Mildew & Mold Treatment Boston

Your trusted experts

A Ryan Painting crew member wearing a Ryan Painting shirt repaints trim after mildew was removed from the front porch on a two-family home in Roslindale.

Stop mold in its tracks before you paint—or after.

Mildew and mold don’t just look bad—they destroy paint adhesion and can lead to rot. Whether prepping for painting or maintaining your exterior, treating mold properly is essential.

Ryan Painting performs mold and mildew removal using biocide solutions and sealant primers in homes across Dorchester, South Boston, and Hyde Park.

  1. Apply biocide wash and let dwell

  2. Light scrub or rinse

  3. Apply mold-sealing primer (if painting follows)

  4. Optional topcoat application

Typical Cost

Mildew and mold treatment services typically cost $300–$1,200 depending on extent and surfaces.

Case Study

A Jamaica Plain homeowner had black mildew around their shaded front porch. We treated, washed, primed and repainted, stopping the issue from returning.

Front porch in Jamaica Plain, recently washed and rid of mildew before priming and painting project on siding and decking.

Why Mold Comes Back (And How to Prevent It)

Mold and mildew return when the underlying moisture problem isn't addressed. Painting over mold without treatment guarantees it will bleed through within months.

Common causes in Boston homes:

  • Poor ventilation in bathrooms, kitchens, and basements - trapped moisture feeds mold growth

  • Shaded exterior walls - north-facing siding and areas under tree canopy stay damp longer

  • Leaking gutters and downspouts - water splashing onto siding creates persistent moisture

  • Interior humidity - Boston's humid summers (July-August especially) accelerate mold growth on poorly ventilated surfaces

Our prevention approach:
After treating existing mold, we apply a mold-resistant primer (like Zinsser Mold Killing Primer) before topcoating. For exterior surfaces, we recommend annual visual inspections of shaded walls and cleaning at the first sign of green or black growth — early treatment prevents the need for full remediation.

If your mold issue is connected to a pressure washing or exterior painting project, we can bundle the treatment as part of the prep work.

Our painters take pride in their work, and it shows in the results we deliver on every job.

FAQs

Can I paint over mildew?

Only after treating—otherwise it will bleed through.

Is this safe to do with kids or pets around?

 Yes—we use low-toxicity products and provide guidance for safe reentry.

More services, same quality

OUR SERVICES
OUR SERVICES

 Let’s stop mildew before it spreads—book your treatment today.

TREAT MY HOME
TREAT MY HOME

This service is part of our pressure washing service, offered by our Boston painting company.