Paver patio installation: excavation, base, borders, and drainage

The pavers are the visible finish; the base and drainage determine whether the patio stays level. Belgard’s installation guidance describes excavation, geotextile where needed, compacted aggregate, a bedding layer, and edge restraints. Its published installation guide calls for at least 8 inches of excavation below finished grade in a typical pedestrian assembly, with deeper excavation possible in freeze-thaw conditions (Belgard paving systems installation guide). Treat those figures as the manufacturer’s guidance for its system, not a universal local specification.

Compare the assembly, not the square-foot price

Ask the contractor to identify the paver product, thickness, pattern, border, joint material, and edge restraint. Then require the depth and material for excavation, subgrade, geotextile, aggregate base, bedding, and joints. Belgard says base depth is influenced by soil and application, and that aggregate should be compacted in lifts; a quote with “standard base” leaves those decisions hidden (Belgard installation).

Assembly line	Quote question
Excavation	How deep, how far beyond the perimeter, and where is spoil hauled?
Subgrade	Is soft or wet soil removed or stabilized?
Base	Material, depth, lift thickness, and compaction method?
Bedding	Sand or alternate system, depth, and leveling method?
Edge	Restraint type and perimeter layout?
Joints	Conventional or polymeric sand and sealing?
Drainage	Finished slope, drains, outlets, and adjacent transitions?

Make water a line item

Belgard warns that overlays and hardscape can create pooling if the base is impervious or drainage is not planned, and says the surface should slope away from structures. It also says major defects in an existing concrete base can compromise an overlay (Installing pavers over asphalt or concrete). Ask for finished elevations at doors, steps, foundation walls, and the lawn edge. Include a plan for downspouts and low spots instead of hoping joint sand will absorb the runoff.

If the proposal overlays existing concrete, require an inspection of cracks, height at thresholds, and drainage holes or edge drains where needed. Overlay can reduce excavation and disposal, but it can also raise the surface and create door or trip transitions. A low quote that excludes threshold changes is incomplete.

Price access and future maintenance

Measure gate width and identify whether aggregate deliveries can reach the work area. Ask whether the estimate includes pallet handling, equipment mats, haul-off, lawn protection, and cleanup. Request a written allowance for buried utilities, roots, or unstable subgrade. Before final payment, walk the perimeter and verify the paver pattern, borders, joint fill, drainage path, and disturbed-surface restoration.

Use the concrete patio cost article as a comparison only for the different assembly and finish choice; it does not replace a site-specific paver plan. Your next step is to give bidders one dimensioned sketch and require each to return the same assembly table. Compare base and drainage decisions first, then the paver color and total.