Can I repoint brickwork myself?

The physical process of raking out and repointing is within the capability of a competent DIYer — lime mortar is available pre-bagged from Lime Green, Tarmac, and Hanson. However: avoid using an angle grinder on Victorian brick without experience — brick face damage is permanent and expensive to remedy. The mortar mix specification (NHL grade, sand type, proportion) is critical for Victorian brickwork. For listed buildings or conservation area properties, repointing by a competent specialist is strongly recommended.

How long does repointing last?

Properly specified and applied lime mortar repointing on Victorian brickwork lasts 40–60 years before the next intervention is required. The factors most affecting longevity are: correct mortar specification (NHL grade and sand type); depth of joint (25mm minimum); quality of preparation (thoroughly raked, dust-free, pre-wetted). Cement repointing lasts 10–20 years but causes progressive brick damage — it is false economy.

Do I need planning permission to repoint brickwork in a conservation area?

Repointing (using matching lime mortar to the same profile as the original joint) is generally exempt from planning permission as it is repair and maintenance. However, if the repointing changes the appearance of the wall (different mortar colour, different joint profile), planning permission may be required in a conservation area. Listed buildings: repointing requires LBC if the mortar specification or joint profile is being changed — inform the conservation officer before commencing.

What colour mortar should I use for a Victorian London terrace?

Victorian London stock brick mortar was typically a pale buff or grey-buff colour — a mix of lime putty or NHL lime with coarse Thames Valley sharp sand. The colour matches the pale yellow-buff of the London stock brick and produces a barely-visible joint from a distance. Avoid using white (too contrasting) or grey cement mortar (wrong texture and porosity). For listed buildings, a mortar analysis (laboratory examination of the original mortar) is usually required to specify an exact match — Lime Green and the Building Limes Forum can provide matching services.

Brick Repointing Cost London 2025 | Builderr

How Much Does Brick Repointing Cost in London?

Brick repointing in London costs £25–£50 per m² for a standard two-storey Victorian terrace. A full front elevation (approximately 35m²) costs £875–£1,750. Lime mortar is essential for Victorian yellow stock brick and listed buildings — cement mortar traps moisture and causes brick spalling. Access scaffold adds £600–£1,500 for a standard two-storey elevation.

Brick repointing cost by area and access requirements

Brick repointing cost in London (rake out and repoint, lime mortar, per m², excluding scaffold): Ground-floor brickwork (accessible from ground level): £20–£35/m². Upper-floor brickwork (scaffold or access tower required): £30–£50/m² plus scaffold cost. Chimney stack repointing (accessed by scaffold or rope access): £600–£2,000 per chimney stack depending on height and condition. Parapet and copings repointing: £40–£60/m². Typical elevation areas and costs: Victorian terrace front elevation (two-storey, 5m wide × 7m tall, ~25m² of brick area): £625–£1,250 for repointing only; £1,400–£2,500 all-in with scaffold. Semi-detached house all elevations (100m² of brick): £3,000–£5,500 all-in. Full house repointing often done alongside other external works (window replacement, decoration) to share scaffold costs.

Lime mortar vs cement mortar for Victorian brickwork

Victorian stock bricks (yellow London stock, soft red brick) were laid in lime mortar — a mix of hydrated lime and sharp sand with no Portland cement. Lime mortar properties: breathable (vapour-open — allows moisture to pass through the joint and evaporate); flexible (accommodates the natural thermal and moisture movement of old brickwork without cracking); sacrificial (the joint is intentionally softer than the brick — damage concentrates in the replaceable mortar joint rather than the irreplaceable brick). Cement mortar: inflexible; harder than Victorian stock brick; traps moisture; causes brick spalling (the soft face of the brick blows off when moisture trapped by cement mortar freezes). Repointing Victorian brickwork with cement mortar is the most common cause of brick face loss in London Victorian terraces — avoid it entirely on pre-1920 stock. Correct lime mortar specification for London Victorian stock brick: NHL 2 or NHL 3.5 (Natural Hydraulic Lime) mixed 2.5:1 with coarse sharp sand. Listed buildings: lime mortar is mandatory — a conservation officer will specify mortar composition and colour to match the historic joint.

How to identify brickwork that needs repointing

Signs that brickwork repointing is overdue: Eroded joints (the mortar joint is recessed more than 10mm below the brick face — rainwater collects in the joint and saturates the wall); Hollow or powdery mortar (tap the joint with a key — a hollow sound indicates failed mortar no longer bonded to the brick face); Cracks in mortar joints (horizontal cracks at bed joints indicate differential settlement; vertical cracks at perpend joints may indicate structural movement — investigate before repointing); Damp patches on interior walls (eroded mortar joints allow rainwater penetration); Vegetation growth in joints (moss and lichens accelerate mortar erosion). Recommended inspection interval: Victorian and Edwardian brickwork every 15–20 years; modern brick buildings every 25–30 years.

Repointing process and quality standards

A professional repointing job follows a specific process. Raking out: existing mortar is raked out to a minimum depth of 25mm. Raking is done with an angle grinder fitted with a mortar raking disc, or by hand with a plugging chisel — for Victorian brick, hand raking is preferred for the final 5mm to avoid damaging the soft brick face. Dust blowing: the raked joint is brushed and blown out to remove dust and loose material. Pre-wetting: the brick and joint are pre-wetted before mortar application to prevent suction curing failure. Mortar application: lime mortar is applied in two or three passes (scratch coat followed by finish coat). Finishing: the mortar is finished flush or with a slight bucket-handle (concave) profile — a flush joint is correct for Victorian London stock. Curing: lime mortar cures slowly — protect from direct sun, frost, and driving rain for 7–14 days.