Introduction
Setting deck posts and pouring footings sits right on the DIY/pro borderline: physically demanding and technically unforgiving, but entirely learnable for a careful homeowner. This guide helps you decide honestly which side of the line your project falls on — when DIY is reasonable, when a professional is the smart money, and what each path actually costs. Start by sizing the job with the Deck Post Calculator so the decision is based on real quantities, not vibes.
When DIY Makes Sense
DIY post-and-footing work is a solid choice when several conditions line up: a low, ground-level or slightly elevated deck (posts under 4 ft / 1.22 m), straightforward soil that digs easily, a frost depth you can reach with a rented auger (generally 36 in / 91 cm or less), and a simple rectangular layout with one or two beam lines. If you can dig, mix, and carry — and you are willing to learn layout with batter boards and string lines from the pro tips guide — a 6-to-8-post deck is a very achievable long weekend.
The DIY advantages are real: you save the labor premium (typically $200-$400 per post installed), you control the schedule, and you learn skills that transfer to every future project. Recruit one able-bodied helper — setting a 12-ft 6×6 plumb solo is possible but unnecessarily hard, and concrete waits for no one. The non-negotiables: pull the permit yourself, respect the inspection sequence (footings before pour, framing before decking), and do not improvise on spacing, footing size, or connectors — the code compliance guide covers what the inspector will check.
When to Hire a Professional
Bring in a contractor when the project includes any of these: an elevated deck (posts over 6 ft / 1.83 m, or a walking surface more than about 30 in / 76 cm above grade in many jurisdictions), deep frost lines requiring 42-inch-plus (107 cm+) holes, rocky or fill soil, sloped sites needing tall or stepped footings, multi-level designs, or any structural detail you cannot confidently draw and defend. Also hire out if the permit office wants engineered drawings — that is the code telling you the project has outgrown prescriptive tables.
Pros also earn their fee on speed and risk: a crew with a skid-steer auger digs in an hour what takes a homeowner a weekend, and they carry the liability if a footing fails. If anyone will walk under or sleep beneath the deck (a raised deck over a patio, for example), professional installation is cheap insurance. The common mistakes guide shows the failure modes you are paying a pro to avoid.
Cost Comparison
Take a typical 8-post deck with 18-inch-diameter, 42-inch-deep footings (45.7 x 107 cm) as the comparison basis:
| Line item | DIY | Hired pro |
|---|---|---|
| 8 x 6x6x12 PT posts | $360-$560 | $360-$560 (materials) |
| Concrete (~1.8 yd^3 / 1.4 m^3) | $280-$450 | $280-$450 (materials) |
| Hardware (bases, caps, bolts) | $150-$280 | $150-$280 (materials) |
| Tool rental (auger, mixer) | $150-$250 | $0 |
| Labor | Your weekend | $1,600-$3,200 |
| Total | $940-$1,540 + your time | $2,540-$4,770 turnkey |
The pro premium on this job is roughly $1,600-$3,200 — the price of two to four weekends of hard labor, the digging equipment, and the warranty. Note the materials cost is identical either way; what you are really deciding is the value of your time and your tolerance for the physical work and the responsibility. Get the quantities behind these numbers from the estimating guide before requesting bids, so you can compare quotes against your own takeoff.
The Hybrid Option
Many homeowners split the difference: DIY the layout and digging, hire the concrete pour, or vice versa. The most popular hybrid is doing everything except the holes — a contractor with an auger knocks out a day of digging in an hour, and you handle setting, plumbing, and pouring. Another sensible split: DIY a ground-level deck’s posts while hiring an engineer or experienced carpenter for a half-day to review your layout and beam sizing before the inspection. A third option is hiring just the footing inspection prep — a pro verifies your depths, diameters, and layout the morning of the inspection call. You keep most of the savings while buying targeted expertise exactly where mistakes are expensive.
Questions to Ask a Contractor
- How many deck post-and-footing jobs have you done in this jurisdiction, and can I see permit cards from recent ones?
- What footing diameter and depth are you proposing, and how does that relate to our local frost line?
- 6×6 or 4×4 posts, and what treatment rating? (Listen for UC4A or better on anything near grade.)
- Standoff post bases — included? What connector brand and spec?
- Who pulls the permit and meets the inspector, and is that in the bid?
- What is the fix policy if a footing heaves or a post goes out of plumb within the first year?
Get three bids, compare them against your own material takeoff, and be wary of any quote far below the others — it usually means smaller footings, skipped hardware, or no permit. The cost guide gives you the price ranges to sanity-check each line.
Related Guides
- Deck Post Complete Guide — the flagship overview for either path.
- Deck Post Cost Guide — detailed material and labor pricing.
- Deck Post Pro Tips — the techniques DIYers need on build day.
- Deck Post Code Compliance — permits and inspections for both DIY and hired work.
- Deck Post Build Checklist — sequencing the work whichever path you choose.
Get Your Number
Decide with data: run your dimensions through the Deck Post Calculator, price the materials, and compare against two or three contractor bids built from the same quantities. If the job is low, simple, and well-drained, DIY with confidence — and if it is tall, deep, rocky, or complicated, hire it with equal confidence. The most expensive choice is starting DIY and calling for rescue halfway through the holes.
Disclaimer: Results are planning estimates only. Verify quantities and prices with your supplier and consult a licensed professional or your local building authority for structural or code-related decisions.
