Fit understairs cupboard shelves to a metal stud wall — HomeGraft

Fit sturdy shelves inside your understairs cupboard, working out your wall type first so every bracket is fixed safely.

AB-01Clear the cupboard and check the spaceEmpty the cupboard completely and vacuum out dust and cobwebs. Understairs cupboards often mix wall types, so shine a torch over the sloping wall under the stairs and the back wall. Note any sockets, pipes or the electric meter that might be hidden inside. Wear a dust mask, this job gets dusty.

1 each · Dust mask

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1 each · Torch

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AB-02Decide shelf heights and gather materialsDecide how many shelves you want and mark rough heights in pencil, leaving room for what you'll store. A typical understairs shelf is 300-400mm deep, with at least 250mm gap between shelves for boxes. Buy your shelf boards now, but hold off buying fixings until you've checked your wall type in the next step.

2 each · Shelf board, 18mm MFC, 300mm x 900mm

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1 each · Tape measure

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1 each · Pencil

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AB-03Work out what your wall is made ofUnderstairs cupboards often have one solid masonry wall (the wall under the stairs, sometimes an outer or party wall) and one stud partition wall facing the room. Run a magnet or stud detector across the wall - a line of screw heads roughly 400mm or 600mm apart means a stud wall. Drill a small 3mm pilot hole in an inconspicuous spot: timber dust means a timber stud, fine grey swarf means a metal stud, and solid resistance with brick-coloured dust means masonry. Tap the wall too - a dull, solid sound is masonry or dot-and-dab, a hollow sound between studs is a stud wall.

1 each · Stud detector

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1 each · Magnet

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1 each · Drill bit, 3mm

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AB-04Mark bracket positions and check they're levelHold a spirit level against the wall at your chosen shelf height and draw a level pencil line. Mark bracket positions along the line, usually every 400-500mm, and always within 50mm of each end of the shelf. Measure from a fixed point, like the floor or corner, on both walls to make sure the shelf will sit level all round.

1 each · Spirit level

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AB-05Check your stopcock and consumer unit before you drillCables and pipes can run almost anywhere in a wall. A detector helps but can miss cables that are deep, in metal conduit, behind metal-backed plasterboard, or outside the usual safe zones - and a metal stud frame confuses cheap detectors further. Before drilling, find your stopcock (usually under the kitchen sink) and check it turns freely, so you can shut off the water fast if you hit a pipe. If you have any doubt about what's behind the wall, isolate the relevant circuit at the consumer unit before drilling, and turn off the water at the stopcock before cutting into anything that could carry water.

AB-06Fix brackets into solid brick or blockOnly follow this step if your test showed masonry. Drill with a 6mm masonry bit to the depth of your plug, usually 40-50mm, insert a red wall plug, then drive a 40mm screw through the bracket into the plug. Check the bracket is tight and doesn't spin in the hole; if it does, use a bigger plug.

1 each · Masonry drill bit, 6mm

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1 pack (10) · Red wall plugs

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1 pack (10) · Screws, 40mm

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AB-07Fix brackets into plasterboard on timber studsOnly follow this step if your pilot hole brought out timber dust. Drill a 3mm pilot hole in the centre of the stud, then drive a 5x60mm wood screw through the bracket straight into the timber. If a bracket position falls between studs rather than on one, use a plasterboard toggle rated for the shelf's weight instead.

1 pack (10) · Wood screws, 5x60mm

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1 pack (4) · Plasterboard toggles

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AB-08Fix brackets into plasterboard on metal studsOnly follow this step if your pilot hole brought out fine steel swarf, common in flats and anything built or refitted since the 1990s. Use self-drilling metal stud fixings or a toggle-type hollow-wall anchor rated for the shelf's weight - never a plain plastic plug and never an ordinary wood screw, both strip straight through 0.5mm steel. A metal stud alone won't hold much weight or anything that pulls away from the wall as it's used, so fix into several studs, keep the load close to the wall, and consider screwing a timber batten across two or more studs first to spread it.

1 pack (10) · Self-drilling metal stud fixings

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1 each · Timber batten, 25x50mm x 900mm

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AB-09Fix brackets into dot-and-dab plasterboardOnly follow this step if the wall sounds solid but is actually plasterboard glued to masonry with adhesive dabs, common on the inner face of external or party walls. Use a long fixing, 60-75mm, that passes through the plasterboard and the dabs behind it to reach the solid masonry. Drill through with a masonry bit sized to your plug, fit the plug once it reaches brick, and screw the bracket on firmly.

1 pack (10) · Long masonry plugs, 60-75mm

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1 pack (10) · Screws, 75mm

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1 each · Masonry drill bit, 6mm

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AB-10Fix brackets into lath and plasterOnly follow this step in an older house where the wall is timber laths under lime plaster, common under the stairs in Victorian or Edwardian homes. Find the timber studs behind the laths with your detector or pilot hole test, and screw into solid timber wherever possible, since plasterboard-style toggles can pull straight through crumbling old plaster. If you can't hit timber, use a heavier long toggle fixing and spread the shelf load across several fixing points.

1 pack (4) · Long toggle fixings

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AB-11Cut the shelf boards to sizeMeasure the exact width and depth of the cupboard at each shelf height - the sloping ceiling often means the back is narrower than the front. Mark and cut the shelf board with a hand saw or jigsaw, then sand the cut edge smooth. Offer up each board before fitting to check it slides in without forcing.

1 each · Jigsaw

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1 each · Sandpaper

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AB-12Fit the shelves onto the bracketsLower each shelf board onto its brackets and check it sits flat and level with a spirit level. If your brackets have fixing holes, screw the board down from underneath using short screws that won't poke through the top. Check the shelf doesn't rock and sits square in the cupboard.

1 pack (10) · Short screws, 12mm

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AB-13Load test and tidy upAdd weight gradually and check the brackets and wall fixings hold without flexing or creaking. Vacuum up all dust and offcuts, and dispose of packaging responsibly. Wipe down the shelves before putting your items back.

1 each · Cleaning cloth

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