John Hamlin has filed a federal lawsuit in Oklahoma’s Western District against Pella Corp. (Pella). Hamlin is looking to recover alleged damages from defendant (Pella) for the manufacture and sale of Architect Series windows alleged to be defective, which he claims leaked and resulted in premature wood rot and damage to the windows. Hamlin claims the damage was due to design and manufacturing defects that could not be repaired.

According to Hamlin’s complaint, the alleged defective windows resulted in a loss of

$125,000 “upon the sale of a house.”

“Defendant’s acts and omissions in the design, manufacturing and its sale and delivery of defective Architect Series windows with failure to timely and properly disclose such defects after they became know constitutes common law fraud, misrepresentation and breach of duty,” a portion of Hamlin’s complaint reads. “In addition, following discovery, this action may have class action status requiring an amended complaint.” According to Hamlin, Pella failed to disclose in a timely fashion that there was a “substantial risk that their Architect Series windows would develop leaks due to design and manufacturing defects and that the defects might not be exhibited until after any warranty period expired.” He alleges that Pella was aware of a substantial risk prior to selling its windows. “[Pella] intentional[ly] and maliciously failed to disclose to plaintiff or his builder the risks or inspect the sold windows after discover of their design and manufacturing defects,” Hamlin alleges through a filed complaint.


Hamlin purchased Pella’s Architect Series Windows through his builder for installation in a home for $80,514.96, according to his complaint. In addition, window installation costs and interior window painting costs were incurred. Pella’s windows had an aluminum exterior with a wood interior, with the aluminum exterior cladding designed and manufactured to protect the interior wood.

Hamlin listed the home for sale in June 2019 for a sales price of $527,000. After the home was inspected, the homebuyers and Hamlin learned all of Pella’s windows were deemed to be “defective with rotted wood needing replacement caused by design and manufacturing defects.”

“[Hamlin’s] contract of sale had to be reduced to $402,000 on June 25, 2019 for the cost of window removal, cost of replacement windows and window installation. Plaintiff notified defendant’s distributor for sales in Oklahoma, of the problem via email and recommended the distributor inspect the windows prior to the closing of the sale,” a portion of the complaint reads.

Hamlin reports that the closing of the sale was July 15, 2019. The Womble Company refused to inspect the property prior to the sale without an inspection payment of $810, according to the filed complaint. “[An] investigation revealed that the defendant’s Architect Series windows aluminum exterior cladding had design and manufacturing defects allowing rain water to drip in to the interior wood and that the rain water dripping in to the interior wood over the years resulted in rotted wood and internal destruction of the windows,” a portion of Hamlin’s complaint alleges.

Hamlin also alleges Pella was aware of its alleged defect since 2006, as there have been previous class action litigations against the manufacturer, he says. According to Hamlin, when he contacted the company in 2014 he was not informed about the alleged issues involving its windows.

“[Pella] breached its duty to disclose to plaintiff that its Architect Series windows had a substantial risk of leaking because of design and manufacturing defects and that the leakage would result in rotted wood and that after the purchase of the windows defendant breached its duty to inform plaintiff that defendant’s Architect Series windows had a very high likelihood of leaking that would result in rotted wood,” a portion of Hamlin’s complaint reads.

Pella has not responded with comments as of press time.


  1. Do you know the status of this lawsuit? Asking for a client with these windows

  2. Same issue on the Architect Series we bought in early 2000’s. Bottom rails are rotting out on each sash. Know of one other person w/same issue on $30,000 worth of windows from 2003. Wish we’d have looked at Anderson!

  3. I had my windows installed in 2004. Just found same issue. Had pella come and assess they want to replace the windows that are affected for ~75k.

    Crazy. I live in Ada Ok

  4. My house Pella windows (more than 50 windows) were installed in 2000 with the same issue. I will appreciate it if someone can provide the Pella contact information of the claims.

  5. Was told the rot was only on the proline. Is there a lawsuit for the architect line as well. Have the same problem.

  6. I also have the same problem. Most of my casements have the bottom of the casement rotted out as well as the sash. Can’t open the windows anymore for fear they’ll completely fall apart and we’ll not be able to close them.

  7. We just discovered that all of our Pella impervia line have done the samething. Causing mold and damage to the house. We had them installed in 2016. Waiting to hear what pella is going to do about the problem… after reading so many negative comments about their products I have a feeling this is going to turn into long process with them.

  8. We have the same issue. Bottom rail of the window sash rotted. Couldn’t tell a thing was wrong until opening the window and having the bottom literally fall apart! Now that I’ve been reading up on this failure and have learned what the subtle early signs of trouble are, several more windows look like they are possibly developing the same issue. Infuriating that Pella knows about this issue and gives it’s customers no warranty, no warning, and no advice on how to seal the windows so this doesn’t happen. They should be doing a recall – or an expanded and extended warranty to cover this – instead of writing their warranties explicitly to exclude such a devastating failure of their windows. It’s an appalling situation.

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