Painting & Decorating·Exterior paint

How to paint the exterior of a house (2026)

Verified from sources

Quick Answer

To paint the exterior of a house properly, clean and repair the surface first, protect surrounding areas, prime any bare or unstable patches, then apply exterior paint in suitable weather using the method recommended for that surface. The finish lasts because preparation, compatible products and safe drying conditions matter more than simply putting on fresh paint.

Overview

Painting the outside of a house is mainly a preparation job. Good results come from starting with a sound, clean, dry surface, choosing an exterior paint that matches the substrate and any existing coating, and applying it in weather conditions the manufacturer allows. If you skip cleaning, scraping, repairs or primer where needed, the new paint can blister, peel or fail early even if the colour looks good at first. Most house exteriors follow the same basic sequence: inspect, wash, remove loose material, repair defects, sand and feather rough edges, mask and cover nearby areas, prime bare patches, then apply the topcoats in a logical order from top to bottom. Work around the house rather than jumping randomly, and keep a wet edge to reduce lap marks. Always check the paint label and technical data sheet for surface preparation, compatibility, spreading guidance, drying and recoating information, because these vary by product and climate. If the house is very tall, heavily weathered, previously coated with unknown paint, or may contain lead in old coatings, slow down and assess the risks first. A careful exterior paint job can protect the building fabric as well as improve appearance.

Who this is for

Homeowners and competent DIYers repainting masonry, render, timber trim or previously painted exterior surfaces in generally sound condition.

What you’ll need

Exterior paint suitable for the surface
Primer or stabilising primer if required by the surface condition or paint system
Filler or exterior repair compound suitable for the substrate
Scraper and stripping tools for loose paint
Sandpaper or sanding block
Brushes for cutting in and detailed areas
Roller and sleeves suited to the surface texture
Extension pole
Paint tray or scuttle
Bucket and clean water if the product instructions require it for cleaning or prep
Mild detergent or exterior cleaner suitable for the surface
Stiff brush or soft wash equipment as appropriate
Dust sheets, masking tape and protective coverings
Caulk or exterior sealant if gaps need sealing
Ladder or access equipment suitable for the job
Personal protective equipment such as gloves, eye protection and suitable respiratory protection when sanding or scraping

Before you start

Check the substrate type, the condition of the existing coating, and whether the surface is dry and stable enough to paint. Read the paint manufacturer’s label and technical data sheet for permitted weather conditions, drying and recoating guidance, coverage expectations, primer compatibility and application method. If the house was painted many years ago, especially before modern restrictions on lead, treat old paint with caution and follow official guidance on testing and safe removal. Also check access, neighbour boundaries, and whether overspray, runoff or ladder placement could create a risk.

Step-by-step

1
Inspect the exterior and plan the work
Walk around the house and identify the surfaces to be painted, any peeling or chalking areas, rotten timber, cracks in render, failed sealant, mould or algae, and spots where water is getting in. Decide whether you are repainting like for like or changing paint type, and confirm that the chosen paint is suitable for masonry, wood, metal or mixed surfaces as needed. Plan the order of work so high sections, eaves and trim are accessible before lower walls and paths are in use again.
Why: Inspection tells you whether painting is actually the right remedy. Paint will not solve damp, rot, movement cracks or failing old coatings; those need attention first or the new finish will fail.
2
Clean the surface thoroughly
Remove dirt, dust, cobwebs, chalking residue, biological growth and any loose contamination. Use a cleaning method that will not damage the substrate or force excess water behind cladding, trim or render. Rinse if the cleaner requires it, then allow the surface to dry fully before moving on.
Why: Paint sticks to sound, clean surfaces. Dirt, chalk and organic growth act as a weak layer between the old surface and the new coating, leading to poor adhesion and patchy finish.
3
Remove loose paint and make repairs
Scrape off flaking or blistered paint, cut back unstable edges, sand rough transitions, and repair defects such as small cracks, minor surface damage, and failed caulked joints where an exterior sealant is appropriate. Replace decayed timber or badly damaged sections rather than coating over them. If you suspect lead paint, stop dry sanding or uncontrolled scraping and follow official safety guidance.
Why: New paint only lasts as long as the layer underneath it. Feathering edges and fixing defects creates a stable base and helps the finished coat look even instead of telegraphing old damage.
4
Protect adjacent areas and set up safe access
Cover paths, plants, windows, fittings and anything you do not want splashed. Mask neatly where needed, but avoid taping onto weak or dirty surfaces that may lift. Position ladders or other access equipment securely on stable ground, and keep tools organised so you are not overreaching while painting.
Why: Protection reduces cleanup and accidental damage, while proper access lets you apply paint evenly and safely instead of rushing awkward sections.
5
Prime bare, repaired or problem areas
Apply the correct primer or stabilising product to any bare substrate, porous repairs, weathered timber, stained spots or chalky areas if the paint system calls for it. Use the manufacturer’s guidance to match primer to substrate and topcoat. Let primer dry as directed before painting over it.
Why: Primer improves adhesion, evens porosity, helps hide repaired patches and can block certain stains. On unstable or very absorbent surfaces, it often determines whether the topcoat bonds properly.
6
Apply the exterior paint in a controlled sequence
Stir the paint well, then start at the top of the house and work down. Cut in around edges and details, then fill larger areas with a roller or the application method recommended for that product. Maintain a wet edge, work in manageable sections and avoid painting in unsuitable sun, wind, rain or damp conditions. Apply the number of coats stated by the manufacturer rather than trying to force full coverage in one heavy coat.
Why: Working top to bottom controls drips and keeps the finish consistent. Correct coat thickness and suitable weather allow the paint film to cure properly, giving better colour, durability and resistance to peeling.
7
Check coverage, remove masking and clean up carefully
Once the final coat has reached the stage recommended for handling, inspect for missed spots, thin areas, runs or flashing. Touch in only where needed, remove masking carefully, clean tools according to the product instructions and dispose of waste paint, contaminated debris and washings responsibly under local rules.
Why: A final inspection catches defects while they are still easy to correct. Proper cleanup also protects drains, soil and surrounding surfaces.

Why this works

Exterior paint performs best when it forms a continuous, well-bonded film over a stable surface. Cleaning removes bond-breakers, repairs remove movement and failure points, primer manages porosity and adhesion, and applying the right product in the right conditions allows the coating to dry and cure into a durable protective layer.

Common mistakes to avoid

Painting over dirt, chalking, algae or loose paint
Skipping primer on bare patches, repairs or porous surfaces that need it
Painting in unsuitable weather or on damp walls
Applying heavy coats instead of the recommended coat system
Using interior paint or the wrong exterior paint for the substrate
Ignoring the cause of peeling, such as trapped moisture or failed sealant
Overreaching on ladders instead of moving them properly
Dry sanding old paint without checking for lead risk

Troubleshooting

Paint is blistering or peeling soon after application

Check for moisture problems, poor preparation, incompatible coatings or painting in poor weather. Remove failed areas back to a sound edge, correct the underlying cause, reprime if needed and repaint.

Patchy sheen or visible lap marks

Work smaller sections, keep a wet edge and avoid letting one area dry before the next overlaps. A further uniform coat may be needed once conditions are suitable.

Paint soaks in unevenly on repairs or bare spots

Those areas usually need the appropriate primer or extra preparation before topcoating. Follow the manufacturer’s system for porous surfaces.

Runs and sags

The coat was likely too heavy or applied in awkward conditions. Brush or roll out runs while still workable; once dry, sand smooth if appropriate and recoat lightly.

Mould or algae reappears through the finish

Clean and treat the contamination properly before repainting, and address shade, poor drainage or persistent damp where possible.

Compare your options

Brush and roller

Best for: Most DIY exterior repainting, especially masonry and trim

Pros: Good control, less overspray, easier on smaller jobs and around details

Cons: Slower on very large areas and textured surfaces

Airless sprayer

Best for: Large areas where masking and overspray control are manageable

Pros: Fast coverage and can handle some textured surfaces efficiently

Cons: Requires more masking, more skill, and greater risk of overspray and uneven application if used badly

Trade painter or decorator

Best for: Tall houses, extensive repairs, time-sensitive work or uncertain substrate conditions

Pros: Quicker completion, better access solutions, and experienced preparation

Cons: Higher labour cost and quality depends on contractor choice

Option	Best for	Pros	Cons
Brush and roller	Most DIY exterior repainting, especially masonry and trim	Good control, less overspray, easier on smaller jobs and around details	Slower on very large areas and textured surfaces
Airless sprayer	Large areas where masking and overspray control are manageable	Fast coverage and can handle some textured surfaces efficiently	Requires more masking, more skill, and greater risk of overspray and uneven application if used badly
Trade painter or decorator	Tall houses, extensive repairs, time-sensitive work or uncertain substrate conditions	Quicker completion, better access solutions, and experienced preparation	Higher labour cost and quality depends on contractor choice

Alternatives

Hire a professional painter for difficult access, extensive preparation or mixed substrates
Use a specialist stabilising or renovation coating system if the existing exterior surface is sound but heavily weathered, subject to manufacturer guidance
Delay painting and repair building defects first if damp ingress, rotten joinery or structural cracking is present

Pro tips

Box together paint from multiple cans of the same colour before starting a wall to reduce shade variation.
Paint shaded elevations first if strong sun moves across the house during the day.
Do prep and repairs more carefully than feels necessary; they usually decide how long the finish lasts.
Keep separate brushes for water-based and solvent-based systems if the manufacturer offers both.
Label leftover paint with the surface used on and the date for future touch-ups.

Safety notes

Follow ladder and work-at-height safety guidance and do not overreach.
Wear eye protection when scraping, sanding or cleaning overhead areas.
Use suitable respiratory protection if dust, old coatings or spray mist may be present.
Treat old exterior paint as potentially hazardous until you know otherwise, particularly on older properties.
Keep paint, washings and debris out of drains, ponds and soil where local rules prohibit discharge.
Read the product safety data and label for ventilation, skin contact and disposal precautions.

Legal & regulatory notes

Requirements vary by country and locality. Older paint may contain lead, and removal or disposal can be regulated. Waste paint, solvent residues, wash water and contaminated debris may need specific disposal methods. If you are in a listed building, conservation area, shared property, or using access equipment over a public space, check local authority rules and any lease or ownership obligations before starting.

What this guide does not cover: This guide covers general exterior house painting practice and does not replace the instructions for a specific paint system, access equipment training, lead-paint safety procedures, or diagnosis of underlying building defects such as damp or structural movement.

Cost considerations

Material cost depends mainly on surface condition, the type of exterior paint, whether primer and repairs are needed, and how much masking and access equipment the job requires. Good preparation often reduces long-term cost because premature failure usually means redoing labour-intensive stages rather than just buying more paint.

Prefer to hire a professional?

If this job is beyond a confident DIY — or the work needs to be done by a licensed professional — you can find a verified painter or decorator through Trade Directory (tradedirectory.co.nz), New Zealand's directory of real, verified trade businesses. Compare local tradespeople, read their details and request quotes before you commit.

Find a painter or decorator on Trade Directory

Frequently asked questions

Do I always need primer on exterior walls?+

Not always on sound, previously painted surfaces if the topcoat system allows direct recoating, but bare patches, repairs, porous areas, chalky surfaces and some substrate changes often do need a primer or stabiliser. Check the paint manufacturer’s instructions for your exact surface.

Can I paint over old exterior paint?+

Yes, if the old coating is sound, clean, well-adhered and compatible with the new paint. If it is peeling, powdery, blistered or unknown and unstable, remove failed material and prepare properly first.

What weather is best for exterior painting?+

Use the conditions stated by the paint manufacturer. In general, avoid rain, heavy dew, very damp surfaces, strong wind, and extreme heat or direct sun that makes the paint dry too fast.

Should I pressure wash the house before painting?+

Sometimes, but only if it is appropriate for the surface and done carefully. Aggressive washing can damage render, force water into the building fabric or lift weak coatings. A gentler cleaning method may be safer.

How do I know if old paint may contain lead?+

Age of property and previous coatings can be clues, but they are not proof. Use official guidance on lead paint safety and testing options in your country before sanding or disturbing old paint extensively.

Sources & references

Guidance on this page is traced to documented sources. Last checked 24 September 2026.

Health and Safety Executive · government
Supports caution around potential lead in old paint and the need for safe handling when disturbing older coatings.
Dulux Trade · manufacturer
Supports checking manufacturer guidance for surface preparation, compatible primers, application methods and drying or recoating instructions for exterior paint systems.
Crown Trade · manufacturer
Supports general best practice on exterior preparation, use of suitable products for substrate type, and following product data sheets.

The overall method changes slowly, but product-specific preparation, compatibility and drying guidance varies by manufacturer and can change.