How to Restore a Cast Iron Garden Bench & Chairs: DIY Refurbishing for $35

Cast iron garden furniture lasts generations—if you replace the wood slats when they rot. I restored two benches and two chairs for ~$35 total (vs. $149+ each new). Here's the process.

Materials & Tools

• 1×3 pressure-treated (or cedar) boards, 8' lengths (cut in half)
• Stainless steel 1½" bolts, nuts, washers (original hardware usually rusted/stripped)
• Phillips screwdriver, 2× vise-grips, drill + bits, circular saw (or handsaw)
• Stain + sealer

Credit: mjpyro

Chairs First (Easier)

Credit: mjpyro

• Disassemble, measure each slat individually—cast iron isn't precise.
• Cut replacements, drill bolt holes using old slat as template (one at a time).
• Reassemble with new hardware. Stain/seal. ~2 hours per chair.

Credit: mjpyro

Benches: Methodical Approach

• Work on one bench at a time. Remove slats one by one—keep cast iron sides standing.
• Rusted nuts? Lock vise-grips on nut AND bolt head; turn.
• Back slats (3) then seat slats (5). Match each old slat to new for hole placement.
• Washers critical—cast iron holes near nut size; washers prevent pull-through.

Credit: mjpyro

Bench with Cast Iron Back Insert

• Remove back assembly; work on bench.
• Curved top slat missing? Improvise: two mitered pieces meeting at center, screwed from back, bolted through front.
• Reattach to frame. Replace seat slats. Add bottom support strap.

Rust Removal (If Needed)

• Angle grinder or wire brush.
• Natural: Salt + lime juice, soak 3–4 hrs, scrub.

Bottom Line

Four pieces restored, $35, one weekend. Solid, beautiful, and ready for decades more. Don't toss that rusty bench—rebuild it.