The “slowest” fencing style, in terms of the time it takes to install and the complexity of the installation process, can vary depending on several factors, including the materials used and the design of the fence. Generally, more straightforward fence styles tend to be quicker to install. Here are a few examples of fencing styles that may be considered slower due to their complexity:

1. Custom Iron or Metal Fencing: Intricate and ornate iron or metal fences with decorative details and custom designs can be time-consuming to install. Each piece must be precisely measured, cut, and welded to create the desired look.
2. Stone or Masonry Walls: Building a stone or masonry wall can be a slow and labor-intensive process. Each stone or brick must be carefully placed and mortared into position, which can take time.
3. Horizontal Slat Fencing: Fences with horizontal slats, especially if they are closely spaced and require precise alignment, can be slower to install than traditional vertical picket fences.
4. Privacy Fences with Lattice or Decorative Elements: Fences incorporating lattice panels, decorative elements, or custom features may require additional time and attention to detail during installation.
5. Fences with Multiple Materials: Fences that combine multiple materials, such as wood and metal or stone and wood, can be more time-consuming to construct due to the need for different installation techniques and materials.
6. Curved or Non-Rectangular Fences: Fences that follow curved or irregular property lines can take longer to install because they require custom measurements and cuts for each section of the fence.

It’s important to note that the speed of installation also depends on the experience and skill of the fencing contractor or installer. A professional with expertise in a specific fencing style may be able to complete the installation more efficiently than someone less experienced.

When choosing a fencing style for your property, consider factors such as your budget, design preferences, and the time available for installation. It’s advisable to consult with a professional fencing contractor who can provide guidance on the best fencing style for your needs and provide an estimate of the installation timeline.