Getting Your House Rendered for the First Time: What to Expect

Before you pick up the phone

You don't need to know anything specific before you call. We don't expect customers to have researched render systems or worked out what prep their walls need — that's our job. But it helps to have a rough idea of what's on the wall currently (bare blockwork, old pebbledash, existing sand-and-cement render), whether there are any obvious damp issues internally, and roughly what you're hoping the end result will look like.

If there's a planning constraint — a listed building, a Conservation Area, an Article 4 direction — it's worth knowing that before we discuss systems, because some render finishes require permitted development rights that may have been withdrawn in your area. For most properties in Cornwall this isn't an issue, but it's worth checking on older or more prominent properties. We've written a separate piece on planning permission and rendering if you want the full detail on that.

The quote visit

We come to the property in person — We don't price render jobs off photographs or descriptions alone. When we're there we'll walk every elevation, tap the walls to check for hollow spots where render has delaminated, look at the condition of any existing render, check around window and door reveals for cracked or open joints, and look for any signs of damp tracking through the wall. We'll also take rough measurements so the quote is based on actual area, not guesswork.

We'll ask about your plans for the property — whether you want a clean modern look or something more in keeping with an older building, whether colour matters to you, and whether there are any constraints like scaffolding access difficulties, neighbouring properties close by, or protected structures nearby. All of this affects what system we'd recommend and how the job needs to be planned.

The quote itself covers all labour and materials. We don't add hidden extras after the job. If something unexpected turns up during prep — a section of wall that's significantly worse than it appeared from outside, or a structural issue we couldn't see at quote stage — We'll come to you before doing anything about it, not bill you after.

Choosing the right system

For most Cornish properties we'd lean towards silicone render for external work — the coastal climate, the rain volume, and the amount of north-facing wall on many properties makes a hydrophobic, self-cleaning system a sensible investment. On inland new-builds with solid modern blockwork, monocouche is a perfectly good choice and often slightly cheaper. For older solid-wall properties, lime-based systems are sometimes the right answer to protect the building's ability to breathe.

We'll also discuss colour at this stage. Both silicone and monocouche systems come in through-colour formulations — the pigment runs all the way through the material, so the surface never needs repainting. Our preferred suppliers carry around 200 standard colours plus colour-matching. If you're unsure, we can order a sample panel applied to a board so you can see the colour in natural light before committing.

Prep work — the bulk of the job

This is the part that surprises most first-timers: the preparation stage takes longer than the application. It's also where the quality of a render job is really determined. A render system applied over a poorly prepared substrate will fail in a few years regardless of how good the material is.

Prep typically involves: cutting out any hollow or delaminated sections of existing render; hacking back to a clean, sound substrate where needed; filling cracks in the substrate with the correct material (not just filler); treating any biological growth — algae, lichen, mould — with a biocidal wash; checking and repointing any failed mortar joints; and applying a primer or bonding agent to improve adhesion, particularly on smooth surfaces like dense blockwork where the render would otherwise have nothing to key into.

On a full house, scaffolding goes up first. This is usually arranged by me and factored into the quote. The scaffold means every elevation can be worked properly from a safe working platform — not from a ladder, which limits how well the work can be done. We'd rather take the extra day for scaffold than rush the job from a ladder.

Application

Once the substrate is properly prepped, the render goes on faster than most people expect. On a full house we'd apply the basecoat (which can be done by machine on large flat areas), allow it to firm up, then apply the topcoat and finish it to the specified texture. The whole application stage on a four-bedroom detached property typically takes two to three days of active work, assuming the prep is done and the weather is cooperating.

The finish texture is determined by the system and by what you've chosen. Scraped finish (the most common) gives a slightly rough, uniform texture. Smooth or fine textured finishes are available on some silicone systems. Rough-cast and pebble-dash effects are possible if that's what the property suits. We'll show you examples at quote stage so you know what you're getting.

Drying and curing times

This is important to understand before the job starts. “Drying” and “curing” are different things. The render will be dry enough to be rain-safe within 24–48 hours of application in normal conditions — meaning a passing shower won't wash it off. But full chemical cure, where the render has reached its final strength and performance characteristics, takes around 4–6 weeks.

During that curing period the render is still hardening and shouldn't be subjected to heavy pressure washing or any physical impact. It also shouldn't be painted over (if you're using a painted system rather than through-colour) until it's fully cured — painting too early traps moisture in the surface and causes blistering. We'll tell you specifically what the waiting period is for your system and product.

After the job

Once the render is on and the scaffold is down, we'll do a final walk-round with you. If there are any areas you want to look at more closely or any questions about what you're seeing, that's the time to ask. If anything comes back that's related to the way the job was done, we'll return and sort it.

After that, the maintenance requirements on a through-coloured silicone or monocouche render are very low. An occasional clean every few years to remove surface dust and biological growth is all most properties need. We've written more detail on how to clean render properly without damaging the surface.

How long does the whole process take?

From first contact to a finished house: you should expect a few weeks between the initial quote and the work starting — We book jobs in sequence and don't rush from one to the next without proper preparation. Once on site, a typical full house render on a four-bedroom detached property takes around five to eight working days in total, including prep, application, and finishing. Smaller jobs and single elevations are faster.

In Cornwall the best time to book is spring — March to May — or autumn, September to October. These are the windows where the weather is consistently above 5°C and stable enough for render to cure properly. The summer holiday period (July–August) is also fine weather-wise but tends to book up fast. January and February are difficult months in North Cornwall — cold snaps and heavy rain mean application windows are unreliable and we wouldn't take on a large external render job in those months without being able to guarantee adequate curing conditions.

What does it cost?

We've written a full breakdown on rendering costs in Cornwall, so we won't repeat all of it here. The short version: there's no fixed price — every job is quoted individually because the cost depends on condition, access, and the system chosen. Single elevations and smaller jobs scale down from a full-house render.

The biggest variables are the amount of prep required — a wall in good condition takes far less prep time than one with extensive delamination — and whether scaffolding is straightforward or complex (sloped ground, tight site, unusual access all add to scaffold cost). We price every job individually on-site for this reason. A price based on a description or a postcode is just a guess.

What a good job looks like

A good render job looks even, flat and clean. There are no visible lines between bays, no patchy colour variation, edges at reveals and sills are clean and straight, and the finish texture is consistent across the whole elevation. When you run your hand across it there are no high spots or dips. It should look like it was always there.

It should also look right in a year's time. A few months after a render is applied you'll sometimes see efflorescence — a white salt bloom on the surface as the material cures and moisture works out. This is completely normal and will weather away. If staining or algae growth appears in localised patches within the first year, it usually means there's a water ingress point that wasn't addressed in prep. That's something we'd come back and investigate.