How to Read Grade Stakes and Cut and Fill Marks

The surveyor left a row of wooden stakes and lath across your lot, each one covered in marker scribbles like "C 1.4" and "F 0.8 @ 10' O/S." If the operator or you read one of those wrong, you end up with a pad 18 inches low or a swale that drains toward the house. Learning to read grade stakes takes about ten minutes, and it is the single cheapest way to avoid paying for the same dirt work twice.

I have been reading these marks from the seat of a dozer for over 25 years. Here is what each part means and how to check the numbers yourself before the first bucket of dirt moves.

What grade stakes are and why they matter

Grade stakes are survey markers that tell the grading crew how much to cut or fill at a specific point to hit the design elevation on the plan. They turn a contour drawing into instructions you can act on in the field. Without them, a crew is guessing, and guessing on a building pad means water problems later.

A typical residential layout uses three kinds of markers:

Hubs: short 2 by 2 stakes driven nearly flush with the ground. The top of the hub is the reference elevation the surveyor measured.
Guard stakes or lath: taller, thin stakes driven next to each hub, with the written information and colored flagging so you can find the hub.
Offset stakes: placed a set distance away from the actual work line so they survive the machines.

If you have not seen how the plan elevations are set, our guide to reading a topographic survey before you start grading covers that step first.

How to read grade stakes, mark by mark

Every surveyor has habits, but most use the same short codes. Here is a sample guard stake and what each line means.

Mark	Meaning
C 1.4	Cut 1.4 feet from the top of the hub to reach design grade
F 0.8	Fill 0.8 feet above the top of the hub
10' O/S	The stake is offset 10 feet from the point the number applies to
STA 1+50	Station 150 feet along a road or centerline from the starting point
FG or SG	Finish grade or subgrade, telling you which surface the number targets
CL, EP, TOE, TOP	Centerline, edge of pavement, toe of slope, top of slope

The number almost always refers to the top of the hub, not the ground beside it. That is the first mistake most homeowners make. If the hub sits 3 inches proud of the dirt and the stake says C 1.0, you dig 1 foot below the top of the hub, which is 9 inches below the surrounding ground.

Feet and tenths, not feet and inches

Survey numbers are in decimal feet. C 1.4 is 1 foot and about 4 13/16 inches, not 1 foot 4 inches. Converting is easy: multiply the decimal by 12. 0.4 times 12 is 4.8 inches. On a 40 by 60 pad, a misread of 0.4 inches per point adds up fast, so keep a conversion card in the truck.

Offsets

Offset stakes are the second big trap. If a stake reads "F 2.0 @ 15' O/S," the fill of 2 feet applies 15 feet away from the stake, usually toward the work along a line the surveyor marked with an arrow. Measure the offset with a tape along that line before you start.

Checking the numbers yourself

You do not need survey gear to sanity check the marks. A rotating laser level with a grade rod, which rents for $60 to $90 a day, is plenty.

Set the laser up on a tripod where it can see every hub on the pad.
Put the rod on top of the first hub and record the reading.
Do the same on each hub across the site.
Compare the differences between hubs to the differences between their cut and fill marks. If hub A reads C 1.0 and hub B reads F 0.5, the design surface should be 1.5 feet apart relative to those hubs.
Flag any hub where your reading is off by more than 0.1 foot and call the surveyor before work starts.

Hubs get knocked by equipment and kids more often than you would think. One nudged hub can throw a whole corner of a pad.

Why I do not trust "just grade to the stakes"

You will hear crews say they will simply grade to the stakes and be done. I push back on that. Stakes show grade at points, often 25 or 50 feet apart. Between them, the operator is still interpolating, and that is where low spots and birdbaths form. A pad can hit every stake within a tenth and still hold water in the middle.

The fix is to grade to the stakes, then run a laser across the surface on a grid every 10 feet before calling it done. That second pass takes an hour on a typical house pad and catches the dips while the machine is still on site. It is also part of why rough grading and finish grading are not the same job: the stakes get you close, the check gets you right.

Protecting the stakes during work

Ask the surveyor to set offset stakes outside the work area for anything critical, like the building corners.
Wrap guard stakes in bright flagging and tell every operator where they are on the first morning.
Take a photo of every stake with its writing visible before work begins. If one gets run over, you still have the number.
Budget for a resurvey. Replacing a handful of knocked stakes usually costs $300 to $600, which is far cheaper than pouring a slab on a pad that is off.

When the plan calls for both cut and fill on the same pad, read our explainer on cut and fill for a first time builder to see how the volumes balance out.

Frequently asked questions

What does C and F mean on a grade stake?

C means cut and F means fill. The number after the letter is how many feet, in tenths, to dig down or build up from the top of the hub to reach design grade. C 1.4 means remove 1.4 feet, F 0.8 means add 0.8 feet.

Are grade stake numbers measured from the ground or the hub?

They are measured from the top of the hub, the short stake driven nearly flush with the ground. The surrounding dirt can be higher or lower than the hub. Always measure from the hub top unless the surveyor writes otherwise.

How far apart are grade stakes usually set?

On residential lots, stakes are usually set every 25 to 50 feet and at every corner or change in slope. Roads and long swales often use 50 or 100 foot stations. Tighter spacing costs more but leaves less for the operator to guess between points.