What size concrete post for 6ft fence with gravel board

Most advice seems to talk about 6ft panels on their own, but I’m not clear how much extra height the gravel board adds or how that affects what post size is actually correct.

Asked by Kelly on 11th Feb 2026
Expert Trade Answers
"10ft with gravel boards 8ft with just post and panels dig about 2 ft or there abouts"
Answered on 11th Feb 2026 - Member since Feb 2026 - report
"You want a 5ft panel with a 1 fott gravel board and a 2.4m post gives you a 6ft finish height"
Answered on 11th Feb 2026 - Member since Feb 2026 - report
"For a standard 6-foot (1.83 m) high fence with gravel board, the most suitable concrete post size is 8 feet 6 inches (2.6-2.7 m).
The total height of the structure above the ground consists of the height of the panel (6 feet) and the height of the gravel board (usually 6 or 12 inches):
6' + 6" Construction: Total height above the ground will be 6' 6" (1.98 m). Given that the post must be buried at least 2 feet (0.6 m), the total length of the post must be 8 feet 6 inches.
6-foot + 12-inch construction: For this height, 9-foot poles are required to ensure a secure anchorage in the ground."
Answered on 11th Feb 2026 - Member since Jan 2026 - report
"If you have a 6ft panel then you would need a 8ft post. This will be the correct height by the time it’s in the ground"
Answered on 16th Feb 2026 - Member since Feb 2026 - report
"9 foot concrete post is the correct size post for a 6 foot femce post"
Answered on 16th Feb 2026 - Member since Nov 2022 - report
"Gravel boards are typically 6’’ or 12’’. I would want a 9’ post"
Answered on 22nd Feb 2026 - Member since Jan 2017 - report
"8 feet , at least 2 feet in the ground, and ideally the post shud be pressure treated"
Answered on 25th Feb 2026 - Member since Feb 2026 - report
"9ft post and 6ft panels, that would give you enough to plant securely in ground"
Answered on 22nd Feb 2026 - Member since Feb 2026 - report
"The gravel boards will add an additional 6 inches to 1 foot in total height meaning you would require a 9 foot post, so as to have a minimum of 2 foot embedded in the ground and surrounded by concrete."
Answered on 26th Feb 2026 - Member since Oct 2025 - report
"Gravel boards are 1 ft so if you have a 6ft fence you would need 5 ft panels with a 1 ft gravel board and a 8ft post to make a 6 ft fence"
Answered on 26th Feb 2026 - Member since Dec 2025 - report
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