DIY Pergola Swing with Arched Beam & Full Dimensions — Build Plans

DIY Pergola Swing with Arched Beam & Full Dimensions — Build Plans

A freestanding pergola swing with heavy 12 × 12 cm support pillars, elegant curved arched beams, slatted pergola roof, and a suspended chain-hung bench swing. Designed as a standout backyard centerpiece for patios, gardens, pool areas, or outdoor lounges. Access over 16,000 woodworking plans

Finished Dimensions

Part Metric Imperial
Overall Width 2500 mm 98 3/8 in
Overall Depth 1600 mm 63 in
Overall Height 2400 mm 94 1/2 in
Swing Seat Width 1600 mm 63 in
Swing Seat Depth 550 mm 21 5/8 in
Swing Seat Height from Ground 450 mm 17 3/4 in

Structure Overview

The build includes:

  • Four heavy timber pillars
  • Decorative arched side beams
  • Slatted pergola roof
  • Reinforced cross braces
  • Chain-hung swing bench
  • Wide A-frame side supports
  • Concrete anchoring system

Recommended Wood Types

Best outdoor lumber choices:

  • Cedar
  • Treated pine
  • Douglas fir
  • Cypress
  • Meranti
  • White oak

Main Timber Sizes

Use Metric Imperial
Main Pillars 120 × 120 mm 4 3/4 × 4 3/4 in
Arched Beams 190 × 45 mm 7 1/2 × 1 3/4 in
Roof Slats 90 × 20 mm 3 1/2 × 3/4 in
Swing Frame 90 × 45 mm 3 1/2 × 1 3/4 in

Materials List

Lumber

  • Structural outdoor timber
  • Pergola slat boards
  • Hardwood swing slats

Hardware

  • Heavy-duty eye bolts
  • Swing chains
  • Exterior lag bolts
  • Carriage bolts
  • Structural screws
  • Galvanized brackets

Pillar Dimensions

Vertical Posts

Qty Metric Imperial
4 2400 × 120 × 120 mm 94 1/2 × 4 3/4 × 4 3/4 in

Pillar Spacing

Direction Measurement
Width Between Posts 2100 mm
Depth Between Posts 1300 mm

Concrete Footings

Recommended Footing Size

Metric Imperial
350 × 350 × 600 mm deep 13 3/4 × 13 3/4 × 23 5/8 in

Use:

  • Concrete anchors OR
  • Embedded post brackets

Arched Beam Dimensions

Curved Side Beams

Qty Metric
2 2500 × 190 × 45 mm

Arch Curve Specification

Maximum rise:

  • 180–220 mm above beam ends

Create curve using:

  • Flexible batten template
  • Jigsaw cut

Beam Overhang

Side Overhang
200 mm

Provides:

  • Elegant pergola profile
  • Better visual balance

Pergola Roof Slats

Slat Dimensions

Qty Metric
8–10 1600 × 90 × 20 mm

Spacing:

  • 80–100 mm gaps

Top Beam Structure

Main Cross Beam

Qty Metric
1 2200 × 190 × 45 mm

Mounted across top center for swing support.

Cross Bracing

Install:

  • 45° corner braces
  • Between pillars and beams

Recommended size:

  • 500 × 90 × 45 mm

Improves:

  • Sway resistance
  • Structural stiffness

Swing Bench Dimensions

Part Metric Imperial
Overall Width 1600 mm 63 in
Seat Depth 550 mm 21 5/8 in
Backrest Height 650 mm 25 5/8 in

Swing Seat Frame

Base Rails

Qty Metric
2 1500 × 90 × 45 mm

Seat Slats

Qty Metric
10–12 550 × 70 × 20 mm

Spacing:

  • 8–10 mm

Backrest Angle

Recommended:

  • 100–105°

Provides comfortable lounging position.

Swing Suspension System

Chain Mounting

Use:

  • M12 eye bolts
  • Rated swing chain
  • Lock nuts + washers

Chain Length

Metric Imperial
1800–2000 mm 70 7/8–78 3/4 in

Swing Clearance

Maintain:

Clearance Area Measurement
Rear Swing Clearance 350 mm
Front Swing Clearance 500 mm
Seat-to-Ground 450 mm

Recommended Hardware Ratings

Component Rating
Eye Bolts 250+ kg
Chain Heavy-duty galvanized
Fasteners Exterior structural grade

Roof Style Options

Open Slat Pergola

  • Most common
  • Decorative shade pattern

Polycarbonate Roof

  • Rain protection
  • UV filtering

Fabric Canopy

  • Softer aesthetic
  • Removable shade

Sanding Guide

Stage Grit
Initial Prep 100
Finish Sanding 180
Final Smooth Finish 220

Round all exposed edges for comfort and appearance.

Outdoor Finish Recommendations

Best Options

  • Exterior decking oil
  • Marine spar varnish
  • UV-resistant outdoor stain

Reapply every 12–18 months.

Assembly Order

  1. Pour concrete footings
  2. Install post brackets
  3. Mount vertical pillars
  4. Cut and install arched beams
  5. Add cross braces
  6. Install pergola roof slats
  7. Build swing bench
  8. Install eye bolts
  9. Hang swing chains
  10. Test swing balance
  11. Sand and finish entire structure

Optional Upgrades

  • Built-in LED lighting
  • Cup holders
  • Outdoor cushions
  • Hanging plants
  • Privacy slat wall
  • Side tables
  • Curved roof rafters
  • Decorative timber end cuts

Recommended Cushion Dimensions

Part Metric
Seat Cushion 1600 × 550 × 80 mm
Back Cushion 1600 × 500 × 80 mm

Use:

  • Outdoor foam
  • UV-resistant fabric
  • Waterproof covers

Estimated Weight Capacity

Component Capacity
Swing Seat 250–350 kg
Pergola Structure Heavy outdoor duty

Maintenance Tips

  • Tighten swing hardware every 3–6 months
  • Re-seal wood yearly
  • Inspect chains regularly
  • Keep base area drained
  • Avoid standing water around posts

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