This paper will focus on the interior conservation work executed at First Parish Church, Brunswick, Maine. Designed by Richard Upjohn and built in 1845, the building has escaped aggressive restoration and had retained all of the decorative treatments specified by Upjohn. Lack of maintenance and inherent structural and environmental problems required extensive building conservation. A combination of design, conservation and craft skills were necessary to complete the project. Conservators assisted in the design of a new organ loft and developed finishing treatments essential in blending the loft with existing grain painted woodwork. Conservation work included cleaning, isolating, stabilizing, consolidating, and in-painting of the historic decorative treatment and its substrate.