General

• Carry out regular inspections and maintenance.
• Seek advice from suitable qualified professionals.
• Quickly identify problems and arrange repairs.
• Repair rather than restore or replace.
• Respect the buildings character and history and ensure the new work is sympathetic and appropriate.
• Remedy previous bad repairs.
• Use a reputable workman. 

• Allow serious defects to remain.
• Repair using unsympathetic materials.
• Use unsuitable mass produced architectural elements
• Waste re-usable materials.
• Remove or demolish original elements.
• Carry out any work without the required consents.
• Lay a hard surface or tarmac close to your building as prevent rainwater from soaking away.

Walls

• Use lime mortar for all pointing and repair works.
• Use traditional lime render and washes on undressed stonework.
• Seek professional help to remove staining.

• Clad walls in stone or other artificial materials.
• Strip render from stonework or brickwork and leave it exposed to the elements.
• Use cement based mortars.
• Use aggressive cleaning materials.

Roofs and Rainwater Goods

• Check for defects.
• Re-use original slates.
• Match replacement slates.
• Use lime mortar.
• Use cast iron or cast aluminium for replacement rainwater goods.

• Use inappropriate slating methods, styles or materials.
• Use poor quality slates.
• Use bituminous treatments.
• Remove original features.
• Use cement mortar.

Windows and Doors

• Check for defects.
• Redecorate regularly.
• Replace missing putty and slips.
• Fill cracks and open joints.

• Replace windows or doors in non-original patterns or materials.
• Damage original glass or ironmongery.
• Build up paint layers.
• Use silicon sealants.
• Strip or sandblast doors.