Materials & Finishes
Every material on a KEYSTONE project is specified for how it behaves, ages, and reads in twenty years — not just at handover. These are the families we work with most.
Structural Expression
Materials that do work and look like it — raw, honest, and beautifully resolved.
#A09A93 Interior walls, wine caves, entry sequences. Forms leave their grain in the surface.
#C4A882 Perimeter walls, retaining elements. Each layer a geological record of the site.
#B8855A Structural members, rafters, beams. Left unfinished or oiled to read the growth rings.
#8B4513 Exterior cladding accents, gates, bridge elements. Oxidizes to a stable amber-rust.
Stone & Masonry
Quarried, cut, and set by hand. KEYSTONE sources all stone from verified regional suppliers.
#4A4A4A Floors, fireplace surrounds, kitchen counters. Dense, fine-grained, nearly imperviable.
#D4C9B0 Exterior paving, pool surrounds, bathroom tile. Softens with age.
#5C6670 Roofing, exterior cladding, wet areas. Extraordinary dimensional stability.
#F5F0E8 Powder rooms, primary baths, kitchen counters. Used precisely, not everywhere.
Wood & Millwork
Every wood species and finish specified for how it will age — not just how it looks at handover.
#C9A96E Wide-plank flooring, cabinet faces, wall paneling. Wire-brush reveals the ray fleck.
#3D2B1F Feature millwork, built-ins, stair treads. Fuming deepens the chocolate tones permanently.
#8B5E3C Exterior siding, pergolas, screen walls. Class A fire resistance without chemical treatment.
#9E7A50 Feature walls, barn doors, ceiling planks. Each board carries its own provenance.
Metal & Glass
Precision-fabricated, welded, and finished in-house by our millwork partner.
#2A2925 Window frames, doors, stair railings, kitchen hardware. Patina develops slowly over years.
#8B7355 Plumbing fixtures, cabinet hardware, switch plates. Unlacquered so it can develop character.
#E8F0EF Large pivot doors, fixed glazing, shower enclosures. No green cast — pure light transmission.
#C0C0C0 Kitchen appliances, commercial hoods, laboratory-grade counters. Hardest-working surface in the house.
Every material has a written specification.
Before any material leaves the distributor for a KEYSTONE site, it has a written specification: manufacturer, grade, thickness, finish, installation method, acceptable tolerance, and inspection criteria. We don't order 'the usual' — we order exactly what the drawings call out, verified against what arrives.
See how our pre-construction worksWant to explore materials for your project?
During Design phase, our director produces full material boards with vendor options and cost comparisons before any selection is locked.
Start a design conversation