Practical rendering advice
Changing render colour on a mixed-use building
A building with a shop below and flats or offices above often has rendered upper floors, a separate shopfront and stone dressings. Changing its colour means coating the render in a product that suits it, keeping the stone and shopfront out of it, and working round the people using every floor.
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Changing the colour is different from replacing the render
A colour change keeps the existing render and puts a new coating on it. It suits render that proves sound when tapped; hollow, cracked or bulging render is repaired or replaced first, because a coating will not hold it on. A coating also cannot change the texture of the render underneath.
Weber's decorative-finish guidance separates the preparation of existing render from the choice of the new appearance. For a render respray, the product, background and application method need to belong in the same proposal. Spraying describes how material is applied; it does not identify the material or establish that the existing surface can support it.
On a mixed-use building the coating has to work for a commercial frontage at street level and the homes above it. The render can be one colour across the upper floors while the shop sign, fascia and frames keep their own colours, so decide which elements are in the coating job before work starts.
One building, several surfaces
A mixed-use building often has several surfaces that look alike from the street but are not. The upper floors may be lime render, the side return a later cement render, the shop surround painted timber or tiles, and the window heads and sills sandstone. Each takes a different coating, and the stone takes none: Bradford Council’s stone guide says do not paint stonework, because paint can trap water and damage it.
Colour choices also need thinking through. A shade that looks neutral on its own may clash with a dark shop sign, and the council’s render guide notes that white limewashed upper storeys are a key feature of Arts and Crafts and other early 20th-century buildings. Use a marked-up photo to show which rendered surfaces get the coating, which stay as they are, and which belong to the shopfront.
| Decision | Who or what to identify |
|---|---|
| Authority to proceed | Responsible owner or authorised representative. |
| Appearance approval | Accepted sample and required consultations. |
| Treatment boundary | Included render and retained surfaces. |
| Preparation | Condition assessment and repair dependencies. |
| Occupation | Access and communication during application. |
Permission and listed status
The rules for a colour change depend on the building and the area. The government’s householder permitted development guidance is written for houses, so for a building with shops and flats, ask the council whether a new colour or a new finish needs permission. In one of the district’s 60 conservation areas, or on a listed building, expect a closer look.
In the city centre, the council’s Little Germany assessment records that 55 of its 85 buildings are listed, most of them sandstone, so recolouring render there is rarely a simple decorating job.
The owner of the building normally decides the colour of the render, while tenants often control their own shopfronts, so settle both before samples go up.
Identify the render on each floor
Before choosing a coating, find out what each area is. Lime render is usually softer and may have been limewashed; cement render is harder and greyer; a through-coloured render has colour right through; previous masonry paint shows as a film that can peel. If records exist, use them; if not, a small test on each area helps.
The coating then follows the render. The council’s render guide recommends limewash or oil paint on historic lime render and warns against modern impermeable or long-life paints, which can damage the render and the wall behind. It also says to use the same coating when repainting, because not all coatings are compatible. On modern render, a breathable masonry coating is used, and coatings exist specifically for refreshing existing scraped render.
One mistake to avoid is a modern masonry paint over limewashed lime render on the upper floors. The council’s render guide warns that impermeable or long-life paints damage the render, and potentially the wall behind it, by stopping it breathing. Removing such paint later is slow work, so the coating needs to be right the first time.
Separate repairs from decoration in the quote. Hollow render, cracks and recurring stains are repaired first, and the colour goes on afterwards.
Signs, windows and the shop below
Signs and lights fixed through the render usually come off for the coating and go back on sealed fixings. If a sign is being replaced, its fixing points are best decided before the coating so new holes are not drilled through a fresh finish.
Upper-floor windows are masked during spraying and cannot be opened while the masking is up, which affects flats and offices. Spraying is done when the shop entrance below can be protected, and overspray on the shopfront glass is cleaned off the same day.
If a sign or fascia is still to be installed, fit it before the final coat or protect the coating while it goes up.
Plan the shop surround and fascia as a separate item. They are often timber, tiles or metal rather than render, take different paints, and may belong to the tenant rather than the building owner.
Preparing and applying the coating
The sequence is the same as any respray, with more masking. Tap-test and repair the render and let the patches cure. Mask glazing, signs, shop surrounds, stone dressings and the pavement. Wash the render and treat algae with a biocide, then rinse and let it dry. Prime patched or powdery areas so the colour takes evenly. Spray in even passes, usually two coats, and cut in edges by brush.
Spraying stops in wind that would carry drift onto shopfronts, cars or passers-by, and the work area below is kept clear. Once a sample has been approved, treat any request from an occupier for an extra panel or a different colour as a change to the agreed work, approved by whoever is authorised for the building.
Choosing and recording the colour
Judge the sample on the building itself, beside the stone sills, the shop sign and the neighbouring buildings, and from across the street, where most people will see it. A colour reads lighter across a whole upper floor than on a sample.
Each spring, look at the upper floors from the street for flaking, green streaks below sills and cracks around sign fixings, which are the places where water gets behind a coating.
Record the coating product and colour so the next recoat matches. The Bradford rendering homepage links to the respray and commercial pages for buildings that need repairs as well as colour.
See housing and planning information for Bradford and nearby places, including the source and geography behind each figure.
