When adding to an existing building, perfectly matching the original brickwork usually is possible, but it's seldom easy and shouldn't be approached casually. Color is Key Color, more than texture or even size, is the key factor in getting a good match. But in masonry, color itself is complex. The color of a brick wall is perceived differently, depending on the distance it's viewed from. Assemble the Team The best thing an architect can do to assure a good match job is to work with the right brick salesperson, and to involve the sales rep early in the process. The original supplier will know the differences in clays, firing temperatures, and manufacturing techniques used to produce its brick. Analyze the Existing Masonry Determine the blend: As a first step, find out the percentages of each color in the existing blend. Match brick dry: Many bricks appear darker than their true color when they're wet or damp. And even when brick seem dry, they often contain enough moisture to affect the apparent color. Check for coatings: Determine whether the existing masonry or potentially matching brick have been treated with water-repellent coatings that will affect their wet appearance. Consider weathering: As brick age, their appearance changes. After years of exposure to weather, pollution, and dirt in the atmosphere, an existing building looks different than it did when it was first completed. Give Mortar its Due Mortar makes up 10% to 20% of a masonry surface and is an important factor in the appearance of the wall. Mortar color strongly affects a viewer's perception of brick color as well.