How to Paint Your House Exterior: Preparation, Paint Selection, and Application

When to Paint: Temperature and Weather

Exterior latex paint requires a surface temperature between 50 and 85 degrees Fahrenheit during application and for 4-8 hours after. Oil-based paint requires 40-90 degrees. Check the forecast for the day of painting and the two days following; rain within 8 hours of application washes wet paint off the surface and ruins the finish. Avoid painting in direct sun on surfaces above 90 degrees—the paint dries too fast, does not level properly, and leaves visible brush or roller marks.

The best painting conditions in most of the United States occur in late spring (May-June) and early fall (September-October). Summer works in northern climates where temperatures stay below 85 degrees, but afternoon heat in southern states makes mid-summer painting difficult. Start painting on the north-facing side of the house in the morning (the coolest side), then work clockwise around the house following the shade. This strategy keeps the paint surface in the optimal temperature range throughout the day.

Surface Preparation

Preparation determines the longevity of the paint job. Follow these steps in order; skipping any step reduces the life of the finish.

Pressure Washing

Rent a pressure washer rated at 2,500-3,000 PSI from Home Depot ($65 per day) or Sunbelt Rentals ($55 per day). Use a 25-degree tip (green) for general cleaning and a 15-degree tip (yellow) for stubborn mildew and grime. Hold the wand 12-18 inches from the surface and work in overlapping passes from bottom to top to avoid driving water behind the siding. Wash the entire house, including the soffits, fascia, gutters, and trim. Allow 24-48 hours for the wood or fiber cement to dry completely before painting. Painting over wet wood traps moisture and causes blistering and peeling.

Add a mildewcide concentrate like Jomax House Cleaner ($12 per bottle, makes 5 gallons) to the pressure washer detergent tank for houses with visible mildew, algae, or mold staining. Jomax kills the spores on contact and prevents regrowth through the new paint. Do not use bleach; bleach cleans the surface but does not kill mildew roots embedded in the wood grain, and the bleach residue interferes with paint adhesion.

Scraping Loose Paint

After the house dries, inspect every surface for loose, peeling, or flaking paint. Scrape all loose paint down to bare wood or to a sound paint edge using a stiff putty knife ($8, Hyde 05800) or a pull scraper ($18, Warner 540). For large areas of peeling paint on wood siding, use a paint scraper with a carbide blade ($22, Red Devil 3212) that stays sharp through hours of scraping. Work in the direction of the wood grain to avoid gouging the wood.

For lead paint concerns: homes built before 1978 may contain lead-based paint. Buy a 3M LeadCheck test kit ($15 for a pack of 8) and test the paint chips. If the test is positive, do not dry-sand or scrape without a HEPA vacuum attachment and proper respiratory protection (3M 6001 lead-rated cartridges, $25 per pair). Hire a certified lead-abatement contractor for remediation, which costs $8-$15 per square foot.

Sanding

Sand all scraped areas and any rough or weathered spots with 80-grit sandpaper on a random orbital sander ($50, DeWalt DWE6411K). Sanding feather the edge between bare wood and the surrounding painted surface so the transition is invisible under the new paint. Sand glossy areas on trim and siding with 120-grit to dull the sheen; new paint does not adhere well to a high-gloss surface. Wipe all sanded areas with a damp cloth to remove dust. Allow the surface to dry before priming.

Caulking and Patching

Caulk every gap and crack where water can infiltrate: where siding meets window and door frames, where trim meets siding, at corner boards, and at any split or open joints in the wood. Use a paintable silicone-acrylic caulk like DAP Alex Plus ($5 per tube) for gaps up to 1/4 inch, and a backer rod ($8 per 20-foot roll) plus caulk for gaps wider than 1/4 inch. Fill nail holes in siding and trim with exterior spackle ($8, DAP Plastic Wood). Patch rotted wood sections with a two-part epoxy wood filler ($25, Bondo Wood Filler) that cures in 30 minutes and can be sanded and painted.

Primer Selection

Primer creates a uniform, adhesive surface for the topcoat. You do not always need primer over existing paint that is in good condition, but bare wood, patched areas, and surfaces with significant color change always require primer.

Apply primer with a brush on trim and detailed areas, and a 1/2-inch nap roller on flat siding surfaces. One coat of primer covers bare wood adequately. Allow the primer to dry for the manufacturer's recommended time—typically 1-4 hours for latex primer and 8-24 hours for oil-based primer—before applying the topcoat.

Exterior Paint Selection

Exterior paint must withstand UV radiation, temperature swings from 0 to 110 degrees Fahrenheit, rain, wind-driven debris, and mildew growth. The two primary categories are 100% acrylic latex and oil-based alkyd. Acrylic latex accounts for 90% of residential exterior paint sold in 2026 because it is easier to work with, dries faster, flexes with the wood as it expands and contracts, and resists fading better than oil-based paint. Oil-based paint provides a harder, smoother finish but becomes brittle over time and cracks as the wood moves.

Top-Rated Exterior Paints (2026)

• BENJAMIN MOORE Regal Select Exterior ($65/gallon): The benchmark for exterior acrylic paint. Self-priming on most surfaces, excellent hide, and a 10-year warranty. Available in 3,500+ colors. Best overall choice for wood and fiber cement siding.
• Sherwin-Williams SuperPaint Exterior ($55/gallon): Strong all-around performer with good coverage and mildew resistance. Available at Sherwin-Williams stores (not big-box retailers). 8-year warranty.
• Sherwin-Williams Emerald Exterior ($75/gallon): Premium line with superior fade resistance and a self-cleaning technology that sheds dirt with rainfall. 10-year warranty. Best for high-sun exposures.
• BEHR MARQUEE Exterior ($48/gallon at Home Depot): Best value among big-box brands. One-coat coverage on properly primed surfaces. 8-year warranty. Available in Home Depot's color-matching system.
• Valspar Duramax Exterior ($42/gallon at Lowe's): Budget-friendly option with adequate performance for mild climates. 6-year warranty. Thinner consistency requires more careful application to avoid drips.

Sheen Selection

Flat (matte) finish hides surface imperfections but is harder to clean. Satin finish offers a slight sheen that resists dirt pickup and cleans with a garden hose. Semi-gloss provides the highest durability and easiest cleaning but highlights every surface flaw. For siding, use satin or low-luster eggshell. For trim, doors, and shutters, use semi-gloss. For stucco and masonry, use flat to hide the textured surface irregularities.

Application Technique

Order of Painting

Paint in this sequence to avoid touching wet surfaces: start with the soffits and fascia (overhead, hardest to reach), then the siding, then the windows, then the doors, then the trim. Finish with the shutters, railings, and any decorative elements. This top-to-bottom, background-to-foreground order ensures that any drips or spatter from upper work are covered when you paint the lower surfaces.

Brushing vs. Rolling vs. Spraying

For a DIY painter, the combination of brushing and rolling produces the best results. Spray application requires an airless sprayer ($300-$600 to buy, $80-$120 per day to rent from Home Depot) and extensive masking of windows, doors, light fixtures, and landscaping. Spraying covers large areas quickly but leaves a thinner coat than brushing or rolling, often requiring a back-roll (rolling over the sprayed surface) for adequate film thickness.

Use a 4-inch flat brush ($12, Purdy XL Glide) for cutting in along trim, windows, and corners. Use a 1/2-inch nap roller ($8, Wooster Pro Doo-Z) on an extension pole ($20, Wooster Sherlock) for siding. The 1/2-inch nap holds enough paint to fill the texture of wood siding and fiber cement without leaving roller marks. Roll in a 3-foot by 3-foot W pattern, then fill in the W with vertical strokes from top to bottom. This technique distributes the paint evenly and eliminates lap marks.

Two Coats Minimum

Apply two coats of finish paint regardless of the manufacturer's "one-coat" claims. One-coat coverage works under laboratory conditions on perfectly primed, smooth surfaces. In the real world, two coats provide uniform color, better hide, and a thicker film that resists fading and weathering. Allow 4-6 hours between coats for acrylic latex paint. Lightly sand any rough spots between coats with 220-grit sandpaper and wipe with a damp cloth.

Trim and Detail Work

Paint window trim, door frames, fascia boards, corner boards, and shutters with a 2-1/2-inch angled sash brush ($14, Purdy Clearcut). An angled brush gives you better control for cutting straight lines along window glass and door edges. Apply semi-gloss paint in thin, even coats. Two coats on trim provide a durable, washable surface that resists dirt and mildew. For windows, use a painter's tool ($8, 5-in-1) to scrape any paint off the glass before it cures fully—latex paint peels off glass easily within the first 24 hours with a razor blade scraper.

Material Quantities for a 1,500 sq ft Single-Story House

Professional painters charge $2,500-$5,000 for labor on a single-story house of this size, bringing the total to $3,400-$6,400. The DIY approach saves 40-60% of the total cost. A quality exterior paint job increases home value by 1-3% at resale and significantly improves curb appeal, which accelerates the sale process.

Errors That Ruin an Exterior Paint Job

Painting Over Mildew Without Killing It

Mildew grows through paint within months if the spores are not killed before painting. Wash mildewed areas with a solution of 1 cup Jomax per gallon of water, scrub with a stiff brush, rinse thoroughly, and allow to dry. If the mildew staining persists after cleaning, prime with Zinsser Mold Killing Primer ($30/gallon) before applying the topcoat.

Painting in Direct Sunlight

Paint applied to a sun-heated surface dries too fast. The paint film does not level, leaving visible brush strokes, roller stipple, and lap marks. The rapid drying also traps solvents in the paint film, causing premature blistering. Paint the south and west sides of the house in the early morning or late afternoon when the sun is off the surface.

Skipping Primer on Bare Wood

Bare wood absorbs paint like a sponge. Without primer, the first coat of paint soaks into the wood fibers and leaves a thin, uneven film that fails within a year. Primer seals the wood pores, provides a uniform surface for the topcoat, and improves adhesion by 300-400% compared to paint applied directly to bare wood.

Using the Wrong Roller Nap

A 3/8-inch nap roller leaves a thin coat on rough surfaces like wood siding and stucco. A 3/4-inch nap roller holds too much paint and creates excessive texture (orange peel) on smooth surfaces. Match the nap to the surface: 1/2 inch for wood and fiber cement siding, 3/4 inch for stucco and rough-sawn cedar, and 3/8 inch for smooth trim and doors.

Not Back-Brushing After Spraying

Spraying alone pushes paint onto the surface but does not work it into the pores and crevices of the siding. Back-brushing (brushing over the sprayed surface immediately after application) forces the paint into the wood grain, improves adhesion, and creates a uniform film thickness. If you spray without back-brushing, expect 2-3 years less life from the paint job.

Cleanup and Long-Term Maintenance

Clean brushes and rollers immediately after use. For acrylic latex paint, wash with warm water and dish soap until the water runs clear. For oil-based paint, clean with mineral spirits ($8 per gallon) and dispose of the used solvent at a hazardous waste collection site—never pour it down a drain or onto the ground. Store leftover paint in a cool, dry location. Label each can with the room, surface, and date using a permanent marker. Properly stored latex paint lasts 10+ years for touch-ups.

Wash your painted exterior once a year with a garden hose and a soft-bristle brush to remove dirt, pollen, and mildew spores. Annual washing extends the life of the paint by 2-3 years by preventing the buildup of contaminants that degrade the paint film. Inspect the paint for cracking, peeling, or fading every spring. Touch up small problem areas immediately before they spread. A 30-minute touch-up in April prevents a $3,000 repaint in September.