From Bare Walls to Finished Spaces: The Complete Painting & Finishing Project Guide
The eight stages of a painting and finishing project, from assessing the walls to handover: when each is needed, what it costs and what to check.
- Evidence reviewed
- October 2026
- Surface methodology
- FGS-1
- Figures reviewed
- October 2026
- Estimator methodology
- interior-v3
- Quantity methodology
- quantity-v1
The short answer
A painting and finishing project runs in eight stages: assessment, surface readiness, skimming, undercoating or priming, choosing the finish, application, inspection and handover, then maintenance. Not every project needs every stage. A sound wall being repainted in a similar colour mostly skips straight from cleaning to two finish coats; new rough plaster can need all eight. The condition of each surface decides which stages apply, and that is what drives both the cost and how long the finish lasts.
This guide follows a project from first look to long-term care. Each stage explains what happens, why it matters, when it is needed, what it involves, what it does to cost and durability, what to check and the mistakes to avoid. It follows FinishGrid's published methodology: where a figure appears, it comes from the same calculations as the FinishGrid tools.
The eight stages at a glance
- Project assessment
Look at every surface, decide the scope and spot anything that must be fixed first.
- Surface readiness and preparation
Fix the causes of damp and damage, then get every surface dry, sound and clean.
- Skimming and levelling
Fill defects, and fully skim rough plaster where a smooth finish is wanted.
- Undercoating and priming
Apply the first coat a surface needs, and only where it needs one.
- Selecting paints and finishes
Match the paint and finish to the room, the surface, the weather and the upkeep you want.
- Paint and finish application
Apply the coats in order, with proper drying between them.
- Inspection and project handover
Check the finished work against what was agreed, and record what was used.
- Maintenance and long-term care
Clean gently, fix small problems early and find the cause of any new defect.
Which stages does your project need?
Stages 1, 5, 6, 7 and 8 apply to every project. Stages 2, 3 and 4 depend on the surface. Use this table to see which parts apply to each area of your house; one house often has several rows.
| Surface | 2. Readiness | 3. Skimming | 4. First coat |
|---|---|---|---|
| Previously painted, sound, similar colour | Clean and dull any shine | No | No: two finish coats |
| Previously painted, local defects | Clean, remove loose paint | Spot filling | One preparation coat |
| Previously painted, very different colour | Clean and dull any shine | No | An undercoat may be needed |
| Chalky or powdery old paint | Remove loose material | Spot filling if needed | Penetrating primer |
| New smooth plaster | Must be dry | No | One preparation coat |
| New rough plaster, smooth finish wanted | Must be dry | Full skimming | One preparation coat |
| New rough plaster, texture accepted | Must be dry | No | One preparation coat (uses more paint) |
| New exterior plaster | Must be dry and sound | Not part of FinishGrid's exterior systems | One coat of undercoat |
| Damp, a leak, or a crack of concern | On hold: fix or assess the cause first, then decide | ||
Not sure which row you are in? Check My Wall asks about one area at a time and shows its pathway. It is guidance, not a diagnosis.
Stage 1 of 8
Project assessment
Before anyone talks about colours or prices, walk round the house and look at what you are actually painting: which rooms, walls, ceilings, doors and outside walls, what each surface is made of and what condition it is in. This is the stage that decides everything after it. A wall that is already painted and sound needs a very different system from new rough plaster, a damp wall or flaking paint, and the budget follows the system.
When it's needed
Always. Even a "simple repaint" needs a quick check for damp, cracks and loose paint.
What it involves
- Listing the areas in scope: walls, ceilings, doors, window frames, exterior walls.
- Recording each area's surface: new plaster (smooth or rough), previously painted, board ceiling, wood or metal.
- Noting problems: damp patches, leaks, cracks, peeling, chalky or powdery paint.
- Measuring, or at least estimating, the wall and ceiling areas.
Cost, quality and durability
The assessment costs little, but it changes the budget more than any other decision. In FinishGrid's worked example, the same 150 m² of interior wall comes to about KSh 38,000 as a sound repaint and about KSh 82,000 as new rough plaster that needs full skimming. Getting the condition right also protects durability: a coating system that does not suit the surface, or skipped preparation, is a common reason a finish fails early.
What to check
- Every area you want painted is on a written list.
- You know which areas are new plaster and which are already painted.
- Damp, leaks and cracks are noted so they can be dealt with before decorating.
- Areas that must wait (damp, a crack being assessed, plaster still drying) are marked as on hold.
Mistakes to avoid
- Describing the job by bedroom count alone: wall area and condition decide the work.
- Treating the whole house as one condition when rooms differ.
- Asking for quotes before the scope is written down.
Helpful next: Check My Wall for one area at a time, and the Full House Painting Budget for a first budget by number of bedrooms.
Stage 2 of 8
Surface readiness and preparation
Paint sticks to what it is put on. If that surface is damp, dusty, loose or powdery, the paint fails with it, however good the paint is. This stage deals with causes first (leaks, rising damp, cracks whose cause is unknown), then gets each surface dry, sound and clean, with any shine dulled so new paint can grip.
When it's needed
- Always: cleaning, and dulling glossy paint.
- If there is damp or a leak: the source is found and fixed, and the wall dries, before decorating.
- If paint is loose or flaking: it is removed back to a sound edge.
- If old paint is chalky or powdery: loose material is removed and the surface is bound with a penetrating primer (stage 4).
- If plaster is new: it must be dry first. There is no single safe waiting time.
What it involves
- Washing or brushing down, scraping and sanding.
- Opening, cleaning and filling cracks that have been judged cosmetic.
- Repairs by the right trade: a plumber for leaks, a waterproofing or damp-proofing specialist, or a building professional for possible structural cracks.
- Protecting floors, fittings and furniture.
Cost, quality and durability
Cleaning and light preparation are part of every painting budget. Repairs to plumbing, roofs, waterproofing or structure are separate jobs with their own price, and FinishGrid's estimates do not include them. Skipping this stage is the most expensive saving in painting: paint over damp or loose material tends to peel or blister, and the wall then has to be stripped and prepared again.
What to check
- The cause of any damp has been fixed, not just painted over.
- No loose, flaking or powdery material is left on the surface.
- Glossy areas have been dulled and dust has been removed.
- Cracks were assessed before being filled.
Mistakes to avoid
- Using an anti-damp paint as a substitute for fixing the source of the moisture.
- Painting new plaster before it has dried out.
- Filling and painting over a crack whose cause nobody has looked at.
Helpful next: Wall Preparation Before Painting in Kenya, Damp Walls Before Painting: What to Do First and Painting Over Old Paint: How to Prepare the Surface.
Stage 3 of 8
Skimming and levelling
Skimming covers a wall with a thin layer of filler and sands it smooth, so the paint finish is flat and even. It is two different jobs: spot filling of local holes and cracks, which many walls need, and full skimming of a whole wall, which is mainly for new rough (wood-float) plaster when you want a smooth finish.
When it's needed
- Spot filling: when a sound wall has local defects.
- Full skimming: a choice, not a rule. Rough plaster can be painted directly if its texture is acceptable; it simply uses more paint.
- Not needed: on sound, smooth painted walls, or new plaster that is already smooth.
What it involves
- Wall filler suited to the surface (cement-based and gypsum fillers behave differently, so follow the product's guidance).
- One or more passes, then sanding and dust removal.
- FinishGrid plans full skimming of rough plaster at about 9–11 m² per 25 kg bag (a planning allowance, not a manufacturer rate).
Cost, quality and durability
Full skimming is one of the biggest single costs on a new house: both the filler and the slow labour. For 150 m² of rough plaster, FinishGrid plans roughly 14–17 × 25 kg bags of filler, a filler cost of about KSh 9,800 – 25,500, plus the skimming and sanding time. A well-skimmed wall gives a flatter finish and shows fewer flaws, especially in Vinyl Silk.
What to check
- Look along the wall with light coming from the side: ridges, hollows and trowel marks show up clearly.
- Run a hand over it: it should feel even, with no loose dust.
- Corners and edges are straight and the filler is not cracking.
- The quote says whether skimming is spot filling or full skimming, and for which walls.
Mistakes to avoid
- Assuming every new wall must be fully skimmed.
- Painting over sanding dust.
- A quote that says only "preparation" without saying whether full skimming is included.
Helpful next: Wall Skimming Cost in Kenya for filler quantities and costs, and Painting New Plaster in Kenya.
Stage 4 of 8
Undercoating and priming
The first coat on a new or prepared surface gives the finish coats an even base to sit on. Three words are used, and they are not interchangeable:
- Undercoat (or preparation coat): a first coat that evens out how much the surface absorbs and gives the finish coats a uniform base. In FinishGrid's interior systems it can be an undercoat or a thinned first coat of emulsion, as the product's guidance allows.
- Primer: a product made to help coating grip or to bind a surface, such as a penetrating primer on chalky walls, or a primer on bare wood or metal.
- Sealer: a product that seals a surface. FinishGrid does not add a separate sealer to its standard wall systems.
Which one a surface needs is set by the product's technical data sheet, not by habit.
When it's needed
- New smooth plaster, a skimmed wall or a prepared repaint: one preparation coat before the finish coats.
- Sound repaint in a similar colour: no undercoat in FinishGrid's systems: two finish coats.
- Changing to a very different colour: an undercoat may be needed for even coverage.
- Chalky or powdery surfaces: a penetrating primer to bind the surface.
- Bare wood or metal: a primer; rusted metal needs treatment first.
- New exterior plaster: one coat of undercoat. On exterior repaints an undercoat is never assumed.
What it involves
- One coat, applied after preparation and before the finish coats.
- Paint quantities worked out from the area and coverage, like any other coat.
- Drying before the next coat, for as long as the product's guidance says.
Cost, quality and durability
An extra coat means extra material and labour. For FinishGrid's 3-bedroom planning profile, a sound repaint of the interior walls and ceilings comes to about KSh 51,800 – 73,300; changing to a very different colour, which adds an undercoat, takes it to about KSh 62,900 – 92,000. Leaving out a coat a surface needs saves little and risks patchy colour or poor adhesion.
What to check
- The quote names the first coat (undercoat, thinned emulsion or primer) and which surfaces get it.
- Chalky walls are getting a primer, not just emulsion.
- The first coat has dried as the product requires before finish coats start.
Mistakes to avoid
- Adding an undercoat to every repaint by default, or leaving it out of every new wall.
- Using emulsion straight onto a chalky or powdery wall.
- Thinning more than the product's label allows.
Helpful next: How Much Paint Do I Need? A Practical Guide for Kenyan Homes explains how each coat changes the litres you buy.
Stage 5 of 8
Selecting paints and finishes
The right paint is the one that suits where it goes. Interior walls are usually Vinyl Matt or Vinyl Silk; ceilings are normally Vinyl Matt; outside walls take an exterior paint (standard acrylic or a premium or silicone exterior paint) or a textured finish; doors and window frames are usually gloss enamel. Choose by location, surface, exposure to sun and rain, how often the surface will be cleaned, and budget, rather than by brand.
When it's needed
Always, before quantities and quotes are fixed: the product decides coverage, packs and price.
What it involves
- Interior sheen: Vinyl Matt (flat, hides small flaws) or Vinyl Silk (soft sheen, easier to wipe).
- Exterior system: paint, or a textured finish. They are alternatives for the same wall, not additions.
- Gloss enamel for sound painted wood and metal, two coats.
- Colours: each extra colour adds cutting-in and changeovers.
Cost, quality and durability
Finish choice moves the budget less than preparation does, but it still matters. For the 3-bedroom planning profile, new interior walls and ceilings in Vinyl Silk come to about KSh 120,800 – 200,600 against KSh 119,700 – 200,600 in Vinyl Matt. Outside, the gap is wider: about KSh 31,900 – 40,500 for silicone paint on new plaster against KSh 83,000 – 104,400 for a textured finish with a painted colour coat (120.5 m²). Durability depends on the product suiting the surface and exposure, and on the preparation under it.
What to check
- Each area has a named product type and finish, not just "paint".
- Exterior walls get a product made for exterior use.
- The product's technical data sheet suits the surface it is going on.
Mistakes to avoid
- Choosing a sheen without thinking about wall flaws and light: sheen shows unevenness more.
- Using interior paint outside.
- Comparing quotes that price different products as if they were the same.
Helpful next: Silk vs Matt Paint: Which Interior Finish Should You Choose? and Exterior House Painting Cost in Kenya: What Affects the Budget?.
Stage 6 of 8
Paint and finish application
This is the stage most people picture: cutting in edges, rolling or brushing walls and ceilings, and building up the coats. In FinishGrid's systems, interior and exterior walls receive two finish coats after any preparation coat. Each coat has to dry for as long as the product's technical data sheet says before the next one goes on, and that time depends on the product, temperature and humidity, so there is no single figure to rely on.
When it's needed
Always, once the surface is ready and any first coat has dried.
What it involves
- Protecting floors, fittings and furniture.
- Cutting in edges, then rolling or brushing the open areas.
- Two finish coats (and the preparation coat where needed), with drying in between.
- Outside: dry weather, and no painting onto damp walls or just before rain.
Cost, quality and durability
Every coat adds paint and working time, so the number of coats is one of the first things to compare in a quote. In FinishGrid's 150 m² sound-repaint example (two finish coats), materials come to about KSh 25,000 – 30,000 and labour to about KSh 7,500 – 13,400, a total of KSh 32,500 – 43,400. Rushed coats, over-thinned paint and painting in poor conditions are common reasons for patchy colour and short-lived finishes.
What to check
- Agreed number of coats on every area, including behind doors and above cupboards.
- Even colour and sheen, with no thin or patchy areas.
- Clean, straight lines where colours and surfaces meet.
- Paint packs used are roughly what the quantity plan needed.
Mistakes to avoid
- Applying the next coat before the previous one has dried.
- Thinning paint more than the label allows.
- Painting outside walls that are wet or before rain.
Helpful next: How Much Paint Do I Need? A Practical Guide for Kenyan Homes and the Paint Calculator.
Stage 7 of 8
Inspection and project handover
Before you approve the work and make the final payment, check it against the scope you agreed: every area, every coat, the right products and colours, and a clean site. Then keep a simple record of the job. That record makes touch-ups, future repaints and any discussion about a defect much easier.
When it's needed
At the end of the job, and at agreed stages on larger jobs (for example after preparation, before the finish coats).
What it involves
- A walk-round in daylight, looking at walls from an angle as well as straight on.
- A written list of anything to put right, agreed with the painter.
- A record of products, colour names or codes, areas and dates, and any leftover paint labelled by room.
- Any guarantee terms in writing.
Cost, quality and durability
Inspection itself costs nothing extra, but it is your best protection for the money already spent: snags are far easier to fix while the painter is still on site. Be clear about what each promise covers. A paint manufacturer's product warranty concerns the paint; a workmanship guarantee is the contractor's promise about their work. They are different, and either may have conditions.
What to check
- Even colour and sheen, with no patches, runs, brush marks or missed areas.
- Clean edges at ceilings, skirtings, switches and frames; no paint on floors, glass or fittings.
- All agreed areas are finished, including doors and frames if they were in scope.
- Leftover paint is labelled and the colour names or codes are written down.
Mistakes to avoid
- Paying in full before the list of fixes has been completed.
- Inspecting only in artificial light or only straight on.
- Relying on a verbal promise for a guarantee.
Helpful next: How to Read and Compare a Painting Quotation in Kenya explains how to agree scope, coats and responsibilities at the start.
Stage 8 of 8
Maintenance and long-term care
A finish lasts longest when small problems are dealt with early. Clean painted surfaces gently in the way the product allows, touch up chips with the labelled leftover paint, and treat new peeling, bubbling or staining as a sign that something has changed, often moisture, rather than just a cosmetic mark.
When it's needed
From the day the job is handed over, and especially after heavy rain or any plumbing or roof problem.
What it involves
- Gentle cleaning: Vinyl Silk is easier to wipe; matt finishes vary by product, so check what the label allows.
- Touching up small chips with the same product and colour.
- Watching for damp stains, peeling or bubbling, especially near bathrooms, kitchens, roofs and the base of walls.
- Outside: keeping gutters and downpipes working and plants off the walls.
Cost, quality and durability
A wall that stays sound can usually be repainted later as a sound repaint, which is the least expensive system: in FinishGrid's 150 m² example about KSh 38,000. Walls that are allowed to peel need loose paint removed and preparation before they can be repainted, and a moisture problem left alone can damage the plaster underneath.
What to check
- Leftover paint is stored sealed and labelled by room.
- New stains or peeling are investigated for a cause before repainting.
- Outside walls are checked after the rains.
Mistakes to avoid
- Scrubbing a finish harder than its label allows.
- Painting over a new damp patch without finding the source.
- Touching up with a different product or sheen, which can show.
Helpful next: Why Is My Paint Peeling or Bubbling? and Damp Walls Before Painting: What to Do First.
Turning the stages into a budget
Once you know which stages each area needs, the budget follows: preparation, materials for each coat, labour for each stage, and project-specific items such as access, repairs and transport. The Full House Painting Budget shows this stage by stage for your house, and Cost of Painting a House in Kenya explains what drives each part.
Plan your own project
Get a stage-by-stage budget for your house, with every material, labour line and exclusion listed.