How to Set Out a Driveway With a Laser Level (2026)
Aug 19, 2026
Setting out a driveway with a laser level gets the falls, kerb lines and sub-base depths right before a single barrow of stone gets tipped — get it wrong and you're digging out a finished driveway that pools water at the door.
- Use a rotary laser like the Grettz G60 to set one datum height across the whole driveway before pegging falls.
- Standard driveway fall is 1:60 to 1:80 away from the building — check this with the laser, not by eye.
- Stringline between pegs confirms edges and cross-falls before sub-base goes down — Buy the fall check now, not after concrete.
- Digital spirit levels catch small kerb and threshold errors a rotary laser can't fine-tune.
Why this matters
A driveway that looks flat but drains wrong is the most common callback in groundworks. Water tracking back towards a house or garage door usually traces back to one thing: nobody checked the fall with an instrument, they eyeballed it off a spirit level on a 2-metre board.
A rotary laser removes the guesswork because it throws one reference plane across the entire plot at once, not a metre at a time. Set up correctly, a kit like the Grettz G60 rotary laser level kit reads level or gradient to within a few millimetres over a 30-40 metre run, which covers most domestic driveways in one setup.
What you'll need
- A rotary laser with a self-levelling head and a receiver — for driveway falls, dual-slope models let you dial in gradient rather than chase it with pegs
- A tripod, tall enough to clear parked vehicles or skips on site
- A grade rod or telescopic staff to read the receiver height
- Timber pegs, a lump hammer and a permanent marker
- A 100m yellow stringline for marking edges and cross-falls between pegs
- A 50m steel surveyors tape measure for setting out distances and checking diagonal squareness
- A note of the finished floor level (FFL) or damp-proof course height from the drawings, or measured off the house if there are no drawings
Budget half a day for setting out on a standard driveway in 2026 conditions — longer if the plot slopes across more than one direction or ties into an existing patio.
The steps
1. Confirm your datum and fall direction
Before the laser goes anywhere, fix your finished level. Most domestic driveways sit 150mm below the damp-proof course, and the fall runs away from the building at 1:60 to 1:80 — roughly 15-20mm drop per metre. Get this wrong on paper and every peg you set afterwards is wrong too. Mark the DPC height clearly on a fixed point, like a wall or fence post, so you can check back against it at any stage.
Common mistake: working off a fall that ties into a drain or manhole cover without checking its actual invert level first — driveways set to a fixed fall alone can end up below the drain they're meant to connect to.
2. Position the rotary laser
Set the tripod where the beam has a clear line of sight to every corner of the driveway, ideally central and slightly elevated. Level the unit using its auto-level function and let it settle — most self-levelling rotary lasers lock within 30 seconds. Check the laser's own calibration if it's had any knocks in transit; a unit that's out by even 2-3mm at 10 metres throws every reading that follows.
Common mistake: setting up too close to one edge of the plot, which forces awkward staff readings on the far corners and increases the chance of misreading the receiver.
3. Establish your benchmark peg
Drive a peg at a known, protected point — often just inside the boundary — and shoot it with the laser to record its height relative to your DPC datum. This becomes the reference every other peg is measured against for the rest of the job, so mark it clearly and don't move it until setting out is finished.
4. Peg the perimeter at required heights
Work around the driveway boundary with the staff and receiver, driving a peg every 3-5 metres. At each peg, calculate the required finished level using your fall from step 1, then mark the cut or fill needed on the peg itself — most groundworkers write it straight on with a permanent marker (e.g. "-140mm"). This is the stage where a dual-slope rotary laser like the G80 earns its price, because it can hold two axes of grade automatically instead of you calculating cross-fall by hand at every peg.
Common mistake: pegging levels for the sub-base surface instead of the finished driveway surface — always subtract your build-up depth (typically 150-200mm for a block-paved drive) before marking the peg.
5. Run stringlines between pegs
With pegs set, run a stringline hut-to-hut around the perimeter and across any cross-falls. This gives you a visual line to dig to and lets a second person check for dips or humps without needing the laser receiver at every point. A bright stringline colour matters more than it sounds — yellow and pink show up clearly against wet soil and hardcore, where a faded twisted line disappears in low light.
6. Check diagonals and squareness
Before excavation starts, measure both diagonals of the plot with the steel tape. If the driveway is meant to be rectangular, the diagonals should match to within a centimetre or so over most domestic runs — anything more and one corner is out of square. Fix this now; it's far cheaper than re-cutting a kerb line after the sub-base is compacted.
7. Re-shoot levels after excavation, before sub-base
Ground moves once it's dug — stones get kicked into the cut, machine tracks compress unevenly, and pegs get knocked. Re-check every peg with the laser before the sub-base goes down, and again before the surface course. This second check is the single most skipped step and the reason driveways come out with a low spot that holds water after the first heavy rain in 2026.
Full method with FFL datums and corner readings for wider groundworks is covered in the guide to setting out a driveway and patio with a laser level.
Troubleshooting
- Receiver won't lock a clear signal in bright sun — move to a lower sensitivity setting if the unit has one, or shade the receiver window with a hand while reading; direct summer sun in 2026 washes out weaker beams at range.
- Pegs keep getting knocked or lost — drive them further from the working area, or double-peg critical corners so one loss doesn't cost you the whole reference.
- Stringline sags between long runs — tension it tighter and support it with an intermediate peg every 5-6 metres; sag of even 10mm reads as a false low point.
- Fall runs the wrong way after excavation — this almost always traces to a datum error at step 1, not a laser fault; re-check your DPC mark before blaming the instrument.
- Laser readings drift through the day — temperature swings of more than 10°C between morning and afternoon can shift a self-levelling head by a couple of millimetres; re-zero against your benchmark peg after lunch on hot days.
- Cross-fall inconsistent across the width — check the tripod hasn't sunk or shifted on soft ground; re-level and re-shoot rather than assuming the first pass was correct.
Tools and resources
- Grettz G60 rotary laser level kit — single-slope rotary laser suitable for most domestic driveways
- Grettz 50m steel surveyors tape measure — for setting out distances and diagonal checks
- Grettz 100m yellow stringline — high-visibility line for marking edges and cross-falls
- A digital spirit level for fine-tuning kerb heights and threshold transitions once the rotary laser has set the broad falls
What to do next
Once the levels are pegged and checked, the next job is confirming your rotary laser is holding true calibration before you commit to the sub-base — a unit that's drifted even 3-5mm over a 20-metre throw will put a driveway out of fall without you knowing until the rain shows it.
FAQ
What fall does a driveway need?
A driveway needs a fall of roughly 1:60 to 1:80 away from the building, which works out to 15-20mm drop per metre. Steeper falls of 1:40 are sometimes used on shorter drives to guarantee drainage.
Can you set out a driveway with a line laser instead of a rotary laser?
A line laser works over short distances of 8-10 metres but loses accuracy and visibility outdoors beyond that. For most driveways, a rotary laser like the Grettz G60 covers the full plot in one setup instead of multiple repositions.
How accurate does a laser level need to be for driveway setting out?
Aim for accuracy within 3-5mm over the full run of the driveway. Anything looser than that risks a visible dip or a fall that runs the wrong way once concrete or block paving is down.
Do I need a receiver with a rotary laser for driveway work?
Yes, for any distance beyond a few metres in daylight a receiver is required to pick up the beam accurately. Reading the beam by eye on a staff works indoors but fails outdoors in normal daylight.
How often should a rotary laser be calibrated for groundworks?
Check calibration before any job where a fall error would be costly, and formally recalibrate at least once a year or after any knock or drop. A 60-second on-site drift check before setting out catches most problems before they cost you a re-dig.
What's the difference between setting out a driveway and a patio?
A driveway needs a stronger sub-base and a fall calculated against vehicle loading, while a patio fall is usually gentler at 1:80 away from the house. Both use the same rotary laser setup method, just different depth and gradient figures.
Can one person set out a driveway alone?
Yes, with a self-levelling rotary laser and receiver one person can peg an entire driveway alone, since the laser removes the need for a second person holding a level line. A second pair of hands still speeds up stringline runs and diagonal checks.
One last thing
Most driveway drainage complaints in 2026 don't come from a bad laser reading — they come from skipping the re-shoot after excavation, when disturbed ground has already moved the levels you set an hour earlier.
