In pre-war NYC apartments, the question of whether to preserve or replace original plaster comes up constantly — when water damage occurs, when major renovation happens, when a contractor suggests it would be "easier" to just put up drywall. Here's the honest comparison.
Why Original Plaster Is Better
Density and Sound
Original three-coat plaster is significantly denser than 5/8-inch drywall. This density translates to meaningfully better soundproofing from adjacent apartments. In a NYC co-op where neighbor noise is a quality-of-life issue, preserving original plaster matters.
Thermal Mass
Dense plaster walls moderate temperature swings more effectively than drywall, contributing to the consistent, comfortable temperature that pre-war apartments are known for even with steam heat.
Appearance
Original plaster has a surface quality that drywall cannot replicate — a subtle variation in texture and a matte depth that paint looks different on than it does on drywall. Venetian plaster and other decorative finishes look more authentic and more beautiful on original plaster walls. It's not imaginary — experienced designers can often identify original plaster from across the room.
Value
In NYC's premium residential market, original plaster walls in good condition are a legitimate selling point — not a universal one, but recognized by buyers and designers who understand what they're looking at.
When Drywall Makes Sense
Drywall replacement makes sense when: original plaster is severely deteriorated (blown, water-damaged, structurally compromised throughout a large area); when major systems work (plumbing, electrical) requires opening walls anyway; or in rooms where finish quality matters less than project economics. In these situations, 5/8-inch Type X drywall with appropriate finishing is a reasonable substitute, not a betrayal of the building.
The Hybrid Approach
Many renovation architects recommend a hybrid: preserve original plaster in living spaces, bedrooms, and areas where the aesthetic benefit is highest; replace with drywall in kitchens, bathrooms, and utility areas where systems access is more important than surface quality. This approach preserves what's valuable without letting preservation puritanism drive up renovation costs unnecessarily.