To ensure your trim fits into the wall opening we have to make allowances. Internal trim measurements (measured from the front of the trim) would be calculated by using the following formulas.

If you want an inside return and an outside return on your trim- adding an outside return will reduce how far the inside return goes into the wall cavity. As an example, if the outside return is 20mm and you want 50mm of the inside return to go into the wall cavity you will require an inside return of (50mm + 20mm) = 70mm.The minimum inside return size is 10mm Browse through our selection of fire trims to find the one that suits your fireside. We offer the finest quality of trims made of materials that are sturdy and long lasting. Delivery times are quoted in business days meaning weekends and local holidays including bank holidays, Christmas etc do not count as business days. DELIVERY TIMES - Custom Made Products

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When we refer to INTERNAL TRIM WIDTH and INTERNAL TRIM HEIGHT measurements - We are always referring to the internal measurements of the trim (measured from the front) When we refer to WALL OPENING WIDTH and WALL OPENING HEIGHT measurements- We are always referring to the size of the hole in your wall. When you provide us this measurement we will make the trim very slightly smaller (but a snug fit).