Greater Glasgow's building stock is defined in many areas by its distinctive sandstone tenements — built in red or blonde Ayrshire and Dumfriesshire sandstone, typically four to six storeys, with solid stone walls between 380mm and 450mm deep. Alongside the tenement stock, Glasgow has extensive post-war council housing in concrete and brick, and modern commercial development in reinforced concrete across the city centre and Clydeside. Each material type requires a different core drilling approach.

Greater Glasgow Building Stock

Sandstone Tenements (Victorian and Edwardian)

Glasgow's tenement stock — Partick, Shawlands, Dennistoun, Pollokshields, and much of the West End — is built in local sandstone, either the warm red sandstone of Ayrshire or the blonder, harder sandstone from Dumfriesshire. Glasgow sandstone is moderately abrasive but softer than millstone grit. Key considerations for core drilling:

  • Wall thickness of 380–450mm is standard in tenement construction. Extension rods are required for through-wall penetrations, and the pilot drill must be long enough to guide the bit through the full depth.
  • The sandstone in Glasgow tenements varies in hardness between buildings. Blonder sandstone (Dumfriesshire origin) is harder and more abrasive than the warmer red Ayrshire stone. If progress is slower than expected, increase bit pressure slightly rather than increasing RPM.
  • Many tenement flats are in Category B Listed Buildings or conservation areas. Check with Glasgow City Council Building Standards before drilling any external wall penetrations on tenement stock.
  • Use a medium-bond dry bit or universal bit rated for stone — soft-bond bits designed for light masonry can glaze on the harder sandstone variants.

Inter-War Suburban Housing

Glasgow's inter-war suburban expansion — Knightswood, Mosspark, Riddrie, and Scotstoun — produced large areas of brick-cavity semi-detached housing, similar to the English inter-war pattern. Standard dry diamond bits cut this comfortably and extension rods are not required for standard flue or extractor penetrations.

Post-War Housing Estates

Drumchapel, Castlemilk, Easterhouse, and Pollok contain substantial post-war housing from multiple construction eras: traditional brick-cavity, Wimpey No-Fines concrete, and concrete panel tower blocks. Tower blocks and panel construction require wet rebar-rated bits and a dedicated machine. No-Fines concrete drills with a universal dry bit but generates high dust volumes — extraction is important.

Commercial and Modern Development

Glasgow city centre, Clydeside, and the Merchant City area contain commercial buildings from reinforced concrete frame construction spanning the 1960s to the present. All structural concrete penetrations require wet coring with a rebar-rated bit, rebar scanning before drilling, and a 1500W+ dedicated core drill machine.

Core Drill Bit Sizes for Glasgow Trade

  • 107mm — boiler flue penetration; standard in both tenement retrofits and new-build installations
  • 117mm — 110mm soil stack connections, particularly in tenement ground floor and basement conversions
  • 52mm — 40mm waste pipe runs for kitchen and bathroom additions
  • 38mm — cable entries for EV chargers, broadband, and security installations

For full bit selection, see the diamond core drill bits guide. For machine recommendations, see best diamond core drills UK. For boiler flue sizing, see the boiler flue core drill guide.