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Fence Installation Guide: Step-by-Step for DIY & Pros
- Jul 7
- 5 min read
Most fence installs go wrong long before the first post goes in the ground. They go wrong at the tape measure, in the layout, and in the choice of a system that fights you the whole way.
This fence installation guide walks the job in the order you actually do it, from marking the line to sliding in the last infill piece. It works whether you are a homeowner tackling a weekend project or a contractor pricing a run, and it leans on one honest idea: the easier the system is to assemble, the fewer mistakes you make.
Before you dig: plan and permits
The dull first steps are the ones that save you a torn-out fence later.
Confirm the property line. Do not trust the neighbor's old fence or a hedge. Pull your plat or survey so the fence sits on your side of the line.
Call for utility locates. In the US that is 811. It is free, and hitting a gas or fiber line while digging post holes is the kind of mistake you only make once.
Check permits and setbacks. Height limits, setback distances, and corner-of-lot rules vary by city and HOA. A quick call now beats a rebuild order later.
Sketch the run. Note total length, corners, gate locations, and any slope. This is what a dealer needs to spec the right parts.
If your neighbor shares the line, this is also the moment to talk finish. California's "good neighbor" rule expects both faces to look finished, and a double-sided system like Modern Yard is compliant on that front out of the box.
Tools and materials checklist
Gather everything before you start so you are not making a hardware-store run with half-set concrete.
Tape measure, mason's line, and marking paint or stakes
Post hole digger or power auger
Level (post level and a longer 4-foot level)
Cordless drill or impact driver
Rubber mallet
Wheelbarrow and a mixing tool for concrete
Fast-setting concrete, gravel for drainage
Your fence system: posts, rails, and infill
With a modular metal-post system, that last line is short and standardized. Modern Yard's myPost steel posts come in set heights (myPost-74in, myPost-98in, and myPost-114in), and the rails and infill are made to drop onto them, so you are not sourcing a pile of mismatched lumber and brackets.
The 8-step install sequence
Here is the core of the job. Follow the order; the order is what keeps the line straight.
Space the post holes. Mark hole centers along the string at the spacing your product spec or dealer's guide calls for. Do not eyeball this; consistent spacing is what makes rails and infill fit.
Dig to depth. Dig each hole below the local frost line and wide enough for concrete. Add a few inches of gravel at the bottom for drainage.
Set the first and last posts. Plumb them in both directions, brace them, and set them in concrete. These two anchor everything between.
Set the intermediate posts. Work off the string line, keeping every post plumb and at consistent depth. Let the concrete cure per the bag.
Attach the rails. With a modular system, rails connect to the posts at set points. Check that top rails are level (or follow your slope plan) as you go.
Install the infill. Drop or slide the infill into place between the rails. This is the step that reads as "finished," and on a standardized system it moves fast.
Hang gates and clean up. Set gate hardware, check the swing, backfill and grade around posts, and close any gaps at the ground.
Save your trickiest sections, corners, gates, and slope transitions, for after you have found a rhythm on the easy straight runs.
Where installs go sideways
A few failure points cause most of the callbacks. Watch these.
Step
What you do
Watch out for
Layout
Run a tight string line end to end
A sagging string bows the whole fence
Post setting
Plumb every post in two directions
One leaning post throws off the next rail
Depth
Set posts to consistent depth below grade
Matching height above grade hides uneven burial
Infill
Fit infill after concrete cures
Loading posts early can shift them
The theme across all four: the structure has to be right before the looks go on. That is easier when the post does the structural work and the infill is a separate, standardized piece rather than a single panel trying to do both jobs.
Why a modular system is easier to install
The reason to care about the system, not just the steps, is speed and margin for error.
Modern Yard separates the fence into two jobs. The myPost steel post carries the structure: a high-strength steel core with galvanized zinc coating, epoxy primer, an electrostatic powder-coat finish, and foam-sealed ends to block moisture. It is rated to 120 MPH wind resistance and backed by a 25-year limited warranty. The infill, whether that is myRedwood composite, myFireGuard steel (ASTM E84 Class A fire rating), aluminum, or wood, handles the looks and simply drops onto that platform.
Because the posts, rails, and infill are standardized parts, the assembly logic is the same every time: set posts, attach rails, slide in infill. Modern Yard claims roughly 50 percent easier installation than comparable systems, which is the brand's own figure rather than an independent test, but the reasoning holds. Fewer custom cuts and fewer loose parts mean fewer ways to get it wrong. It also means any qualified fence contractor can install it, and the system is sold through professional distributors such as Master Halco, BMD, and Golden State Lumber.
Frequently asked questions
How deep should fence posts go?
Set posts below your local frost line so ground movement in winter cannot heave them, and add gravel at the bottom of the hole for drainage. Measure depth below grade rather than height above it, especially on a slope, so buried lengths stay consistent.
Can I install a fence myself, or do I need a contractor?
Both are realistic. A straightforward straight run on level ground is a common DIY project, while long runs, slopes, and gates are where a contractor earns the fee. A modular system lowers the skill bar because the parts are standardized and made to assemble in a fixed sequence.
What is the hardest part of installing a fence?
Setting posts plumb and to a consistent line. Once the posts are right, rails and infill follow easily; if the posts drift, every step after them fights you. That is why the layout and post-setting stages get the most attention in this guide.
Ready to plan your run?
Measure your line, sketch your corners and gates, then use Modern Yard's dealer locator to find a supplier who can spec your posts, rails, and infill from one modular system. Bring your sketch and let the standardized parts do the hard part for you.
