Why not to go for the cheapest driveway contractor

A driveway quote that comes in 30 or 40 percent below everyone else looks like a win. It almost never is. The reason it is cheaper is rarely down to a contractor being more efficient or finding clever savings. It is down to corners being cut on the parts of the job a homeowner cannot see. Five years in, when the bargain driveway starts cracking, sinking, sprouting weeds along the edge and developing potholes after a wet winter, the cheap quote turns out to have been the most expensive one.

Delaney Tarmac is usually called in to lift bargain installs and start again. Paul Delaney, who has been laying driveways across Kildare and Dublin since the early 1980s, puts it simply.

"There is a perception that resin or porcelain is just a finish you bolt onto an existing surface. It is not. The base is everything. If the sub-base is wrong, the whole thing fails inside three years. We are usually called in to lift bad jobs and start again. That is not how we want to be working."

Paul Delaney

Below are five places a discount driveway quote almost always cuts corners. Knowing what to look for is the difference between buying a driveway that lasts 20 years and one that needs replacing in 5.

1. The sub-base depth

The sub-base is the compacted hardcore layer underneath the visible surface. It carries every car that ever parks on the drive. A proper residential driveway sub-base goes a minimum of 150 to 200mm deep, laid in compacted layers using a vibrating roller. On Dublin boulder clay or Bog of Allen edge ground, it goes deeper, with a woven geotextile separation layer to stop the hardcore migrating into the wet subsoil over time.

A bargain quote typically goes thin. 50 to 75mm of crushed stone, lightly raked, no proper compaction. The surface looks fine on day one. Then the first cold winter pushes water down into the under-compacted layer, the layer settles, the surface follows it down, and within two or three years the cracks appear.

2. Machine-laid versus hand-laid tarmac

Hot SMA tarmac (Stone Mastic Asphalt) needs to be machine-laid by a paver, then compacted by a roller while still hot. That is what gives the tight, factory-smooth finish people picture when they say tarmac driveway. Hand-laid tarmac never compacts evenly and never runs true to a level. The give-away is a patchy grey appearance and ridges visible in raking light.

Discount contractors often hand-lay because they do not own a paver and do not want to hire one. The cost of the machinery is a real one, but spreading it across a year of work is what a serious contractor builds into their pricing.

3. Edge restraint

A tarmac driveway needs something to hold its edge in. Concrete haunching is the minimum. Granite setts or kerbstones are the proper finish. Without an edge restraint, the tarmac crumbles outward under turning vehicles. Within a year the edges are uneven and weeds grow into the gaps. By year three, the surface is failing inward from the edges.

Cheap quotes regularly skip edge restraint entirely or use a quick line of mortar that fails inside two years. A granite sett border is a small upgrade on the overall driveway cost. It is also the single most visible detail on the finished job.

4. Drainage falls

A driveway must drain water away from the house, not towards it. Falls are set at the sub-base stage, before the surface is laid. Done properly, water runs off in a defined direction to a soakaway, channel drain or road gully. Done badly, water sits on the surface, freezes in winter, and starts breaking the tarmac apart through frost cycles. On a flat plot, getting the falls right takes time. Cheap quotes skip this and rely on the natural slope of the ground, which is often wrong.

Since 2019, Dublin City Council, South Dublin, Fingal and Dun Laoghaire-Rathdown have all tightened their Sustainable Urban Drainage (SuDS) requirements for driveways larger than 5 square metres. A permeable resin bound surface or a properly drained block paving install meets these requirements. A non-compliant install does not, and councils have increasingly been requesting evidence of compliance on new builds and major front-garden works.

5. Insurance and own machinery

A contractor who owns their own paver, roller, mini-digger and tipper is investing in the trade long-term. They have public liability insurance that covers damage to your house, your neighbour's wall, your car. They have direct employees, not subcontractors who disappear after the job. They pay their VAT, file their accounts and would lose their reputation overnight if a job went wrong.

The cheapest quotes often come from operators who hire machinery by the day, hold limited or no insurance, and trade under a name that changes every couple of years. If the job fails, there is nobody to call. The original quote was cheap because that risk was never priced into it.

What to ask before you sign

Before you commit to any driveway contractor, ask the following four questions. If the answers are vague or evasive, get a second quote.

• What sub-base depth and material are you specifying for my site?
• Will the tarmac be machine-laid or hand-laid? What grade of asphalt or SMA?
• What edge restraint is included in the quote, and what does the finished detail look like?
• Are you fully insured, and do you have your own machinery and direct employees?

A proper driveway contractor will answer all four without hesitation, in plain English, with their phone in their pocket. A bargain operator will deflect, offer a discount, or get vague about the spec.