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U

Undercoat

Layer or layers of paint used to cover previous paint colours or wallpaper patterns or to cover the initial colour of a surface.

Undercutting

Cutting away material from the edges of a recess to provide a key for new material.

Underpinning

A method of strengthening weak foundations by supporting the walls, digging underneath and inserting a new foundation

Unique Property Reference Number

See UPRN

Unplasticised Poly Vinyl Chloride

See UPVC

UPRN (Unique Property Reference Number)

Each building in the UK is given a UPRN by the Government which is unique to that property

UPVC (Unplasticised Poly Vinyl Chloride)

Durable and versatile plastic commonly used in windows, doors, guttering and fascias