Water damage restoration service · Tigard, OR · reviewed since 2014
iHow 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 55%81+44.2Reliability 24%51+12.4Value 14%100+14.1Replies to reviews 7%48+3.4Craft & service penalty73−2.7Experts Score= 71Grade B: A = 80+, B = 60–79, C = 40–59, D = 20–39. Needs 10+ reviews.71SCORE
BGradeiLetter from the Experts Score: A = 80+, B = 60–79, C = 40–59, D = 20–39, F = under 20.
#160 of 184 hazardous material removaliPosition by Experts Score among all companies we track in this category. · better than 13%
4.9★★★★★235 Google reviews · 21 photos
95%five-star reviews
15%1–2★, last 20 reviewsiShare of 1–2★ reviews in the last 24 months — or the 20 newest reviews when the company had fewer than 20 in that time.
Google reviewers rate Certified Indoor Environmental 4.9 out of 5 stars based on 235 reviews, with the owner responding to 45 percent of them. Customers frequently cite punctuality, professional communication, competitive pricing, and thorough cleanup during mold remediation and ventilation projects. However, low-star reviews highlight concerns about workmanship errors, such as improper vent installation, and a lack of follow-up when mold recurs after the one-year warranty period expires.
Google rating: 4.9 out of 5 from 235 reviews (95% five-star).
Reviews on this page: 235 Google reviews (204 with written comments).
Owner responses: the business replied to 45% of reviews.
Most recent review: November 7, 2024.
Service: Hazardous Material Removal Service serving Tigard, Oregon.
Data from Google, last updated November 3, 2026.
Score profile vs other hazardous material removal
Score per factor (100 = best)iEach 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 satisfaction; weakest: replies to reviews.
This companyHazardous Material Removal median0 = centre, 100 = best
SatisfactioniSatisfaction · 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.Certified Indoor Environmental: 81/100 on this factor. Category median: 92.A
81
ReliabilityiReliability · 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.Certified Indoor Environmental: 51/100 on this factor. Category median: 92.C
51
Craft & serviceiCraft & 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.Certified Indoor Environmental: 73/100 on this factor. Category median: 97.B
73
ValueiValue · 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.Certified Indoor Environmental: 100/100 on this factor. Category median: 100.A
100
MomentumiMomentum · 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.Not enough reviews for this factor yet. Category median: 100.–
–
Replies to reviewsiReplies 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.Certified Indoor Environmental: 48/100 on this factor. Category median: 67.C
48
Bar = this company · dark tick = category median.
Star ratings
235 Google reviews we collected
4.9of 5
5 stars22395%
4 stars73%
3 stars00%
2 stars00%
1 star52%
Praise vs complaints
Phrases our text analysis found in 204 written reviews
99%praise
Praise47299%
Complaints61%
Topic share
How often each topic comes up in the written reviews
7topics
Staff & attitude12426%
Speed & response10923%
Price & value6614%
Would recommend6013%
Quality & results5812%
Communication419%
Honesty & trust204%
What customers talk about
We read 204 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“He was very knowledgeable and was able to assess the ventilation issues and condition of the roofing sheathing.”
“They are always quick to get out, extremely professional, and competitive with their bids.”
“Very reasonable costs for these professional services.”
“I received the estimate and they were going to charge me $3600 for installing a roof vent and spray some mold spots.”
“Certified Indoor is my Go-To for all things MOLD/Fungi related.”
“Avoid this company.”
“Their attention to detail and follow through was exceptional.”
“They answered all my questions and made me feel comfortable about the process.”
“When it comes to the actual mitigation, there's no company I trust more!”
People customers mention
Cleaning14 reviews
Mold8 reviews
Realtor4 reviews
praise complaint · found by our text analysis, Google review wording unchanged.
Reviews for your job
Customers hired Certified Indoor Environmental for 8 kinds of job. Pick one to see what they paid and said.
JJeffLocal Guide · 12 reviewsiTotal 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 year ago★
Certified recently sold to a new company called Alliance and now it’s NuBilt construction. Certified was a good company and fair pricing. I recently called the new company to have them do a warranty check from the old certified work and install a roof vent missed from Certified. I received the estimate and they were…
DDanielLocal Guide · 20 reviewsiTotal 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 years ago★
Hired certified to come remediate my attic, did a full clean / added vents. 12.5 months later we inspect the attic and the mold is back. Certified won’t come remediate again because it’s over 1 year. I’ve left multiple calls with the team but have yet get any sort of call back after my initial contact where they said they would ask the manager.
Ttasi5 reviewsiTotal 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. · 3 years ago★★★★★
Project Manager Freddy Rodriguez came out to inspect my attic. He was very knowledgeable and was able to assess the ventilation issues and condition of the roofing sheathing. I appreciate his expertise.
Mold inspection
DDavid4 reviewsiTotal 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. · 3 years ago★★★★★
Certified Indoor is my Go-To for all things MOLD/Fungi related. They are always quick to get out, extremely professional, and competitive with their bids. When it comes to the actual mitigation, there's no company I trust more!
RRyanLocal Guide · 22 reviewsiTotal 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. · 3 years ago★★★★★
Your onsite personnel we very polite and professional. They answered all my questions and made me feel comfortable about the process. I would totally use them again and recommend them to my friends.
JJean6 reviewsiTotal 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. · 3 years ago★★★★★
Jose and Ovbelin were wonderful. They stayed busy and answered all our questions. Very polite and cleaned up after themselves. Very pleasant experience. This job was my personal residence but I am also a long time Realtor in the area I would highly recommend. Great pricing and great work! Pictures before and after were great!
Certified recently sold to a new company called Alliance and now it’s NuBilt construction. Certified was a good company and fair pricing. I recently called the new company to have them do a warranty check from the old certified work and install a roof vent missed from Certified. I received the estimate and they were going to charge me $3600 for installing a roof vent and spray some mold spots. That’s insane! This company should be avoided with attempting to charge people that ridiculous cost. Certified charged me for mold remediation for my entire attic $1200. This new company is a dumpster fire. Avoid this company.
Good luck staying in business with those ridiculous prices!
D
Daniel EricksonLocal Guide · 20 reviewsiTotal number of Google reviews Daniel has written across all businesses on Google Maps, not just this one.
Hired certified to come remediate my attic, did a full clean / added vents. 12.5 months later we inspect the attic and the mold is back. Certified won’t come remediate again because it’s over 1 year. I’ve left multiple calls with the team but have yet get any sort of call back after my initial contact where they said they would ask the manager.
K
kelly konze-rinckeLocal Guide · 9 reviewsiTotal number of Google reviews kelly has written across all businesses on Google Maps, not just this one.
**Updated/2nd Review May 2023** If you are thinking of using this company, you may want to reconsider. After using Certified in May 2022 I had insulation installed and a new mold issue arose due to poor baffle placement blocking the smart vent air flow. Certified (now Alliance) called me the day after sending the evaluation invoice to see if I had a chance to pay it yet! In addition to that, the invoice was for $150 evaluation and the eval I received was an exact duplicate from last May, even though there had been many changes in the attic ventilation. When I tried to speak with Nick (after the roofer had also called him) he was more interested in defending his evaluation than he was in listening to the feedback of my experiences with the company and his evaluation. Nick is clearly unable to put his own ego aside and get out of his own way long enough to provide the customer service needed here. And when I asked why he hadn't contact me after being made aware by the roofer of the duplicate evaluation , he could only offer excuses about being so busy. He agreed to review the costs for a new remediation, but ended up only taking off a small percentage that really made no difference. Needless to say, I went with another company who was more personable, thorough and offering a better price for the work. WITH a guarantee, which Certified/Alliance did not offer but certainly should have in this situation.
(initial review, May 2022) Every staff member I interacted with was absolutely fabulous! From the office staff to the technicians, they were all polite, knowledgeable and professional. Thanks so much, Certified Environmental Team!
Project Manager Freddy Rodriguez came out to inspect my attic. He was very knowledgeable and was able to assess the ventilation issues and condition of the roofing sheathing. I appreciate his expertise.
Services: Mold inspection
D
David Girard4 reviewsiTotal number of Google reviews David has written across all businesses on Google Maps, not just this one.
Certified Indoor is my Go-To for all things MOLD/Fungi related. They are always quick to get out, extremely professional, and competitive with their bids. When it comes to the actual mitigation, there's no company I trust more!
Positive: Responsiveness, Punctuality, Quality, Professionalism, Value
Your onsite personnel we very polite and professional. They answered all my questions and made me feel comfortable about the process. I would totally use them again and recommend them to my friends.
Positive: Responsiveness, Punctuality, Quality, Professionalism, Value
Services: Mold inspection
J
Jean Trostel6 reviewsiTotal number of Google reviews Jean has written across all businesses on Google Maps, not just this one.
Jose and Ovbelin were wonderful. They stayed busy and answered all our questions. Very polite and cleaned up after themselves. Very pleasant experience. This job was my personal residence but I am also a long time Realtor in the area I would highly recommend. Great pricing and great work! Pictures before and after were great!
Positive: Responsiveness, Punctuality, Quality, Professionalism, Value
Services: Mold remediation
J
John CantwellLocal Guide · 17 reviewsiTotal number of Google reviews John has written across all businesses on Google Maps, not just this one.
You guys are simply the best! From start to finish you have been professional. Enviromental did some mold remediation for me. They were excellent ! From the receptionist to the technician everyone was professional and responsive.I was on a deadline and they met the deadline with ease.Call them you won't be disappointed.
Positive: Quality, Professionalism
Services: Mold inspection
Response from the owner · 6 years ago
Thank you for your insightful review, John! We strive to meet all of our customer deadlines and we are glad that we were able to help meet yours! We look forward to working with you on the next project!
C
Christian Storm5 reviewsiTotal number of Google reviews Christian has written across all businesses on Google Maps, not just this one.
They came in and did some investigating and got back to us quickly with a plan of action, cost, and schedule. They followed through on everything in a timely manner and gave us tons of pictures and reports for our records and to help our tenants feel safe.
Our upstairs attic had mold issues due to inadequate bathroom exhaust venting. Certified Indoor Environmental submitted a very competitive bid to clean the mold as well as properly vent the two bathroom exhaust fans, installing ducting and a roof duct cap. The work was done on time and on budget. We couldn't be happier. Well done!
Positive: Responsiveness, Punctuality, Quality, Professionalism, Value
