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Ideally, when you replace a fence post, you should also replace the concrete footing. The concrete bonds to your new post, creating a secure base. If you install a new post into old concrete, it won’t be as sturdy.

That said, it is possible. Sometimes the post will lift right out of the concrete. If not, you can use a high-lift car jack to try and lift the pole out of the footing. Put the new post into the same hole and backfill it with fast-setting concrete. Keep in mind, this won’t work well for metal posts.

You can use pressure-treated wood for a horizontal fence, but you’ll need to purchase a thicker and higher-quality variety to ensure it doesn’t sag or warp after you install it. Use #2 pine grade lumber and boards and thicker dimensional lumber, such as a two-by-six. You’ll also need to use stainless steel or hot-dipped galvanized fasteners, as the chemicals in the treated lumber will cause regular galvanized fasteners to rust. 

Yes, installing wrought iron fencing will usually require a building permit, as do all types of fencing. Building permits for wrought iron fencing typically cost between $150 and $500, and the price will vary based on where you live and how much your local building department charges. You may also need to pay for a property survey if you’re installing wrought iron fencing on your property line. This type of survey can cost around $500, but it prevents issues with building on neighboring properties, which can be much more expensive in the long run.

Fabricating an aluminum fence costs about $4,350 on average, ranging from about $2,450 to $6,500. Your fencing costs can run as low as $750 or as high as $11,000 or more, depending on the fence's size, complexity, and geographic location. You should consider additional cost factors including the thickness of the aluminum, height of the fence, necessary permits, and custom colors.