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Renovation projects in homes, apartment buildings, offices, retail spaces, and warehouses often uncover hazards that are not clearly visible and are frequently overlooked during planning. When disturbed, they can pose serious health risks, trigger regulatory violations, delay construction schedules, and may significantly increase overall project costs.
For commercial property owners, landlords, facility managers, and homeowners, understanding these risks before construction begins is critical. Below are five commonly overlooked contaminants found in residential and commercial buildings, along with guidance on how to manage them safely and responsibly.
Lead-based paint is commonly found in old homes on floors and behind painted walls, trim, windows, and doors. It is also prevalent in commercial spaces converted from older residential or industrial use, schools, childcare facilities, and multi-family housing units.
Lead-based paint may appear intact and stable. However, activities such as sanding, cutting, drilling, scraping, or demolition can release microscopic lead dust into the air and onto surrounding surfaces. This dust is not always visible, which makes it very dangerous, especially for children.
Risks
How To Handle It Safely
Asbestos is commonly found in many building materials such as floor tile and mastic, pipe/boiler insulation, ceiling tiles, textured wall and ceiling coatings, roofing materials, exterior siding, and fireproofing materials.
Asbestos-containing materials (ACMs) are often stable when left undisturbed. Because of this, they may not raise concerns until renovation work cuts, drills, or removes them. Many building materials that look ordinary can contain asbestos, especially in properties built before the 1980s. In Colorado, all buildings are required to be inspected before renovation by qualified and licensed personnel.
Risks
How To Handle It Safely
Mold is commonly found behind walls and above ceilings, under flooring and carpet padding, inside HVAC systems and ductwork, and around areas affected by past roof leaks, plumbing failures, or flooding.
Mold growth is frequently hidden behind finished surfaces. Renovation may be the first time walls, ceilings, or flooring are opened, revealing contamination that has developed over time. In some cases, staining or odors may have been painted over or ignored, potentially exaggerating the problem further.
Risks
How To Handle It Safely
Silica dust is commonly released into the air during activities such as concrete cutting or grinding, masonry, brick and stone work, tile removal and surface preparation, and demolition of plaster, drywall or cement-based materials.
Silica exposure is sometimes viewed strictly as a construction issue. However, during tenant improvements or phased renovations in occupied buildings, dust control becomes both a health and compliance concern. Fine particulates can travel beyond the work area if not properly handled and contained thereby affecting large areas.
Risks
How To Handle It Safely
Legacy chemical contamination is contamination from previous operations or activities that have affected properties in the past. Such activities come from former industrial or warehouse sites, auto repair shops, laboratories, dry cleaners, medical facilities, properties undergoing change of use, or sites with illegal drug manufacturing operations.
Renovation plans may move forward without a thorough understanding of how the property was previously used. Older buildings may have experienced chemical storage, solvent use, spills and improper fuel handling, or illegal drug manufacturing processes that were never fully documented.
Risks
How To Handle It Safely
Can renovations spread lead dust?
Yes. Activities such as sanding, cutting, drilling, or demolition can release lead dust from painted surfaces, even if the paint appears intact.
Do residential, schools, and commercial buildings still contain asbestos?
Yes. all buildings constructed before the 1980s, and some built after, still contain asbestos. An asbestos survey is always required before renovation or demolition regardless of the age of the building.
Is mold testing necessary before remodeling?
Mold testing is recommended when there are visible signs of past water damage, staining, musty odors, or known moisture issues.
Who is responsible for environmental hazards during renovations?
In most cases, responsibility rests with the property owner. However, contractors, property managers, and tenants may also have obligations depending on the scope of work, lease agreements, and applicable regulations.
Should testing and professional environmental cleanup for real estate be performed before renovations begin?
Yes. Proactive testing reduces the likelihood of unexpected discoveries that cause delays, added expenses, or regulatory complications.
Renovations provide an opportunity to improve and modernize buildings, but they also carry environmental risk when hidden contaminants are disturbed. Careful planning, proper testing, and professional remediation protect occupants, workers, and property value.
Before beginning demolition or remodeling, ensure that environmental hazards are identified and managed correctly by contracting a trusted company like Colorado Hazard Control. A proactive approach can prevent costly interruptions and support a safer, more efficient project from start to finish.
Contact CHC today to discuss your testing and abatement needs.