Decks & outdoors
Estimate fence posts, panels and pickets separately
A fence estimate begins with surveyed runs, corners and gate openings. Posts, rails, panels or pickets have different counting rules.
Understand the requirement
A fence estimate begins with surveyed runs, corners and gate openings. Posts, rails, panels or pickets have different counting rules. Divide each straight run into allowable bays, but do not assume that the longest available panel span is structurally acceptable for the site. Wind exposure, foundations and local requirements need separate resolution.
Choose the right calculation
For one isolated straight run, bay count is the rounded-up run length divided by the chosen bay width; post count is usually bays plus one. Shared corners can change the total, and gate posts have their own specification. Count rails per bay and pickets using the actual face width and gap, then check the end layout.
Check the product and the order
Use the chosen board and fixing system together. Material quantities do not validate beam spans, foundations, railing loads or drainage. Keep those design decisions separate and resolved before installation. Recheck board lengths, edge details and required clearances against the current guide, then price only compatible fasteners and accessories.
Worked example
A transparent planning example
Use these inputs to follow the calculation. The result below explains what can and cannot be concluded from it.
| Straight run | 12 m |
|---|---|
| Example bay | 2 m |
| Rails per bay | 2 |
This isolated run needs seven posts and twelve rails in the example. It excludes gates, corners and foundation material. The 2 m bay is a counting assumption, not a recommended structural span.
Compare the scenarios
The following comparison isolates the quantities or assumptions discussed in the example. It is a planning illustration, not measured performance data.
Values are calculated from the illustrative inputs above. Different products or dimensions change the result.
Planning checklist
- Measure the actual project and record the units next to every dimension. Identify the regions or parts counted so nothing is included twice.
- Confirm the exact material format and its product instructions. Replace the example inputs with declared dimensions, coverage or yield from your chosen product.
- Calculate the net requirement first. Show cutting or application allowance separately and check whether the example method fits your geometry.
- Convert to whole supplier units once, then price the complete order including compatible accessories, delivery and any separately specified repair stock.
Mistakes to avoid
Do not mix millimetres and metres in the same multiplication. Do not apply a reserve twice, and do not treat a rounded purchase unit as proof that every part fits. Recheck the specific limitation described in the worked example before paying for the order.
Questions and answers
Can I copy the example quantities directly?
No. The examples demonstrate the calculation, not your exact room, layout or product. Replace the inputs and check the specific limitation explained with the result.
What should I verify before ordering?
This isolated run needs seven posts and twelve rails in the example. It excludes gates, corners and foundation material. The 2 m bay is a counting assumption, not a recommended structural span.