This guide covers selecting the right house number hardware, determining optimal placement for street visibility and code compliance, laying out numerals with consistent spacing, and fastening or adhering them to brick, stucco, fiber-cement siding, stone, or wood. Done correctly, the job takes under two hours and the result is permanent and weather-resistant.
House numbers have a functional requirement beyond aesthetics: they must be legible from the street for emergency responders. Most jurisdictions specify minimum numeral height (commonly 4 inches), contrasting finish to the mounting surface, and illumination if the approach is not street-lit. Verify local requirements before purchasing — some municipalities require illuminated numbers on homes set back more than 50 feet from the street.
Time: 1–2 hours. Cost: $20–$150 depending on numeral style and size. Difficulty: Beginner. Permit required: No — verify local ordinances for size and illumination requirements.
What You Will Need
Tools
Tape measure
Level — torpedo or 2-foot
Pencil
Drill with appropriate bit (carbide-tipped masonry bit for brick, stucco, or stone; standard twist bit for wood or vinyl)
Hammer and nail set (if using mounting nails)
Painter's tape (for layout template)
Exterior-grade construction adhesive (for adhesive mounting)
Caulk gun
Materials
House number set — aluminum, stainless steel, or solid brass in the style and size required; minimum 4-inch numeral height for street visibility
Mounting hardware appropriate to the substrate: masonry anchors (3/16-inch × 1-1/4-inch minimum) for brick and stucco; stainless steel screws (1-5/8-inch minimum) for siding and wood; or exterior-grade VHB tape / Loctite PL Premium for adhesive mounting on smooth surfaces
Touch-up paint or exterior caulk to fill any old fastener holes
Exterior sealant (clear silicone) if the numerals mount through penetrations in a painted surface
Step 1 — Choose the Mounting Location
The mounting location must be visible from the street — specifically from the street in both directions of travel and from the driveway approach. Walk to the street and look at the house from 50, 75, and 100 feet away at different times of day. Note obstructions: parked cars, columns, plant material, overhang shadows. The numbers must be unobstructed from the street regardless of what vehicles are parked in the driveway.
Standard positions in order of preference: (1) beside the front door at eye level, 4–6 feet above grade; (2) on a column or pilaster framing the entryway; (3) on the face of the house at the roofline if a two-story entry obscures lower placement; (4) on a freestanding post at the driveway entrance if the house is set far back. Numbers on the mailbox alone do not satisfy most local codes — the house itself must be marked.
The mounting surface must be flat, stable, and protected from direct pooling water. Horizontal ledges and sill tops accumulate water, which accelerates corrosion of even rust-resistant hardware. Mount on vertical surfaces only.
Step 2 — Determine Size and Spacing
A general rule of thumb: for every 10 feet of setback from the street, use numerals 1 inch taller. A house 50 feet from the street should have numbers at least 5 inches tall; a house at the standard 25-foot setback needs 3-inch minimum, but 4-inch is the common code floor and is better practice regardless of setback. Numbers shorter than 4 inches are consistently cited in fire department after-action reports as contributing to delayed emergency response on residential calls.
Spacing between numerals: the visual gap between individual numbers should be one-third to one-half the numeral height. For 5-inch numbers, space them 1.5–2.5 inches apart. For consistency, measure the total span of the number set (width of all numerals + gaps), divide by the number of gaps, and establish a uniform gap measurement. Uneven spacing is the most common aesthetic error in house number installations and is entirely preventable with a two-minute measurement step.
Step 3 — Make a Paper Template
Cut a piece of paper or cardboard to the full width of the number set, with each numeral's position marked. Hold this template against the wall at the planned mounting height, step back to the street level (or have a second person do so), and confirm visibility, level, and visual balance relative to the door, trim, and other elements. Adjust height and horizontal position as needed before making any holes. This step costs five minutes and eliminates the need to patch misplaced holes in brick or stucco.
Step 4 — Mark the Hole Positions (Screw Mounting) or Adhesive Zone (Adhesive Mounting)
For screw mounting: hold each numeral individually against the wall in its final position, confirm level, and mark through the mounting holes onto the wall surface with a pencil. Use painter's tape behind the numeral to protect the wall face. After marking, remove the numeral and connect the marks for each numeral with a line — verify the line is level across the full set before drilling.
For adhesive mounting: adhesive mounting is appropriate on smooth painted surfaces, smooth stucco, or fiber-cement siding. Clean the surface with isopropyl alcohol and let dry completely. Mark the numeral outlines with painter's tape — the tape defines the adhesive zone and protects the wall surface from squeeze-out. Apply a bead of exterior construction adhesive (Loctite PL Premium or equivalent) in an S-pattern on the back of each numeral, avoiding the edges to prevent visible squeeze-out. Press firmly and hold for 60 seconds. Confirm level immediately — adhesive mounting is permanent within 30 minutes and cannot be repositioned after cure.
Step 5 — Drill the Holes (Screw Mounting Only)
For brick: use a 3/16-inch carbide-tipped masonry bit, drilling into the brick face (not the mortar joint — mortar anchors pull out easily). Drill to the depth of the anchor sleeve plus 1/4 inch. For stucco: use a 3/16-inch masonry bit, drilling slowly to avoid cracking the stucco coat — do not apply lateral pressure. For stone: use a carbide-tipped bit appropriate to the hardness; granite requires a hammer drill setting. For wood or fiber-cement siding: use a standard twist drill at 80% of the screw diameter for a pilot hole.
After drilling, blow out debris from the hole with a breath or compressed air can. Insert the masonry anchor sleeve (tap with a hammer to seat flush). Test the anchor by attempting to pull it out by hand — a properly seated masonry anchor resists 50+ lbs of pull force.
Step 6 — Mount the Numbers
Hold the numeral in final position, aligning the mounting pins or screws with the anchors. Drive the fastener snugly — firm contact with the wall face, no gap between numeral back and wall. Do not overtorque threaded fasteners: the mounting studs on cast aluminum and zinc die-cast numerals strip easily. For standoff-style numerals (mounted on pins with a gap between numeral and wall), verify the standoff length is consistent across all numerals before tightening fully.
After mounting each numeral, confirm level with a torpedo level placed across the top edge of the set. A single numeral that is visually off by even two degrees reads as wrong from the street.
Step 7 — Seal the Penetrations
For screw-mounted numbers on painted surfaces, apply a thin bead of clear exterior silicone around the base of each mounting fastener where it contacts the wall surface. This seals the drilled hole against water infiltration. Do not skip this step on painted wood siding — water running into an unsealed fastener hole causes paint failure and rot within 2–3 years. Wipe away excess silicone with a damp cloth before it skins over.
Common Mistakes
Numbers too small. Numbers under 4 inches are often non-compliant and are harder to read from a moving vehicle. Default to the largest size that looks proportional to the mounting surface.
Mounting in mortar joints on brick. Mortar anchors pull out. Drill into the brick face only.
Inconsistent spacing between numerals. Measure the gap; don't estimate it by eye. Uneven spacing is visible from 20 feet away.
Not leveling each numeral individually. Confirm level before any fastener is tightened fully — after tightening, correcting tilt on screw-mounted numbers usually requires patching the old holes.
Adhesive mounting on rough or unpainted masonry. VHB tape and construction adhesive need a smooth, non-porous surface to achieve rated holding strength. Use mechanical fasteners on rough brick, natural stone, and textured stucco.
Ignoring illumination requirements. If the house is set back more than 50 feet or the entry is unlit, local code may require illuminated numbers. Verify before mounting non-illuminated hardware.
When to Call a Pro
House number installation requires no professional help. The only scenario where professional involvement makes sense is illuminated number installation that requires running electrical conduit through an exterior wall — in that case, an electrician handles the wiring while you handle the numeral mounting itself.
House Number Materials — Full Comparison
The choice of house number material affects longevity, maintenance requirements, cost, and how the numbers read visually against different exterior finishes. The four most common materials in residential use each have distinct characteristics.
Cast aluminum: The dominant material for residential house numbers, accounting for over 70% of the market. Cast aluminum is lightweight (each numeral weighs 1–4 oz depending on size), does not rust, accepts powder-coat finishes in dozens of standard colors, and is available in an enormous range of font styles. The standard powder-coat finish (matte black, oil-rubbed bronze, polished nickel, satin stainless) is durable but not permanent — chips at mounting edges and impact points allow aluminum oxidation (not rust, but white powdery oxidation) to begin at the chip edge. Touch up with exterior metal paint in a matching color. Cast aluminum numbers are appropriate for virtually any residential installation at any budget level.
Solid brass: Dense, visually heavy, and with a warm gold tone that patinas to dark amber over years of outdoor exposure. Unlacquered brass patinas naturally and requires no maintenance — the patina is considered desirable by most buyers of brass hardware. Lacquered brass maintains its bright gold finish but requires periodic re-lacquering (every 5–10 years outdoors) to prevent uneven tarnish where the lacquer chips. Solid brass numbers cost 4–10× more than equivalent cast aluminum and are appropriate for high-end craftsman, traditional, and colonial architectural styles where the warmth of the metal reads as intentional rather than default.
Stainless steel: The most durable common material for house numbers. Grade 304 stainless resists corrosion in all weather conditions, including coastal environments where salt air corrodes aluminum and carbon steel aggressively. The finish is a brushed or polished silver-gray that complements contemporary and modern architectural styles. Stainless numbers do not require any maintenance in most climates. In coastal environments, rinse with fresh water annually to remove salt accumulation. More expensive than cast aluminum, less expensive than solid brass in most configurations.
Acrylic (plastic): The least expensive option and the one most likely to be found on new construction as a builder-grade default. UV-stable acrylic in matte black or white can look clean on the right surface, but degrades visually within 3–5 years outdoors — the surface becomes chalky, and impact chips expose white interior material that is visually prominent against dark finishes. Acrylic is appropriate as a short-term solution for rentals or before replacing with a permanent material.
Choosing Font and Size for Readability
Font choice for house numbers affects both legibility and the character of the installation. The key readability requirements are stroke width and character differentiation — numerals with very thin strokes and highly stylized forms may look distinctive from 3 feet but fail at 50 feet from a moving vehicle.
Font characteristics that optimize readability at distance: regular stroke width (not hairline), high contrast between stroke and counter (the enclosed spaces inside numbers like 0, 4, 6, 8, 9), clear differentiation between commonly confused pairs (1 and 7, 3 and 8, 6 and 9 in certain orientations). Sans-serif fonts (Helvetica, Modern, Century Gothic style) typically outperform serif or display fonts at distance because the serifs create visual noise that reduces legibility at small apparent size.
The relationship between numeral height and reading distance follows roughly a 1-inch-per-10-foot rule: 5-inch numbers are readable from 50 feet, 4-inch from 40 feet, and so on. For homes set back 100+ feet from the street, consider numbers 8–10 inches tall, which move from "decorative numeral" scale to "signage" scale — appropriate for these distances and often overlooked in residential installations.
Illuminated House Numbers
Illuminated house numbers fall into three categories: backlit panels (LED-lit acrylic or metal with laser-cut numerals, installed as a unit), individually illuminated numerals (each numeral contains an internal LED array), and passively illuminated (a separate fixture — an exterior light or soffit light — directed at the numbers from above or below). Each has distinct installation requirements.
Backlit and individually illuminated numbers require a low-voltage power connection or a standard 120V connection depending on the product. Most residential illuminated number systems are low-voltage (12V DC) driven by a small transformer that plugs into a standard outlet — installation is similar to low-voltage landscape lighting. Running wire to the mounting location requires either a surface conduit run from the nearest outlet or an in-wall wiring run, which requires an electrician if no existing wire is accessible at the mounting location.
Passive illumination using an existing exterior fixture is the simplest approach — no new wiring, no transformer, just repositioning or replacing the existing light fixture to direct illumination toward the number location. A motion-activated gooseneck light mounted above the number provides both security lighting and number illumination from a single fixture.
Mounting Surface Variations
House number mounting technique varies significantly by the substrate material of the exterior wall surface.
Mounting on Vinyl Siding
Vinyl siding panels are hollow and flexible — driving a screw into the face of a siding panel with no backing provides almost no holding strength. The correct method is to locate and fasten into the wall sheathing or stud behind the siding. Use a stud finder on the interior face of the exterior wall to locate the framing, then measure from the nearest window or door jamb to transfer the stud location to the exterior. Self-tapping stainless screws driven into plywood sheathing achieve 80–120 lbs pull-out strength — sufficient for any number. An alternative for vinyl siding when stud location is not possible: use a vinyl siding hook block (a plastic clip designed to snap under vinyl siding courses) to hang numbers on a bracket without penetrating the siding. These are not appropriate for large or heavy numbers.
Mounting on Stucco
Stucco over wire lathe over sheathing is a robust mounting surface when appropriate anchors are used. Standard stucco is 7/8 inch thick in a three-coat application. Drive a masonry bit through the stucco into the sheathing behind — the drill will transition from the hard resistance of stucco to softer plywood at the sheathing layer. For a screw that will seat only in the stucco layer, use a hammer drill with a 3/16-inch carbide bit and install a plastic sleeve anchor. Screws directly into a stucco-only hole will loosen within one freeze-thaw cycle. The stucco must also be spot-caulked around any penetration with elastomeric caulk to prevent moisture infiltration behind the wire lathe, which causes rust staining on the stucco face.
Mounting on Brick
Brick mounting requires a hammer drill with a carbide-tipped masonry bit. Drill into the mortar joint rather than into the brick face whenever possible — mortar is softer, easier to drill, and replaceable if the anchor is ever removed. Use a 1/4-inch sleeve anchor or a screw anchor (Tapcon is the common brand) rated for masonry. Tapcon screws in mortar joints achieve 300–500 lbs shear strength — far more than needed for house numbers. Pre-drill to exactly the diameter and depth specified on the Tapcon packaging — undersized holes bind the screw; oversized holes provide inadequate thread engagement. Apply masonry caulk around the penetration after fastening. Do not use expansion anchors (the type that require a nut and bolt) for house number mounting — they are overkill and require larger holes.
Mounting on Metal Cladding (Hardie, ACM)
Fiber cement siding (James Hardie and similar) and aluminum composite cladding are dense, hard substrates that hold standard stainless machine screws directly into a pre-drilled hole with minimal additional anchoring. Use a sharp HSS drill bit (not masonry) for fiber cement. A 3/16-inch pilot hole through fiber cement into the sheathing behind provides a strong anchor for 10-24 stainless machine screws. Seal all penetrations with color-matched fiber cement caulk.
Long-Term Maintenance
Aluminum and stainless steel house numbers require no maintenance beyond periodic cleaning — a damp cloth removes dirt and salt residue. Brass numbers require annual polishing with a brass cleaner unless a lacquered finish was specified. Painted cast-aluminum numbers should be inspected every two years for paint chips, which allow corrosion to begin at the exposed metal edge. Touch up with exterior metal spray paint in a matching color.
Inspect mounting fasteners annually. Over several freeze-thaw cycles, masonry anchors in brick and stucco can loosen as the masonry expands and contracts. Tighten any loose fasteners promptly — a number that comes partially off the wall creates a contact point that accelerates corrosion at the mounting site.
This guide covers selecting the right house number hardware, determining optimal placement for street visibility and code compliance, laying out numerals with consistent spacing, and fastening or adhering them to brick, stucco, siding, stone, or wood. The job takes under two hours and the result is permanent and weather-resistant.
What You Will Need
Tools: tape measure, torpedo or 2-foot level, pencil, drill with masonry or wood bit, painter's tape, caulk gun.
Materials: number set (min 4-inch height, aluminum/stainless/brass), masonry anchors or stainless screws, exterior construction adhesive (for smooth surfaces), clear silicone sealant.
Step 01 — Choose the Mounting Location
Walk to the street and look back at 50, 75, and 100 feet — identify obstructions from parked cars, plants, and shadows. Mount on a vertical surface beside the door at 4–6 feet above grade, on an entry column, or at the roofline if the entryway is recessed. Numbers on the mailbox alone do not satisfy most local codes.
Step 02 — Determine Size and Spacing
Rule of thumb: 1 inch of numeral height per 10 feet of street setback. Minimum 4 inches regardless. Space numerals one-third to one-half of numeral height apart. Measure the total set width, divide gap width equally — uneven spacing is visible from 20 feet and is the most common aesthetic error.
Step 03 — Make a Paper Template
Cut cardboard to the full width of the set, mark each numeral position, hold it at the planned mounting height, and check from the street before making any holes. This step takes five minutes and eliminates patching misplaced holes in brick or stucco.
Step 04 — Mark Positions
For screw mounting: hold each numeral, mark through the mounting holes, then connect marks and verify level across the full set before drilling. For adhesive mounting: clean the surface with isopropyl alcohol, mark the adhesive zone with painter's tape, apply adhesive in S-pattern, press and hold 60 seconds. Confirm level immediately — adhesive mounting is permanent within 30 minutes.
Step 05 — Drill the Holes (Screw Mounting)
Brick: carbide masonry bit, drill into brick face — not mortar joints. Stucco: slow, steady pressure to avoid cracking. Wood/fiber-cement: twist drill at 80% of screw diameter. Seat masonry anchor sleeves flush and test by hand pull before mounting numerals.
Step 06 — Mount and Level
Drive fasteners snugly — no gap between numeral back and wall, no overtorque (cast aluminum mounting studs strip easily). After mounting the full set, check level with a torpedo level across the top edge. A numeral off by two degrees reads as wrong from the street.
Step 07 — Seal Penetrations
Apply clear exterior silicone around each fastener base where it contacts a painted surface. Do not skip on painted wood siding — unsealed fastener holes allow water infiltration that causes paint failure and rot within two to three years.
Common mistakes: numbers too small; drilling into mortar joints on brick; inconsistent spacing; adhesive on rough masonry (use mechanical fasteners instead); skipping illumination check for set-back homes.
Maintenance
Aluminum and stainless: wipe clean annually. Brass: polish annually unless lacquered. Inspect fasteners each year for loosening from freeze-thaw cycles — tighten promptly to prevent corrosion at the mounting site.