Ask any professional painter, and they’ll tell you the same secret: preparing house for painting correctly is the most critical stage of the entire project, often accounting for 70-80% of the total labour.
It’s the meticulous work done before a single can of paint is opened that separates a flawless, durable finish from one that peels, cracks, and fades within a year.
This guide provides the essential tips and techniques that professionals use to prepare a house for painting, covering both interior and exterior surfaces. Whether you’re a DIY enthusiast or want to understand what goes into a high-quality professional service, this checklist is for you.
Part 1: Interior Steps for Preparing House for Painting
Preparing your interior walls is all about creating a perfectly clean, smooth, and uniform canvas for the new paint.
Step 1: Clear the Space & Protect Everything
Remove all furniture from the room if possible. For large items that can’t be moved, push them to the center of the room and cover them completely with plastic sheeting or clean drop cloths. Remove all wall hangings, outlet covers, and light switch plates. Use drop cloths to cover the entire floor.
Step 2: Clean All Surfaces Thoroughly
Walls collect dust, grime, and oils that you can’t always see. These contaminants prevent paint from adhering properly. Wash all walls and trims with a solution of sugar soap or a mild detergent and water. For greasy areas like kitchens, a stronger degreaser may be needed. Rinse with a clean, damp cloth and let everything dry completely.
Step 3: Create a Flawless Surface (Repair & Sand)
Inspect every wall and ceiling for imperfections.
Fill cracks, holes, and dents with a suitable filler (spackle).
For larger repairs, you may need plaster compound.
Once the filler is completely dry, sand it smooth with fine-grit sandpaper (180-220 grit) until it’s flush with the wall.
Wipe away all sanding dust with a damp cloth.
Step 4: Tape for Crisp, Professional Lines
Using high-quality painter’s tape (like the blue or green varieties), carefully tape off the edges of skirting boards, window frames, door frames, and the ceiling line. Press the tape down firmly to prevent paint from bleeding underneath.
Step 5: Prime Where Necessary
Primer is a crucial base coat that ensures better adhesion and true colour. You must prime:
Any areas you’ve repaired with filler or plaster.
Walls with stubborn stains (water, smoke, ink).
When making a dramatic colour change, especially when you need to How to paint over dark colors on the wallspaint over dark colours.
Bare, unpainted surfaces like new drywall.
Part 2: Exterior Steps for Preparing House for Painting
Preparing a house exterior is a more intensive process focused on battling the elements to ensure the new paint withstands Melbourne’s weather.
Step 1: The Power Wash
The first step is a thorough cleaning to remove years of built-up dirt, grime, mould, and chalky residue. A pressure washer is the most effective tool for this. Use the appropriate nozzle and pressure to avoid damaging the surface. The house must then be left to dry completely, which can take 2-3 days.
Step 2: Scrape Away All Loose Paint
This is the most labour-intensive but vital step. Using paint scrapers and wire brushes, remove every bit of loose, cracked, or peeling paint. The new paint will only be as durable as the surface it’s sticking to.
Step 3: Sand for a Smooth Transition
After scraping, there will be clear edges between the old paint and the bare surface. Sand these edges to create a smooth, feathered transition. This will prevent the old paint lines from showing through the new coat.
Step 4: Repair Damaged Surfaces
Inspect all exterior surfaces for damage. This includes repairing or replacing rotten wood on window sills or weatherboards, filling cracks in render or concrete, and re-caulking gaps around windows and doors to create a weatherproof seal.
Step 5: Prime All Bare Spots
Any area where you have scraped down to the bare wood, render, or metal must be spot-primed with a high-quality exterior primer. This seals the surface, prevents moisture damage, and provides a strong foundation for the new paint to bond to. For more specialised surfaces, you may need to know specific Tips and tricks for preparing concrete for paint techniques for preparing concrete for painting.
Common Prep Problems & Pro Solutions
| Common Problem | Professional Solution | Tools Needed |
|---|---|---|
| Hairline Cracks | Fill with flexible spackle, sand smooth when dry. | Putty knife, Spackle, Sandpaper |
| Stubborn Stains | Apply a coat of stain-blocking primer before painting. | Stain-blocking primer, Brush/Roller |
| Peeling Paint | Scrape all loose sections, sand edges, and spot-prime. | Paint scraper, Sandpaper, Primer |
| Mould/Mildew | Wash with a bleach/water solution, rinse, let dry fully. | Sponge, Bleach, Water, Gloves |
Frequently Asked Questions
How clean do my walls really need to be before painting?
Very clean. Even invisible oils from fingerprints or dust can prevent paint from bonding properly, leading to premature peeling or blistering. A thorough wash is a small time investment that pays off in the longevity of your paint job.
Can I just paint over old paint without preparing the surface?
It is highly discouraged. If the existing surface is dirty, damaged, or glossy, the new paint will fail. At a minimum, you must clean the walls and scuff-sand any glossy surfaces to ensure the new paint can adhere.
Why is exterior preparation so much more work than interior?
Exterior surfaces are constantly exposed to UV rays, rain, wind, and temperature changes in Melbourne. The preparation must be far more robust to ensure the paint creates a protective shell that can withstand these harsh elements for years to come.
