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R12 Window Cleaning

Window cleaning service · Stockton, CA · reviewed since 2014

How the Experts Score is calculatedEach factor is scored 0–100 on absolute terms (standing in the category can only raise it), then weighted; problems flagged in review highlights or a recent slide in ratings are subtracted:Satisfaction 59%98+57.5Reliability 26%97+25.3Value 15%100+15.2Experts Score= 98Not enough data for replies to reviews; its weight is shared by the others.Grade A: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.98SCORE
AGradeLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#73 of 187 window cleaning servicesPosition by Experts Score among all companies we track in this category. · better than 61%
5.0 ★★★★★ 106 Google reviews · 24 photos
98%five-star reviews
4.99★last 12 monthsAverage stars on reviews from the last 12 months only.
0%1–2★ in 2 yearsShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
95%reviews answered by the owner
Nov 2026latest review

R12 Window Cleaning at a glance

Customers report that R12 Window Cleaning provides thorough services for windows, gutters, solar panels, and soft washing, often highlighting punctuality, clear communication, and fair pricing. The business has a 5/5 Google rating from 106 reviews, with the owner responding to 95% of them. One negative review noted a technician arriving late without proper equipment and attempting to increase the cost due to roof pitch, contradicting prior agreements.

  • Google rating: 5.0 out of 5 from 106 reviews (98% five-star).
  • Reviews on this page: 106 Google reviews (103 with written comments, 5 with photos).
  • Owner responses: the business replied to 95% of reviews.
  • Most recent review: November 1, 2026.
  • Service: Window Cleaner serving Stockton, California.

Data from Google, last updated November 4, 2026.

Score profile vs other window cleaning services

Score per factor (100 = best)Each factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: value and momentum; weakest: reliability.

Satisfaction98Reliability97Craft & service–Value100Momentum100Replies to reviews–Satisfaction: 98 (median 97)Reliability: 97 (median 97)Value: 100 (median 100)Momentum: 100 (median 100)
R12 Window CleaningWindow Cleaning Services median0 = centre, 100 = best
SatisfactionSatisfaction · 54% of the scoreRecency-weighted star average (2-year half-life), shrunk toward the category mean by review volume; the company’s own lifetime average as the prior; absolute: 4.0★ = 0, 5★ = 100.R12 Window Cleaning: 98/100 on this factor. Category median: 97.A
98
ReliabilityReliability · 24% of the scoreHow rarely jobs go badly: share of 1–2★ reviews — 60% the last 24 months (or the 20 newest if fewer), 40% all-time; 0% = 100, 15%+ = 0; the category percentile can only raise it.R12 Window Cleaning: 97/100 on this factor. Category median: 97.A
97
Craft & serviceCraft & service · penalty only, up to −10 pointsGoogle review highlights: Quality, Professionalism, Responsiveness, Punctuality — how rarely reviewers flag them as a negative, per review since highlights began; 0% = 100, 5%+ = 0. Subtracted from the score (up to −10), never averaged in — clean highlights are the norm, not a bonus.Not enough reviews for this factor yet. Category median: 99.–
–
ValueValue · 14% of the scoreCustomers’ own price verdicts (Great / Reasonable vs Overpriced) and Value highlights; 65% absolute (all “reasonable” ≈ 80, “great” = 100), the category percentile can only raise it.R12 Window Cleaning: 100/100 on this factor. Category median: 100.A
100
MomentumMomentum · penalty only, up to −10 pointsPenalises only a real slide: last-12-month average below lifetime (−0.5★ = 0). Still 4.8★+ over the last year, or steady/improving = 100. Subtracted from the score (up to −10), never averaged in.R12 Window Cleaning: 100/100 on this factor. Category median: 100.A
100
Replies to reviewsReplies to reviews · 7% of the scoreHow often the owner publicly replies to reviews under 5★ (1–4★). Needs 3+ such reviews, otherwise not counted; 65% absolute (80%+ replied = 100), the category percentile can only raise it.Not enough reviews for this factor yet. Category median: 85.–
–

Bar = this company · dark tick = category median.

Star ratings

106 Google reviews we collected

  • 5 stars10498%
  • 4 stars11%
  • 3 stars00%
  • 2 stars00%
  • 1 star11%

Praise vs complaints

Phrases our text analysis found in 103 written reviews

  • Praise22799%
  • Complaints21%

PriceGoogle asks reviewers whether the price was great, reasonable or overpriced; these are their answers.

Price verdicts customers left with their Google review

  • Great price3251%
  • Reasonable3149%
  • Overpriced00%
  • Not sure00%

Topic share

How often each topic comes up in the written reviews

  • Quality & results6227%
  • Staff & attitude5323%
  • Speed & response4017%
  • Would recommend3817%
  • Price & value157%
  • Communication125%
  • Honesty & trust94%

What customers talk about

We read 103 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.

  • “He is very courteous, a trustworthy professional, always provides quality job.”
  • “He is always professional and takes time to chat / visit with her - very thoughtful man !”
  • “So grateful for his meticulous work and how efficient he is at fulfilling his mission.”
  • “If you ever need similar type of service, I would highly recommend you to contact R12, you would not be disappointed.”
  • “Tim was professional, reasonable and my windows look fantastic!”
  • “Tim is very responsive, communicates well to set expectations and showed up when promised.”
  • “Highly recommend them for anyone looking for reliable, high-quality service”

People customers mention

  • Tim 35 reviews

praise complaint · found by our text analysis, Google review wording unchanged.

Reviews for your job

Customers hired R12 Window Cleaning for 6 kinds of job. Pick one to see what they paid and said.

Recent reviews

aleksandrLocal Guide · 20 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 weeks ago★★★★★

Been working with Tim and his crew second year in the row, great prices and customer services. I highly recommend them.

Gutter cleaning
Wen-Liang2 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★★★★★

Due to the height of our house, not many vendors are comfortable working on the roof top. That’s how we started our relationship with R12. Tim has provided us gutters and windows cleaning services a few years now. He is very courteous, a trustworthy professional, always provides quality job. His charges are also…

Reasonable priceGutter cleaningWindow washing
Tom4 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★★★★★

I've lived in the house for 8 years and the gutters have never been cleaned. After Tim cleaned them out I'm looking forward to a winter without the gutters overflowing from too much gunk. He also cleaned the transom windows and they look great! Thanks Tim!

Tricia4 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★★★★★

Tim did a fantastic job for my mother’s home today! He is always professional and takes time to chat / visit with her - very thoughtful man !

Kristie4 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · a month ago★★★★★

This was my first time working with Tim and I had a great experience. Tim will be my go to from now on!!!!

Interior & exterior window cleaning
Sandy5 reviewsTotal number of Google reviews this person has written across all businesses on Google Maps (not just this one). More reviews usually means a more experienced, trustworthy reviewer. · 2 months ago★★★★★

Tim always does a fantastic job cleaning our windows! Thorough, on time, courteous!

Great priceInterior & exterior window cleaning

Photos

Customer reviews

5.0 ★★★★★ 106 reviews on Google · rating breakdown

Reviews from Google, shown as published (original wording, unedited).

Jobs customers hired them for — from Google's service tags and the review text
Team members customers mention
Filter by topic — each topic is highlighted in the reviews in the same color
Mike Fossan4 reviewsTotal number of Google reviews Mike has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Very pleased with the cleaning of our gutters. On time. Professional

Response from the owner · 3 days ago

Thank you Mike for taking the time to write a review. Im really happy to have meet your expectations.

aleksandr korenblyumLocal Guide · 20 reviewsTotal number of Google reviews aleksandr has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Been working with Tim and his crew second year in the row, great prices and customer services. I highly recommend them.

  • Services: Gutter cleaning
Response from the owner · 2 weeks ago

Thank you Alex for taking the time to write a review. It has been a pleasure providing gutter cleaning to you. Looking forward to many more. Tim Zickuhr

Wen-Liang Hsu2 reviewsTotal number of Google reviews Wen-Liang has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Due to the height of our house, not many vendors are comfortable working on the roof top. That’s how we started our relationship with R12. Tim has provided us gutters and windows cleaning services a few years now. He is very courteous, a trustworthy professional, always provides quality job. His charges are also very reasonable. If you ever need similar type of service, I would highly recommend you to contact R12, you would not be disappointed.

  • Price assessment: Reasonable price
  • Services: Gutter cleaning, Window washing
Response from the owner · a month ago

Thank you Wen for taking the time to write a review and discuss the services provided. Im so glad to have met your expectations. And look forward to continuing to do so. Tim Zickuhr

Tom Anderson4 reviewsTotal number of Google reviews Tom has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

I've lived in the house for 8 years and the gutters have never been cleaned. After Tim cleaned them out I'm looking forward to a winter without the gutters overflowing from too much gunk. He also cleaned the transom windows and they look great! Thanks Tim!

Response from the owner · a month ago

Thank you Tom for taking the time to write a review. Andvto mention what services I provided. And remember you get a 1 year guarantee on the gutter cleaning. So if by some chance something does not perform up to standard. I will come back out at no expense to you. I really appreciate you choosing R12. Tim Zickuhr

Tricia Hinkle4 reviewsTotal number of Google reviews Tricia has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Tim did a fantastic job for my mother’s home today! He is always professional and takes time to chat / visit with her - very thoughtful man !

Response from the owner · a month ago

Thank you Tricia for taking the time to write a review. I appreciate the opportunity to clean windows for your amazing Mother. Roll Tide. Tim Zickuhr

Kristie Turner4 reviewsTotal number of Google reviews Kristie has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

This was my first time working with Tim and I had a great experience. Tim will be my go to from now on!!!!

  • Services: Interior & exterior window cleaning
Response from the owner · a month ago

Thank you Kristie for taking the time to write a review. Im so glad I was able to meet your expectations. Looking forward to working with you again. Tim Zickuhr

Sandy Hagerty5 reviewsTotal number of Google reviews Sandy has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Tim always does a fantastic job cleaning our windows! Thorough, on time, courteous!

  • Price assessment: Great price
  • Services: Interior & exterior window cleaning
Response from the owner · 2 months ago

Thank you Sandy for taking the time to write a review. It has been my pleasure providing you services over the years. Tim Zickuhr

Judy Sigward9 reviewsTotal number of Google reviews Judy has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Just had my home soft washed and windows cleaned by Tim. My house looks freshly painted and he removed a large hornet’s nest from the roof trim. So grateful for his meticulous work and how efficient he is at fulfilling his mission. Exceeding his customers expectations. I highly recommend him and his service. See you next year my friend!

  • Price assessment: Great price
  • Services: Power/pressure washing, Window washing
Response from the owner · 2 months ago

Thank you Judy for taking the time to write a review. And also for your review being so detailed. I really appreciate you. Tim Zickuhr

Ritu FavreLocal Guide · 29 reviewsTotal number of Google reviews Ritu has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Tim does great work! He has cleaned my windows and gutters for years. He is meticulous and responsible. So happy with all the work Tim did for me.

Response from the owner · 2 months ago

Thank you Ritu for taking the time to write a review. I really appreciate you choosing R12 for all the years. Reaching your expectations motivates me. Tim Zickuhr

Mo Dawud4 reviewsTotal number of Google reviews Mo has written across all businesses on Google Maps, not just this one.
Review from Google · view on Google
★★★★★

Tim is the “Go to person” for window , gutter and solar panel cleaning. He always does a great job. Thank you Tim for yesterday’s job. Mo

  • Price assessment: Great price
  • Services: Interior & exterior window cleaning
Response from the owner · 2 months ago

Thank you Mo for taking the time to write a review. I really appreciate you mentioning the services I have provided. Im glad to be able to meet your expectations. Tim Zickuhr

R12 Window Cleaning on Google Maps →

Business details