How do I add sound privacy to an open-plan law office in a heritage building on Elgin Street?

Adding sound privacy to an open-plan law office in a heritage building on Elgin Street requires a layered approach that respects the building's protected character while meeting the confidential speech privacy standards your practice demands. The goal is typically to achieve a Speech Privacy Class (SPC) of at least 60, meaning normal conversation is unintelligible beyond the treatment zone — essential for solicitor-client privilege.Strategies That Work Within Heritage ConstraintsSince Elgin Street falls within Ottawa's Centretown Heritage Conservation District, exterior modifications are tightly regulated, and interior changes to heritage-designated buildings may require approval depending on the scope. The good news is that most acoustic privacy solutions are entirely interior and non-structural, so they typically fall outside heritage review. Start with a sound masking system — this is the single most cost-effective tool for open-plan office privacy. Systems like Cambridge Sound Management Qt or Lencore install above the ceiling tiles and emit a calibrated background noise that makes speech unintelligible beyond about 4.5 metres. For a typical 1,500-square-foot law office, expect to pay $4,000–$8,000 installed in Ottawa. Sound masking alone can improve perceived privacy by the equivalent of 8–10 STC points without touching a single wall.For meeting rooms and consultation spaces where truly confidential discussions happen, you will need physical sound barriers. Full-height partitions that extend from the structural floor to the structural ceiling deck — not just to the drop ceiling — are critical. A common mistake in heritage office conversions is building partitions only to the suspended ceiling grid, leaving a wide-open plenum above where sound travels freely between rooms. For these partitions, specify double 5/8-inch Type X drywall on each side with Rockwool Safe'n'Sound insulation in the cavity and Green Glue compound between drywall layers. This assembly can achieve STC 55–60 and costs roughly $25–$35 per square foot installed. A 10-by-9-foot partition wall would run approximately $2,200–$3,200.Do not overlook the doors — a solid-core door with acoustic seals on all four edges and an automatic door bottom is essential. A standard hollow-core office door rates around STC 20, while a proper solid-core acoustic door with perimeter seals can reach STC 35–40. Budget $800–$1,500 per door including hardware and seals. For the open-plan areas between private rooms, acoustic ceiling tiles with a high Ceiling Attenuation Class (CAC) of 35 or above will reduce sound flanking through the plenum. Replacing standard ceiling tiles with high-CAC options runs about $3–$6 per square foot.Heritage buildings on Elgin often have beautiful high ceilings, exposed brick, and hardwood floors — all highly reflective surfaces that amplify noise in open areas. Strategic placement of fabric-wrapped acoustic panels on walls and acoustic baffles suspended from ceilings can reduce reverberation without compromising the heritage aesthetic. Many manufacturers offer custom fabric options that complement period interiors. Budget $40–$80 per panel for quality fabric-wrapped absorbers.Before investing, have an acoustics professional conduct a baseline noise survey of your space. This identifies exactly where sound is leaking and which interventions will deliver the most privacy per dollar. For a heritage law office where client confidentiality is non-negotiable and the building's character must be preserved, professional assessment is especially worthwhile. The Ottawa Contractor Directory at justynrookcontracting.com/directory can connect you with acoustic and insulation professionals experienced with heritage commercial spaces in the Ottawa core.Looking for experienced contractors? The Ottawa Construction Network connects homeowners with qualified professionals:Reno's by Daniel FrauwallnerJC CarpentryJoe Imerti ContractingThe Deck Store IncSpeedy Pete's IncView all contractors →