and thermal expansion. Commercial spacers ($10 for a bag) are faster and more consistent than using nails as spacers, which is the old method. Some composite decking manufacturers include their own proprietary spacers.
Miter saw (10-inch sliding compound) — for railing post angles, stair stringer cuts, and railing balusters. Not strictly necessary since a circular saw handles all of these cuts, but a miter saw makes repetitive angle cuts fast and consistent. Particularly valuable for the railing phase where you might cut 40 or more identical balusters. Borrow one for the finish phase. Miter saw buying guide.
Router with a roundover bit — for easing the edges of wood deck boards and railing caps. A 1/8 or 1/4 inch roundover removes the sharp edges that catch bare feet and create splinter hazards. Skip this entirely for composite decking, which comes pre-eased from the factory.
Carpenter's pencil and straight edge — flat carpentry pencils do not roll off the deck and make visible marks on rough lumber. A 4-foot straight edge or the factory edge of a plywood sheet guides your circular saw for long rip cuts when you need to trim the last row of deck boards.

What to Buy vs. Borrow

The buy-vs-borrow decision on a deck project comes down to whether you will use the tool again within the next year. A deck is typically a one-time build, so many of the specialty tools fall squarely in the borrow category.

Buy ($50 to $100 total for the consumables and basics): tape measure, speed square, chalk line, carpenter's pencils, spacers, clamps, deck screws (structural and surface fasteners). These are either consumable or inexpensive enough that borrowing is not worth the coordination. You will also use every one of them on future projects.

Buy if you do not already own: a cordless drill/driver and an impact driver. These are your two most-used power tools across all home projects, not just decks. If you are buying into a battery platform for the first time, see our battery platform guide to pick one and stay on it.

Borrow (save $500 or more): post-hole auger, miter saw, router, palm nailer, 48-inch level (if you only own a torpedo). These are the high-value borrow targets because they are expensive, bulky, and used heavily for two to three weekends before sitting idle. The auger alone is the single highest-value borrow on any deck project. See tools everyone borrows.

Do not buy: a framing nailer for deck framing. Screws are structurally superior to nails for deck connections, are code-required in many jurisdictions, and are far easier to remove if you make a mistake. That nail gun sitting in a friend's garage is not the right tool for this job.

Frequently Asked Questions

Can I Build a Deck With Just a Circular Saw?

Yes. A circular saw handles every cut on a deck: crosscuts, rip cuts, miter cuts (with a speed square guide), and even stair stringers with practice. A miter saw makes railing and trim work faster and more precise, but it is not required. If accuracy on repetitive angle cuts matters to you, borrow a miter saw for the finish phase.

Do I Need a Permit to Build a Deck?

Almost certainly yes. Most jurisdictions require a building permit for any deck over 30 inches above grade, and some require permits for any attached structure regardless of height. The permit application typically requires a plan showing dimensions, footing depth, beam and joist sizes, and railing height. Pull the permit before you start. Inspectors generally check footings before you pour concrete, framing before you install decking, and the finished railing before they sign off.