Parking Lot Resurfacing Cost Calculator

With the defaults, a 20,000 sq ft lot that is milled and overlaid with 2 in of asphalt comes to $45,095. That is $9,000 of milling, $6,000 of base repair on 1,000 sq ft, $1,600 of tack coat, $25,375 for 241.7 tons of hot-mix asphalt, $900 to adjust two castings, $720 to restripe 60 stalls and $1,500 of mobilization, or about $2.25 per sq ft.

Asphalt is the biggest line, so thickness moves the price more than anything except the method. With the same mill and overlay, 1.5 in of asphalt brings the total to $38,751 ($1.94 per sq ft) and 3 in brings it to $57,783 ($2.89 per sq ft). Size matters too, because mobilization is a flat charge: a 10,000 sq ft lot with 30 stalls and one casting comes to $23,298 ($2.33 per sq ft), while a 50,000 sq ft lot with 150 stalls and five castings comes to $110,488 ($2.21 per sq ft).

A small job can hit the floor. A 3,000 sq ft overlay at 1.5 in with no patching, castings or striping adds up to $4,595, which the calculator raises to the $5,000 minimum job charge. Real quotes also depend on drainage work, traffic control, local asphalt prices and access, so use the pricing section to enter figures from a contractor.

A straight overlay paves a new layer over the existing surface. It is the least expensive method: the default lot comes to $36,095 ($1.80 per sq ft) because there is no milling. It suits a lot with a sound base and only light surface wear, where raising the grade by the new thickness will not cause problems at curbs, doors or drains.

A mill and overlay grinds off the worn top layer first, which removes surface cracking and lets the new asphalt go back at about the same grade. That is the usual choice when the curb reveal is already low, when water has to keep draining to the same inlets, or when the surface cracking is widespread. Milling adds $0.45 per sq ft, which is $9,000 on the default lot.

Full-depth reconstruction removes the asphalt and the base and rebuilds both. It is for lots with structural failure, such as alligator cracking, ruts and soft spots that keep coming back. The calculator prices it at $2.75 per sq ft, so the default lot comes to $85,095 ($4.25 per sq ft). It does not add a separate patching line, because the base is replaced across the whole area.

Overlays and mill and overlays only last when the failed spots underneath are fixed first. Base repair patching removes the weak asphalt and base in those areas and replaces them, and the calculator prices it per sq ft of repair at $6.00. The share of the lot you enter changes the total a lot: 0% brings the default job to $39,095, 10% to $51,095 and 20% to $63,095.

New asphalt raises or lowers the surface, so manholes, valve boxes and catch basins have to be adjusted to match. The calculator adds $450 for each casting. Restriping is optional at $12 per stall; for 60 stalls that is $720, and switching it off takes the default job to $44,375.

Full-depth work digs into the ground, so call 811 before it starts to have buried utility lines marked. The call is free.

Sealcoating and crack sealing are maintenance. They protect a lot that is still in good condition and slow its decline, but they do not add structure or fix a failed surface. Resurfacing is the next step up and is worth pricing once cracking is widespread, the surface is breaking up or the same areas keep failing.

FHWA describes preventive maintenance such as crack sealing as most effective when done in a timely manner before the pavement structure is damaged, and describes thin overlays as an option once pavement condition has become fair or poor. In practice that means timely crack sealing and sealcoating can put off a resurfacing, and once a lot has gone past that point, resurfacing or reconstruction is the repair that fits.

To decide, compare the cost per sq ft of each option over the years you expect the lot to last. The calculator shows the cost per sq ft for the resurfacing so you can put it next to a maintenance program.