House Washing Services in Lexington, MA
Low-pressure soft washing that clears algae and street grime from homes and condo buildings.
Free Estimate
Drive from the Battle Green out along Massachusetts Avenue and the housing changes every few blocks. Two-hundred-year-old clapboard gives way to 1960s splits and long contemporary elevations set back under mature oaks. Different siding, same problem: shade holds moisture, and moisture grows algae. We clean Lexington homes by soft washing. Low pressure moves the water while a biodegradable detergent breaks down algae, mildew and organic film at root level, so growth does not return in a few weeks. Paint, caulk lines and old wood stay undisturbed. Most houses take two to four hours.
Why High-Pressure Washing Is the Wrong Tool on a Lexington Home
A pressure washer strips what it hits. On a town where one street holds original clapboard and the next holds 1965 vertical board siding, that is a real risk to the finish you paid for.
- Forces water behind siding — Pressure pushes moisture past lap joints and under trim, where it sits, swells the wood and lifts paint months later.
- Erodes old paint and putty — Original clapboard and window glazing on Lexington's older homes give way fast under a narrow fan.
- Scars soft and engineered surfaces — Cedar, T1-11 and older vinyl mark permanently. The lines show in raking afternoon light.
- Only knocks growth off the surface — Algae roots stay in the pores of the substrate. Streaks return within a season.
- Damages window seals and screens — Contemporary homes with large glass walls have a lot of vulnerable perimeter to protect.
Soft washing reaches the same result chemically, at garden-hose pressure, with nothing driven into the building.
What's Included in Our House Washing Services in Lexington
Full exterior siding wash
Every elevation is treated, including shaded north and east walls where growth runs heaviest.
Soffits, fascia and eave undersides
Wide overhangs stay damp and collect a gray film. These get worked directly, not rinsed from a distance.
Trim, corner boards and window surrounds
Detail areas are cleaned by hand where needed so the lines look sharp against clean siding.
Less trapped moisture in the structure
Organic growth stays wet. Clearing it off siding, soffits and trim lets those surfaces dry properly after rain.
Doors, shutters, railings and light fixtures
Painted and vinyl details get the same detergent and gentle rinse.
Mid-Century, Split-Level and Contemporary Homes
Lexington has an unusually deep stock of 1950s through 1970s houses, and they weather differently than the colonials near the center. Long walls and deep shade make every flaw legible.
Long, low horizontal elevations
A split-level presents one continuous run of wall with nothing to interrupt the eye, so a streak reads across the whole front.
Wide eave overhangs
Deep eaves shelter the top band of siding from rain. That strip never washes naturally and holds mildew longer than anything else on the building.
Vertical board siding and T1-11
Grooves channel water downward and hold organic matter in the seams. These need dwell time and a thorough flush, not scrubbing.
Large glass walls and surrounding trim
Contemporary homes carry a lot of glass. We protect seals, clean the trim around them, and leave the glass streak-free.
Flat and low-slope roof edges
Drip lines at low-slope edges deposit dirt in a consistent band along the wall beneath. That band is treated directly.
Painted and stained finishes from past decades
Older coatings sit thinner than modern paint. Low pressure keeps them where they are.
Benefits of House Washing in Lexington
Streaking disappears, not just fades
Root-level treatment clears green and black growth instead of masking it. Walls stay clean through the next humid stretch.
Your paint job lasts longer
Algae and mildew hold moisture against the coating and break it down. Clearing them regularly adds years before the next repaint.
Curb appeal matches the street
Upkeep standards in Lexington are high. A clean exterior keeps your house consistent with what is around it.
Less trapped moisture in the structure
Organic growth stays wet. Clearing it off siding, soffits and trim lets those surfaces dry properly after rain.
One visit, no disruption
We work from the ground with soft-wash equipment, finish in a few hours, and leave the property the way we found it.
Working Near Lexington's Historic Districts
Parts of Lexington fall inside designated historic districts, and homeowners there are careful about anything touching the exterior. Cleaning is maintenance, not alteration, but it still has to be done without changing or harming original material.
Nothing abrasive is used
No sanding, no scrubbing pads, no high-pressure fan on original surfaces. Detergent and a gentle rinse only.
Original clapboard and trim get extra care
Weathered paint and old wood are tested on a small area first, then treated with reduced dwell time if they need it.
Appearance is preserved, not altered
A wash removes biological growth. Color, texture, patina and original material stay exactly as they are.
Condition is documented before and after
Photographs of each elevation go on file, so there is a clear record of the house on arrival.
Check with the town before finish work follows
Planning to repaint, replace trim or change a color after the wash? Contact the Town of Lexington first to confirm what applies to your property. We do not advise on that; we clean.
How We Work
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Walk the property and quote it
We look at siding type, exposure and how heavy the growth is. The price covers the job as described, with no on-site revision.
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Protect plantings and prep the site
Shrubs, beds and delicate landscaping get pre-wetted and covered before detergent goes up. Fixtures and outlets are shielded.
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Apply, dwell, rinse
Detergent goes on at low pressure and gets time to break down the growth, then each elevation is rinsed clean from the top down.
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Inspect with you before we leave
We walk the house together, revisit any spot you point out, and confirm plants and hardscape are rinsed down.
Why Lexington Homeowners Choose NZ Powerwash
- Fully insured, certificate sent before arrival — You get our certificate of insurance by email ahead of the appointment, not after you ask for it.
- Plant-safe biodegradable detergents — Our products break down after use and are chosen to be safe around established beds, lawns and mature trees.
- Framingham-based, close by — We are a short drive from Lexington, which means real scheduling windows and quick follow-up if you need us back.
- The quote is the price — What we write down is what you pay. No surcharge discovered halfway through the job.
- Direct answers about method and product — Homeowners here ask specific questions. We will tell you exactly what goes on your house and at what dilution.