Last updated: August 13, 2025 • Covers: Columbia, Lexington, Forest Acres, and nearby 

Author – David Klintworth, Duck Power Wash, LLC CEO

Most residential exterior cleaning jobs in our area land between $395–$1,200+ depending on size, surface, access, and contamination. Below you’ll find clear per-square-foot pressure washing pricing, real local examples, and exactly how we protect your property.

How We Price (What Affects Your Quote)

• • Minimum invoice: $395 visit minimum (house wash minimum is $375, but the visit minimum governs).

• • House washing (2025):
    
    
    • • Non-porous (vinyl, painted wood, Hardie): $0.22/sq ft
        
    • • Porous (brick, stucco): $0.24/sq ft
        
    • • Includes: siding from gutter line to ground, 2–3x window rinses, taping/bagging locks, outlets, cameras; small/medium front porches included; screened porches extra.
    • • Heavy growth/oxidation or homes ~3,500–4,000+ sq ft are quoted in person.

• • Roof cleaning:
    
    
    • • Asphalt shingles: $0.35/sq ft (moss/heavy growth may increase price)
        
    • • Metal/tile: $0.50–$0.60/sq ft (moss/heavy growth may increase price)

• • Concrete (residential): $0.20–$0.25/sq ft; small back pads often $50–$75 unless larger/complex.

• • Concrete (commercial): $0.10–$0.20/sq ft (scale, logistics, after-hours access affect rate).

• • Deck/Fence: Highly variable by surface, condition, and whether you’ll stain afterward (we’ll evaluate on site).

• • Gutter cleaning (interior only): $2/ft (1st story), $2.50–$3/ft (2nd story); very full gutters cost more.

• • Exterior window cleaning (after a wash): $8–$20 per window (most are ~$10 without screens).

• • Commercial Siding
    
    
    • • Non-porous (metal, vinyl, painted wood, Hardie): $0.10–$0.20/sq ft
        
    • • Porous (brick, stucco): $0.10–$0.30/sq ft
        

Travel:30 minutes from downtown Columbia included; beyond that, a travel fee is added.

Why we’re different (luxury service): 9 years in business, OSHA 1910 safety certification, PWNA-trained, uniformed crews in branded trucks, detailed Standard Operating Procedures/checklists for every service, and a customer walk-through at the end of every job. We stand behind our work with a 100% satisfaction guarantee.

Residential Pricing Cheat Sheet

Service	Typical Rate	What’s Included	Common Additions
House Wash (non-porous)	$0.22/sq ft	Siding (gutters to ground), 2–3x window rinse, tape/bag sensitive items, small porch	Heavy organics, screened porches, complex access/features
House Wash (porous)	$0.24/sq ft	As above; adjusted chemistry/dwell/rinse for brick/stucco	Heavy organics, screened porches, complex access/features
Roof – Asphalt	$0.35/sq ft	Soft wash, plant/landscape protection, controlled rinse	Moss/lichen, complex rooflines
Roof – Metal/Tile	$0.50–$0.60/sq ft	As above; ladder/rope setup as needed	Moss/heavy soil, fragile tiles
Driveway/Sidewalks	$0.20–$0.25/sq ft	Pre-treat, surface clean, post-treat as needed	Red clay, rust, oil spills
Gutter Cleaning (interior)	$2–$3/ft	Debris removal, downspout flush	Very full gutters, access issues
Exterior Windows (post-wash)	$8–$20 each	Pure water pole for spot-free finish	Screens, high/awkward access

Minimum invoice: $395 (covers mobilization, protection, and quality controls that cheaper bids skip).

Commercial Pricing Cheat Sheet

Surface/Scope	Typical Rate	Notes That Affect Price
Building Siding – Non-Porous	$0.10–$0.20/sq ft	Height, lifts, after-hours, water access, logistics
Building Siding – Porous	$0.10–$0.30/sq ft	Stucco/brick often need longer dwell, careful rinsing
Concrete (sidewalks, lots)	$0.10–$0.20/sq ft	Scale, degreasers, traffic control, level of grime
Curbs	By scope	Linear-foot or bundled with flatwork

Sample Columbia Price Scenarios

• • Forest Acres vinyl home, 2,400 sq ft (light algae):
    2,400 × $0.22 = $528 (includes window rinses & protection steps).

• • Shandon brick/stucco home, 3,100 sq ft (heavier growth, older mortar):
    3,100 × $0.24 = $744 (older, softer mortar/stucco may require slower process).

• • Lake Murray asphalt shingle roof, 2,000 sq ft:
    2,000 × $0.35 = $700 (with landscape protection).

• • Driveway + walk (1,000 sq ft):
    1,000 × $0.20–$0.25 = $200–$250.

“Why is my smaller home $395?”
Example: 1,680 sq ft vinyl house → 1,680 × $0.22 = $369.60; visit minimum applies → $395.
(This ensures we can send trained techs, protect your property, and deliver a luxury-level result.)

Local Case Studies

Case Study 1: Columbia Rental Home (Residential)

• • Scope: Soft wash siding (fairly heavy green algae).

• • Risks & Protection: Bagged/taped outdoor speakers, Ring doorbell, cameras, wiring; kept landscaping wet pre/during/post.

• • Process: Apply 0.5–1% SH soft-wash mix; 5–10 min dwell; thorough controlled rinse; pure water final touches where needed.

• • Time on site: ~2.5 hours.

• • Price: $395 (1680 sq ft—minimum invoice applied).

• • Outcome: Landlord happy; fast turnaround with zero call-backs.

Case Study 2: Spring Valley Church (Commercial – Stucco/Dryvit + Concrete)

 

• • Challenge: Previous contractor had damaged portions of the stucco layer; heavy black/green growth.

• • Protection: Extensive taping of locks/outlets/electronic strikes; plant saturation throughout.

• • Scope: ~30,000 sq ft of siding, 8,700 sq ft of sidewalks, 1,450 LF of curb, plus memorial garden.

• • Process: Adjusted chemistry for porous stucco; multi-stage rinse; surface-cleaner on flatwork; post-treatment.

• • Crew Time: ~40 labor hours over 5 days.

• • Price: $10,846.

• • Result: “I don’t remember the last time it looked so clean”—multiple members commented it looked almost new; sidewalks now markedly less slippery when wet.

“A lower price usually costs more.” On fragile stucco, cheap cleaning = real risk. Our method restored curb appeal without further damage.

Our Process, Safety, and Equipment

• • Safety & training: OSHA 1910 safety certification; Pressure Washers of North America (PWNA) training; written SOPs and checklists for every service; customer walk-around after each job.

• • Chemistry: Standard 0.5–1% SH for siding (rarely higher, job-dependent); dwell 5–10 minutes (longer in cold/shade/heavy growth).

• • Pressure: While we own machines capable of up to 3,000 PSI, siding is cleaned with around 200 PSI—by the time the fan-spray reaches your wall from 5–10 feet away, it’s closer to garden-hose pressure.

• • Tools: Surface cleaners for flatwork; pure-water poles for spot-free exterior glass.

• • Paint safety: Some organic pigments in exterior paints can react with bleach. We educate upfront and follow strict protocols—details in our article:
     👉 Soft Washing & Organic Pigment Paint: Preventing Bleach Damage
    

Older neighborhoods (Shandon, Rosewood): Softer mortar and stucco, plus age-related holes/cracks, require slower chemistry, lower agitation, and targeted rinsing. This craftsmanship is built into our pricing.

Busy Season & Scheduling

We clean year-round. Peak demand in May–July and October–December (overall busy April–December).
 Our current pricing is based on scope, not how full the calendar is (subject to change without notice). Booking early secures the date you want.

FAQs

Why do you cost more than some companies?
 We’re a luxury provider: trained, insured, uniformed, and equipped with professional-grade gear. We communicate, protect property meticulously, and stand behind the work with a 100% satisfaction guarantee. Cheaper bids often skip protection steps (taping/bagging, plant care), use harsh pressure, and leave risk on you.

Is soft washing safe for older stucco and brick?
 Yes—with the right chemistry and dwell time plus gentle rinsing. Older stucco/dryvit and soft mortar demand patience and experience. Our process avoids the damage you see from “blasting.”

Do you charge by the hour or by square foot?
 Most services are quoted per square foot with a $395 minimum invoice. Complex homes over ~3,500–4,000 sq ft or with special risks are usually quoted in person.

Do you offer financing?
 Yes—Wisetack financing up to $25,000 on qualifying projects.

What if I’m not satisfied?
 We do what it takes to make it right—100% satisfaction guarantee.

 

Call or Book a Quote

Call/Text: 803-386-8460 • Website: https://803powerwash.com/
 Serving Columbia, Lexington, Forest Acres, and nearby communities.

Personal Note from David

“I expanded my window cleaning company into power washing in 2020 after realizing Columbia needed high-quality, property-safe exterior cleaning. I used to think pressure washing was just ‘waving a wand at concrete.’ The truth? That’s maybe 1% of what we do. The rest is chemistry, materials knowledge, and a whole lot of care.” — David Klintworth

Glossary (fast definitions):

• • Soft wash: Low-pressure application of cleaning solution followed by a controlled rinse. Safer for siding, roofs, stucco.

• • SH (sodium hypochlorite): Active ingredient (“pool shock”) used in most exterior cleaning mixes. See our paint safety guide here.

• • PSI/GPM: Pressure (pounds per sq in) and water flow (gallons per minute). We keep siding well under “pressure washer” levels—often similar to a garden hose pressure when the flow hits the surface.

• • Porous vs non-porous: Brick/stucco = porous, vinyl/painted wood/Hardie = non-porous. Porous surfaces need different chemistry/time.

• • Dwell time: Controlled time a solution sits to loosen organics (typically 5–10 minutes, longer in winter/shade).

                    Surface cleaner: A tool that delivers an even, streak-free clean on flatwork like                                                          driveways/sidewalks.