Picket Fence Installation Guide

For UK homeowners, a well-installed picket fence adds value and security. However, achieving perfectly straight lines and uniform spacing requires precision, especially when navigating slopes or uneven ground typical of many British plots.

What Does the Work Involve?

• Site Preparation: Clearing the boundary line of old fencing, vegetation, and debris to ensure a clean workspace.
• Setting Out: Using string lines and spirit levels to mark exact post positions, ensuring the fence follows the property boundary accurately.
• Digging Post Holes: Excavating holes to a depth of at least 600mm (2ft) to ensure stability against wind and ground movement.
• Post Installation: Setting timber or concrete posts into the ground using rapid-set post-mix (Postcrete) and ensuring they are perfectly vertical.
• Fixing Rails: Attaching horizontal "cant" or "arris" rails to the posts, which provide the structural framework for the pickets.
• Attaching Pickets: Nailing or screwing individual pales to the rails, using a spacer to ensure consistent gaps between each picket.
• Finishing: Trimming post tops if necessary and applying a high-quality wood preservative, stain, or exterior paint.

Typical Costs

The cost of a picket fence is usually calculated per linear metre. Prices vary significantly based on the height of the fence (typically 3ft or 4ft) and the type of timber used.

Total project costs are influenced by the ground condition; digging into heavy clay or through old concrete footings will increase labour time. Prices include VAT at the standard rate.

How Long Does It Take?

• Small Front Garden (up to 10m): 1 day. This includes removal of old materials and full installation.
• Medium Boundary (10m - 25m): 2 days. Allows time for post-mix to cure and more complex levelling.
• Large Projects or Sloped Sites: 3+ days. Slopes require "stepping" the panels, which involves custom cutting and extra precision.

DIY or Professional?

Installing a picket fence is a popular DIY project for those with basic carpentry skills. However, the "simple" look is deceptive; if your posts are even slightly out of alignment, the entire run will look crooked.

Professional installers use professional-grade laser levels and have the heavy-duty equipment needed to break through stubborn ground, ensuring a fence that stays straight for decades rather than months.

If you are installing a gate, professional fitting is highly recommended to prevent "drop," which causes the gate to drag on the ground over time.

Choosing the Right Tradesperson

• Check Qualifications: Look for members of the Association of Fencing Industries (AFI) or tradespeople with a valid CSCS card.
• Waste Management: Ensure they hold a valid Environment Agency Waste Carrier Licence to dispose of your old fence legally.
• Red Flags: Be wary of anyone who doesn't suggest using Postcrete or fails to mention "pressure-treated" (Tanalised) timber.
• Ask: "How deep will you set the posts?" (Minimum should be 600mm).
• Ask: "Will you use galvanised fixings to prevent rust streaks on the wood?"
• Ask: "Can I see photos of your previous picket installations, specifically on corners or slopes?"

UK Regulations

• Height Restrictions: You generally do not need planning permission for a fence under 2 metres high. However, if the fence is adjacent to a highway (road or pavement), the limit is usually 1 metre.
• Conservation Areas: If you live in a Conservation Area or a Listed Building, you must check with your local council before changing any boundary treatments.
• Boundary Ownership: Confirm which side of the boundary you own. Traditionally, the "good" side of the fence faces your neighbour, though this is a courtesy rather than a law.

Common Problems

• Post Rot: Posts fail prematurely if they are not pressure-treated or if the concrete footing creates a "cup" that holds water against the wood.
• Uneven Spacing: Using a "by eye" approach leads to a messy finish. A professional uses a physical spacer block for every single picket.
• Rust Stains: Using cheap, non-galvanised nails will result in black streaks running down your white or natural wood pickets within one winter.
• Unstable Gates: Using posts that are too thin to support the weight of a swinging gate will lead to the gate failing to latch within weeks.

Frequently Asked Questions

Do I need planning permission for a 4ft picket fence in my front garden?

In the UK, if your fence is next to a road used by vehicles, the height limit is usually 1 metre (approx 3.2ft) without planning permission. A 4ft fence would likely require a formal application.

What is the best wood for a picket fence?

Pressure-treated softwood (Tanalised) is the standard choice for its balance of cost and durability. For a premium finish, Oak or Western Red Cedar offer superior natural rot resistance but at a much higher price point.

How much gap should there be between pickets?

A standard gap is usually half the width of the picket itself (roughly 35mm to 50mm). This provides a balance of privacy and wind resistance while maintaining the classic look.

Can a picket fence be installed on a slope?

Yes, there are two methods: "stepping," where the fence follows the slope in level sections like stairs, or "raking," where the rails follow the angle of the ground. Stepping is more common for picket fences.

Should I paint or stain my picket fence?

Painting (usually white) offers the classic look but requires more maintenance as it can peel. Stains soak into the wood and are easier to refresh, though they don't provide that "solid" colour finish.