Renderers Harrogate

What Harrogate’s walls are made of

The 2010 Harrogate Conservation Area Character Appraisal describes the heart of the town as carboniferous sandstone, sometimes called gritstone, with Welsh slate roofs. A bare stone villa needs stone repair and pointing, not render. Render arrives with the Edwardian period, when the appraisal says brick and render begin to rival stone. The later houses of the Duchy Estate often have brick to the ground floor and render above, with half-timbering and occasional pebbledash, and in High Harrogate many older sandstone buildings have been rendered or painted.

So most rendering work in and around the town falls into three groups: renewing or repairing render on Edwardian, inter-war and later houses built to carry it; replacing render on older stone or brick walls, where a soft lime render usually suits; and rendering extensions and new blockwork, where modern systems such as silicone thin coats and monocouche are used.

Repair, recolour, re-render, remove or insulate

The condition of the existing render decides the job. Start by tapping it: render that has lost its bond sounds hollow. If the render is sound and the complaint is fading, staining or a colour you dislike, a respray or colour change over cleaned, repaired render is usually enough. If the damage is local, such as a hollow patch under a sill, cracks running from window corners or a strip blown by frost along the base, a repair cuts back to sound render and patches it to match.

When hollow areas join up across most of a wall, or a hard cement render on an older stone wall is cracking and holding water, the render is better replaced, either one wall or the whole house. Unwanted or failing pebbledash can be hacked off and the wall re-rendered, or overcoated if sound. If the walls are solid and the render is due for renewal anyway, external wall insulation can be considered at the same time, though it is rarely right for a stone villa in a conservation area.

What actually happens to the wall

Whatever the job, the sequence is much the same. The wall is inspected: tap-tested for hollow areas, cracks traced to their source, and the damp-proof course level, sills, copings and gutters checked, because water from failed drips and leaks is behind many render faults. Failed render is hacked off and the brick or stone behind it repaired. Hollows are dubbed out, dense surfaces primed, and lime backgrounds dampened. The new render goes on in coats, with mesh at window corners where the system calls for it. Beads give straight edges: a bell-cast bead just above the damp-proof course, angle beads on corners and stop beads where render meets stone. The work is then protected from rain, strong sun and frost while it cures.

Conservation areas, Article 4 and permission

North Yorkshire Council describes the Harrogate conservation area as covering the Victorian town centre, and the 2010 appraisal divides it into character areas including the Duchy Estate, High Harrogate and the Stray. In a conservation area, the government’s householder permitted development guidance says cladding any part of a house with render, or with pebble dash, is not permitted development, so it needs a planning application.

Harrogate's appraisal also describes an Article 4 direction covering painting previously unpainted external fabric and repainting in a different colour, with exceptions for joinery and metalwork. Check the direction and address before ordering a colour change. Listed-building consent concerns alterations that affect special architectural or historic interest. Building regulations deal separately with energy performance: substantial re-rendering can trigger an insulation assessment when renovation exceeds half of a thermal element or more than a quarter of the external building envelope. The amount of work, the wall construction and the feasible improvement all need to be settled before a contractor prices the final specification.