Estimating fencing materials means turning the measured quantities from your takeoff into a buy list with the right quantities and the right waste factor. Fencing is a module trade, posts on a set spacing and rails stretched between them, so the takeoff is mostly a count of posts and a length of fabric with the hardware that ties them together. Get the spacing right and the buy list almost writes itself.
What You Are Counting
You are counting and measuring four things: linear feet of fence by type and height, posts by type and spacing, rails and fabric to span between posts, and the hardware and concrete that hold it all up. Fence run length is LF by type, chain link, wood picket, vinyl privacy, ornamental steel. Posts are counted each and sorted into line posts, terminal posts at ends, corner posts at turns, and gate posts at openings. Top rails and mid rails are LF. Chain link fabric is LF by height and gauge. Wood and vinyl fence pickets are counted each or taken off in SF of panel. Gates are counted each with their frame, hinges, latches, and posts. Concrete for post footings is taken off in CY or in 80 pound bags.
Units and Waste Factors
Fencing waste is moderate because posts and rails come in standard lengths and you can return unused fabric. The cuts at the end of a run and the broken pickets are where the waste lives.
- Posts, line, terminal, corner, gate: EA, bought in bundles of 10 or by the pallet. Waste 3 to 5 percent for posts bent in transit or hit on site.
- Top rail and mid rail, chain link: LF, bought in 21 foot or 24 foot lengths of schedule 40 pipe. Waste 5 to 10 percent for cuts at terminal posts.
- Chain link fabric: LF by height, bought in 50 foot rolls. Waste 3 to 5 percent because you stretch a full roll and trim the last length.
- Tension wire and bottom wire: LF, bought in 100 foot or 200 foot coils. Waste 5 percent.
- Wood pickets and rails: EA for pickets, LF for 2x4 rails. Picket waste 5 to 10 percent for warp and splits, rail waste 5 percent.
- Vinyl panels and posts: EA, bought in kits. Waste 3 to 5 percent.
- Ornamental steel panels: EA in 8 foot modules. Waste 2 percent because panels are pre built and you only cut the last one.
- Concrete for post footings: CY or 80 pound bags. Waste 5 to 10 percent for over dug holes and spillage.
- Hardware, hinges, latches, caps, ties, bands, brackets: EA, bought in bags of 50 or 100. Waste 5 percent because they are cheap and easy to lose.
Step by Step Material Takeoff
- Lay out the fence line on the site plan. Mark every run with its type and height. Break the run at every gate, every corner, and every end, because each of those is a terminal post that costs more than a line post.
- Count the posts. Line posts are spaced at 10 feet for chain link and ornamental steel, 8 feet for wood and vinyl, and 6 feet on a high wind exposure. Terminal posts go at every end, corner, and gate. Gate posts are sized by gate width, a 2 inch post for a 3 foot walk gate and a 4 inch post for a 6 foot drive gate.
- Take off the rails. For chain link, top rail runs the full line length in LF, plus a mid rail on fences over 6 feet. For wood and vinyl, 2x4 or 2x6 rails run in pairs or triples, so multiply the line LF by the number of rail rows.
- Take off the fabric or pickets. Chain link fabric is LF by height, with no deduction for gates because the gate opening uses a separate gate frame. Wood pickets are taken off in SF of panel, which is panel length times height, divided by the picket width plus the gap, plus 10 percent waste.
- Count the gates. Each gate is one frame, two hinges, one latch, two gate posts, and the hardware to mount it. Walk gates are 3 to 4 feet, drive gates are 8 to 16 feet, double drive gates are two leaves.
- Take off the concrete. Each post gets a footing. A typical line post is an 8 to 12 inch diameter hole, 24 to 36 inches deep, and a terminal post is 12 to 18 inches diameter by 36 to 48 inches deep. Compute CY per hole times the post count, then convert to bags or order ready mix if the count is over 50 bags.
- Take off the hardware. Tie wires or brace bands at each line post, tension bars and bands at each terminal post, post caps on every post, and rail ends at each terminal post. Count them per post and multiply.
- Apply waste, round up to the buy unit, and price. Add the waste factor per material, round up to whole rolls, bundles, and pallets, then price from your supplier sheet. Sum by fence type and compare to a cost per LF sanity check.
Where Estimators Miss
The first miss is terminal posts. Estimators line post the whole run at a uniform spacing and forget that every end, corner, and gate needs a heavier post and a deeper footing, which raises both the material and the concrete cost. The second miss is gate hardware, which is sold as a kit but priced separately on the quote, so a 16 foot double drive gate has four hinges, two latches, two drop rods, and two center stops that are easy to leave off the buy list. The third miss is slope. On a sloped site the fence follows grade, which means the panels rack and the posts step, and racking cuts the effective panel length so you need more posts and more rails than the plan LF suggests. Concrete is usually undercounted because holes get over dug in rocky soil and a 12 inch hole becomes 16 inches, which doubles the concrete per hole.
Worked Example
Take a 600 LF chain link fence at 6 feet high with one 8 foot drive gate and one 4 foot walk gate. Line posts at 10 foot spacing give 60 line posts, plus 4 terminal posts at the ends, 2 corner posts if there is one turn, and 2 gate posts for the drive gate and 2 for the walk gate, so about 70 posts total. Top rail is 600 LF plus 10 percent, or 660 LF, bought as 30 lengths of 24 feet. Fabric is 600 LF by 6 feet, bought as 12 rolls of 50 feet. Concrete at 10 inch holes 30 inches deep is about 0.06 CY per post, times 70 posts, or 4.2 CY, ordered as 20 bags of 80 pounds. A representative direct cost lands near $5,400, with materials around $4,200 and labor around 40 hours at $30 per hour.
Putting It Together
A fencing takeoff that holds up lays out the run first, counts terminal posts as carefully as line posts, and sizes the hardware and the concrete to match. The buy list rounds up to whole rolls and pallets because you cannot buy half a roll of fabric, and the price comes from a current supplier sheet, not a cost per foot you remember from last season. Done that way the bid is defensible and the crew finishes the run without a parts run to the yard.