How to Build a Driveway Extension: Pavers or Gravel, Step by Step

Extending a driveway yourself: $1,440–$1,840 in base stone, surface and a compactor, 16–26 hours of base work.

Before you start

Read the cost comparison first if the material isn’t decided. Pavers save the most ($1,575 on a 10×20) and this guide is written for them; gravel is the same base work with a simpler top, and the steps note where it differs. Concrete is a slab with a tie-in — the concrete slab guide covers the pour, and the cost page covers whether the $560 saving is worth it. Asphalt isn’t a DIY material: hire a crew.

Two conditions before you commit: the city and the HOA have said yes, and you have somewhere to put 5–6 cubic yards of soil.

What you need

For a 10×20 paver strip: 3.7 cubic yards of 3/4-inch minus crushed stone delivered, geotextile fabric, 60 ft of paver edge restraint with spikes, 0.6 cubic yards of concrete sand for bedding, 220 sq ft of vehicular-rated pavers (10% over), and polymeric sand. Tools: a plate compactor rental for two days, a wet saw or splitter rental for one, a rubber mallet, two 1-inch screed pipes and a straight 2×4, a 4 ft level, mason’s line, and gloves and knee pads. The priced list is on the cost page.

The two things that decide how it turns out

The base. Six inches of crushed stone compacted in lifts on firm subsoil is what makes a paver extension carry a car for twenty years. Thin the base, skip a lift, or compact on soft ground and the pavers sink where the tires stop. It’s the least visible part of the job and most of the work.

The tie-in. The new surface meets the old at exactly its height and pitch, and drains away from the house. Set the string line off the existing edge before you dig, check it after the base, again after screeding, and again with a hose at the end. An extension that’s a half-inch high at the joint is one you’ll notice every day.

Step by step

1. Check the rules and mark the layout

   Ask the zoning office about impervious-cover limits, driveway width at the street and side setbacks; ask the HOA about material and layout. Call 811 for utility marks. Stake the footprint, square it by checking the diagonals, and run a mason's line off the existing driveway edge at its height so you know exactly where the new surface must finish.

2. Excavate

   Dig 9–10 inches below the finished surface for pavers (8 for gravel) across the whole footprint plus 6 inches beyond the edge. Remove all topsoil, roots and anything soft; the base needs firm subsoil. A 10×20 strip is 5–6 cubic yards of soil — spread what you can, and plan a dump run or a bagster for the rest. Slope the bottom of the excavation the same way the surface will pitch, away from the house.

3. Lay fabric and build the base

   Roll geotextile fabric over the subsoil, lapped 12 inches. Spread 3/4-inch minus crushed stone in 2-inch lifts, dampening each and running the plate compactor in two directions until it stops moving. Six inches compacted for pavers or gravel. Check the base with a straightedge and the string line: it should be flat, at the right depth everywhere, and pitched 1/8–1/4 inch per foot away from the house.

4. Set the edge restraint

   For pavers, spike plastic or aluminum edge restraint along every edge that isn't the house or the existing driveway, sitting on the compacted base, before you lay. For gravel, drive steel or heavy plastic edging along the same edges, top edge 1/2 inch above the finished stone. Along the existing driveway, the old slab is the restraint — the base has to run tight to it.

5. Screed the bedding sand (pavers)

   Lay two 1-inch screed pipes on the base, parallel to the existing driveway, and spread concrete sand between them. Draw a straight 2×4 across the pipes to leave an even 1-inch bed. Lift the pipes, fill the grooves, and don't walk on the screeded sand. Work in sections you can lay the same day.

6. Lay the pavers

   Start at the existing driveway edge and a corner, and work outward in the pattern you chose, placing each paver straight down and sliding it against its neighbor — don't drag it through the sand. Keep lines straight with a string every few courses. Leave cuts for last. For a gravel surface, skip to spreading 2 inches of top stone instead, raked level and compacted.

7. Cut the edges

   Mark the pavers that overhang the restraint, the house or a curve, and cut them with a rented wet saw or a paver splitter. Set them tight. Any gap wider than a joint at an edge is where the field will start to move; fill it with a cut piece, not sand.

8. Compact and sand the joints

   Sweep the surface clean, run the plate compactor over the laid pavers (a rubber mat or a sheet of plywood protects the faces) in two directions to seat them into the sand. Sweep polymeric sand into the joints until full, sweep the surface clean of every grain, compact once more, then mist with water per the bag's directions to activate the binder. Keep cars off for 24–48 hours.

9. Finish the edges and drainage

   Backfill soil or mulch against the outside of the edge restraint so it's hidden and supported. Run a hose on the new surface and watch where water goes — it should leave along the pitch, not pool at the joint with the old driveway or against the house. Gravel: rake, compact, and plan to top up every two or three years.

What would this cost you? The driveway extension calculator prices the DIY version with the tools you already own and a value on your time, next to a pro quote.