Rendering for New Builds and Extensions

Both silicone and monocouche render can be suitable for extensions.

Silicone is often selected where the customer wants a modern, fine-textured finish or plans to render the original property at the same time.

Monocouche is popular on newly constructed blockwork where a traditional scraped finish is preferred.

Render can be applied to certain blockwork backgrounds once the masonry is correctly constructed, stable and ready to receive the selected system.

The background may require primer, basecoat, reinforcement mesh or another preparation system.

We inspect the blockwork and confirm the required build-up before application.

New masonry and mortar must be sufficiently cured and dry before rendering begins.

The correct waiting period depends on the block type, mortar, weather conditions, wall construction and render manufacturer’s requirements.

We assess the background rather than relying on one fixed timescale for every project.

Windows and external doors are normally installed before the final rendering begins.

This allows the render to be accurately finished around the frames, reveals and sills.

The surrounding frames are carefully protected before application.

The building should generally be weather-tight before the final render system is installed.

Incomplete roof coverings, gutters or flashing can allow water to run down or enter the new walls.

We coordinate with the builder to make sure the property is ready before rendering begins.

We can match the colour and texture as closely as reasonably possible, but an exact match cannot always be guaranteed.

Existing render may have faded, weathered or become stained over time. Differences in product, colour batch and texture can also remain visible.

Rendering the complete elevation or property may produce a more consistent appearance.

Yes. Many homeowners choose to render the complete property once the extension has been built.

The existing walls must first be inspected and repaired. Different backgrounds may require separate preparation before a consistent basecoat and finish can be applied across the property.

New extensions and original buildings can move differently, particularly while the new construction settles and dries.

Correct detailing, reinforcement mesh and movement joints can help manage this movement, but no render system can guarantee that structural movement will never cause cracking.

The junction should be assessed as part of the proposed system.

Reinforcement mesh is a fibreglass fabric embedded within the render basecoat.

It helps distribute minor stresses across the surface and provides additional reinforcement around openings, material changes and vulnerable sections of the wall.

It is commonly used as part of silicone render systems.

Yes. Silicone render is suitable for many new-build properties when applied as part of a correctly specified system.

It normally consists of a compatible substrate preparation, mesh-reinforced basecoat, primer and coloured silicone topcoat.

It creates a breathable, flexible and water-repellent finish.

Yes. Monocouche is commonly used for new builds and extensions constructed from suitable blockwork or masonry.

It provides a through-coloured, scraped finish with no immediate need for painting.

The background must still be correctly prepared and reinforced where required.

Timber-frame and framed extensions may be rendered using an approved carrier-board and render system designed for that construction.

The board, fixings, joints, movement details and selected render must all form part of a compatible system.

We would need to review the proposed construction before quoting.

Rendering is weather dependent.

Low temperatures, rain, frost, strong wind and excessive moisture can affect curing and the finished appearance. Temporary protection may sometimes help, but work may still need to be delayed when conditions fall outside the product requirements.

The programme should allow some flexibility for unsuitable weather.

Silicone and monocouche render are both available as coloured finishes and do not require immediate painting.

Cork render is also supplied in a range of finished colours.

The selected colour forms part of the render or topcoat system.

Scaffolding is normally required for upper-storey elevations and larger extensions.

We can coordinate the scaffolding as part of the project or work from scaffolding supplied by your builder, provided it is safe and suitable for rendering.

The quotation will make clear who is responsible for access.

The timescale depends on the size of the extension, number of elevations, chosen system, background preparation and weather.

A small single-storey extension may take several working days, while larger or full-property projects will take longer.

An estimated programme will be provided once the project has been surveyed.

The price depends on:

• Total wall area
• Height and number of elevations
• Type and condition of the background
• Selected render system
• Number of windows, doors and architectural details
• Amount of beading and reinforcement required
• Scaffolding and access
• Colour and finish selected

We can often provide an initial estimate from plans, measurements and photographs before confirming the final quotation on site.