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Made to Measure Square Hole Grilles


STOP PRESS – Due to foundry closure these grilles have been discontinued. If the product is still advertised then that means we still have stock – kindly email to check if you require more than one of any size to check we have material.

Made to measure Square Hole Cast Iron Grilles available in 2-3 weeks

Why wait months for a foundry to cast a grille to your dimensions when we have the material to make your cast iron grille already on our shelves? No need to commission drawings, no waiting for wooden patterns to be made, no requirement for pattern boxes to be constructed and no need to wait for a foundry to melt and pour the iron.

We have done all the hard work for you. We have already commissioned square hole cast iron gratings in 36 inch (910mm lengths) in 7 different widths and stocked them up on our shelves ready to be cut to size. We’re the only company that makes cast iron gratings and cuts them to size, all you have to do is choose the size (4″, 5″ and 6″ grilles are no longer available)  and select the length and width from over 300 different sizes from the guide here  Size Guide – Cast Iron Made to Measure Square Hole Grilles

Get an instant quote or order the grille from the drop down boxes below (or email us sales@castironairbricks.co.uk )

The grilles are already semi primed black on our shelves to stop them rusting in our workshops so we are afraid they can’t be supplied bare metal. We are happy to supply them in the primed finish if prefered to the gloss black finish (please let us know when placing your order) but please note they will rust much more quickly than the fully painted versions and also they will have bare metal ground finish on the cut ends. There is no difference in price having them without the gloss finish but it will reduce the delivery time by a few days. Customers wanting to paint with their own colours with oil or epoxy paints should order this primed finish (the gloss black is almost impossible to paint over in any other colour than black).

For larger orders we can and have supplied made to measure grilles in all sorts of RAL colours, professionally primed with 3 part epoxy and a 2 part gloss or matt top coat but there is an additional cost of £200+vat extra for this and it cant be ordered via this website – please email item number, quantity and RAL number for a proforma cost for this.

Architects – For information of the free air supply area in mm2 and sizes available from these grilles download our guide…….

Size Guide – Cast Iron Made to Measure Square Hole Grilles

It is recommended to download and read our PDF for the grilles which contains further information regarding the manufacture and installation …

Specification PDF for Cast Iron Made to Measure Square Hole Grilles ciabMTM

Beautifully simple and elegant, the square hole design has been used for centuries from castles, keeps and manor houses to modern extensions and art galleries. Indeed many of the grilles we make are for a wonderful array of clients and their properties including the delightful Wiltons Music hall in London and shop fronts along the stunning period high street in Chester, England. We even ship these made to measure grilles, supplying the architectural practice, Tendenze design in New Jersey USA with a substantial order of bespoke grilles, a property owner in Florence, Italy with just one grille and even a pair of grates all the way to a house in Auckland, New Zealand! We have made these grilles for the stunning Portland stone, grade 2 listed property on Tabernacle Street in London known as Lowndes House. This building now houses offices and is a well known feature being especially recognised for it’s unusual wedge shape and its beautiful dome and pinnacle. We have also created grilles for “Woodstock House, Oxford” during its extensive 2019 restoration, reputed, according to The Telegraph, to have the finest view in England.

These grilles are available in a range of heights from 7″ to 15″ and can be cut to almost any length, priced according to three length variations:

Short: Up to 8″ (205mm)
Medium: 8″ to 18″ (205mm – 420mm)
Long: 18″ to 36″ (421mm – 915mm)

Please specify your desired length in the box below.

Drilling & mesh can be added for an additional cost, prices vary from £15 – £50 for mesh, and £10-25 for drilling depending on width of grille.

We can also make narrow square hole gratings of 2, 3 or 4 rows ( from 40mm high) in lengths from 125mm up to 300mm long. Please email sales@castironairbricks.co.uk

Please see product specification & sizes in the table below.


Desired length


Specification PDF for Cast Iron Made to Measure Square Hole Grilles ciabMTM



Item Grille height (Inch) Grille height (mm) Top / bottom border (mm) End border widths (mm) Row of holes Square hole size Plate thickness (mm)
MTM7 7 178 11 5 8 14 12
MTM8 8 200 16 6 8 15 12
MTM9 9 227 10 6 10 15 12
MTM10 10 253 21 6 10 15 13
MTM11 11 273 20 6 11 15 13
MTM12 12 300 15 7 13 14 12
MTM15 15 380 13 6 17 15 14


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