Almost every address sign I see on a house is sized correctly for a person standing three feet away from it. That person already found the house. The sign had one job and it was finished before that.
This is the most common mistake in the entire category, and it is not a taste problem. It is arithmetic that nobody does before ordering.
The number you actually need
The working rule used in signage is roughly one inch of character height for every 25 feet of viewing distance, for numerals with clean contrast in daylight. That gives you a starting point rather than a guarantee, but it is close enough to order from.
- House sits 25 feet back from the curb: 3 inch numerals are the floor, 4 inches is comfortable.
- 50 feet back: 4 to 5 inches.
- 75 to 100 feet back, or a long driveway: 5 to 6 inches, and the sign belongs at the road, not on the house.
- Apartment or townhouse door on a walkway: 3 inches is fine, because the reader is already on foot and within fifteen feet.
Separately from readability, a lot of US municipalities set a legal minimum, commonly around 4 inches, and some require reflective or contrasting numerals. It varies by city and sometimes by fire district, so it is worth two minutes on your city website before you order. Emergency response is the reason those codes exist, and it is the reason I nudge people up a size when they are on the fence.
Contrast beats size
A 6 inch numeral in dark bronze against a dark brick wall is less readable at fifty feet than a 4 inch numeral in white against black. Your eye resolves edges, and an edge needs a value difference to exist at all.
Practical version: pick the sign color against the wall it is mounting to, not against the sample photo. Dark metal on light siding is excellent. Dark metal on red brick is a common and expensive mistake. If the house is dark, the sign needs a light backer plate behind the numerals rather than a lighter finish on the numerals themselves, because thin light lettering on a dark wall smears at distance.
Where it goes
Height first: 4 to 6 feet off the ground, which puts it in the natural sightline of a driver looking sideways out a car window. Higher than 6 feet and it leaves the field of view of anyone slowing down. Lower than 4 and it disappears behind a parked car, which happens on any street with curbside parking.
Position second, and this is the part people get wrong. The sign should be on the side of the house facing oncoming traffic, or dead center above the garage if the garage faces the street. Next to the front door is the intuitive choice and usually the worst one, because the front door is often set back inside a porch that blocks the angle entirely.
Third, light. Almost nobody arrives at an unfamiliar house for the first time in the middle of a bright afternoon. They arrive at seven in the evening. If the sign is not within the throw of a porch light or a path light, size it up one step and choose a finish with real value contrast, because at night your only tool is contrast.
Wall mount or ground stake
Both work. They solve different problems.
Wall mount is right when the house sits within about 50 feet of the road and the facade is visible from a moving car. It is permanent, it survives lawn equipment, and it does not move. It requires drilling into siding, brick or stucco, and on brick you want to drill the mortar joint rather than the brick face.
Ground stake is right for a long driveway, a house behind trees, a corner lot, or a rural address where the structure is not visible from the road at all. It is also the only reasonable choice if you rent, since it leaves no holes. The tradeoffs are real: it is a target for mowers and snowplows, and in a hard freeze zone you want the stake set deeper than feels necessary in October.
For a house behind any kind of screening, the ground stake at the driveway entrance is not a compromise. It is the correct answer, and a wall sign in that situation is decoration.
Name, number, or both
Numbers are functional. Names are hospitality. Both on one plate is common and it works, provided the number is the dominant element and the family name sits beneath it at maybe 40 percent of the numeral height. Flip that hierarchy and you have made a decorative name plaque that happens to include an address, which is a fine object and a poor address sign.
If the house itself has a name rather than just a number, that is a different design problem and I went through it in what to put on a sign for a house that has a name.
What survives outside
Laser cut steel at 1mm or heavier with a powder coat finish is the practical standard. It holds an edge, it does not fade the way printed material does, and it handles temperature swings without warping. Wood belongs indoors or under a deep covered porch, which I went into in which personalized signs hold up outdoors. Metal in a coastal salt environment needs a closer look at the finish, and there is more on that in can a metal monogram go outside.
The metal family name and address sign comes in 18, 27 and 36 inch widths, which maps roughly to the three distance bands above.
The short version
Measure from your curb to your front door, divide by 25, and that is your minimum digit height in inches. Then check the contrast against the actual wall, mount it between 4 and 6 feet on the side facing traffic, and if the house is not visible from the road, put it at the driveway instead. It is a small decision that a stranger, a delivery driver and possibly an ambulance all depend on. More outdoor pieces are in the housewarming collection.