How to Restore the Exterior of an Older Boston Building

Assessment Before Any Work Begins

The first step in any exterior restoration project is a thorough condition assessment — walking the entire building envelope, identifying all failure modes, and understanding what caused them. In Boston's older buildings, common conditions include: failed caulk at window and door perimeters allowing water infiltration, delaminating paint from prior improper preparation, mortar deterioration in masonry, wood rot at trim and sill ends, and lead paint that requires EPA RRP protocol. Treating the symptoms without understanding the causes produces temporary improvements that fail again. NPS Preservation Briefs →

The Correct Surface Preparation Sequence

For wood-frame Boston buildings, the restoration sequence is: power wash to remove mildew, dirt, and chalking paint — then allow to dry completely (48–72 hours minimum). Probe all wood for rot and replace or repair compromised sections before any coating goes on. Scrape all loose and failing paint back to sound substrate. Sand transitions smooth. Caulk all gaps at windows, doors, trim joints, and penetrations with a paintable polyurethane or siliconized acrylic caulk. Prime all bare wood with oil-based or shellac primer. Then — and only then — apply finish coats. Skipping any step in this sequence produces a restoration that fails within 2–4 years. Old House Journal restoration resources →

Masonry Restoration Considerations

Boston has significant masonry building stock — brick triple-deckers, brownstone row houses, and commercial buildings with brick facades. Masonry restoration requires understanding that mortar is designed to be sacrificial: it's softer than brick face and weathers first, protecting the brick from damage. Repointing with modern Portland cement mortars that are harder than the historic brick causes spalling and accelerated brick deterioration. Historic masonry repointing requires lime-based or Type N mortar compatible with the original construction. This is a detail that matters enormously on Back Bay and South End properties. National Trust for Historic Preservation →

Paint Selection for Boston Historic Exteriors

Standard elastomeric coatings — thick, rubbery waterproofing paints — are frequently inappropriate for historic Boston buildings. They trap moisture, are virtually impossible to remove without damaging the substrate, and visually obscure architectural detail. For wood-frame historic buildings, vapor-permeable oil-based or high-quality acrylic latex paints that allow the building to breathe are appropriate. For masonry, penetrating silane/siloxane sealers or breathable mineral silicate paints are the correct choice. We select products appropriate to the specific substrate and historic context of each property. Boston Landmarks Commission material guidelines →

Lead Paint Protocol on Boston Historic Buildings

Pre-1978 Boston historic buildings contain lead paint — often multiple layers from decades of repainting. Work that disturbs lead paint requires EPA RRP certified contractors following specific containment, cleanup, and disposal procedures. We're certified and experienced with lead paint work on historic properties, and we document all RRP compliance for clients who need records for insurance, historic tax credit applications, or property management compliance. EPA RRP requirements →