New windows leaking after installation: Window Install Check

A startup idea for people asking “Leaky windows after installation” on Reddit

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Opportunity brief

Signal: 2/10
Model: Service · Difficulty: Low
Updated: Oct 26, 2026
By: PainPoint Daily Team · How we score

Evidence from Reddit

Reddit threads: 1
Days seen: 1
Peak rank: #43

“Sorry trying to figure out how to include the photo haha”u/Beastloukas on r/HomeImprovement

“There’s quite a draft coming through and also outside noise can be heard as if the window was cracked open. Is this something the installer can fix or will new windows need to be made?”u/Beastloukas on r/HomeImprovement

First seen on Reddit Oct 23, 2026 · Last seen Oct 23, 2026

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Opportunity brief

A homeowner who had new windows installed found a draft and outside noise coming through a gap at the seal on the same day, and didn't know whether it was a fixable installer issue or a defective window.

Window Install Check is a short post-installation checklist that helps homeowners spot problems in the first days and send the installer a clear, documented request.

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Build a simple web app called Window Install Check: a homeowner checklist and photo guide for new window installations: what correct flashing and sealing look like, how to test for leaks, and how to document problems for a warranty claim.
The main user is homeowners who have just had replacement windows installed, people who keep asking things like "Leaky windows after installation".
Start with the smallest useful version: An illustrated checklist covering flashing.
Add a short landing page that explains the problem, plus a pricing section based on this plan: paid checklist and photo guide; paid remote review of photos by an experienced installer.
Keep the design clean and mobile-friendly, and don't add login until the core flow works.

(Idea from PainPoint Daily: https://painpointdaily.com/idea/window-install-check-new-windows-leaking/?ref=prompt)

The problem in people's words

The thread was posted to r/HomeImprovement on October 23, 2026 and ranked #43 that day.

“There’s quite a draft coming through and also outside noise can be heard as if the window was cracked open. Is this something the installer can fix or will new windows need to be made?”— u/Beastloukas on r/HomeImprovement, Oct 23, 2026

“I'd take a few clear photos of the gap now, with something like a business card in it for scale, and send them to the installer in writing today while it's fresh. Most window companies have a workmanship warranty that covers this.”— u/Pitiful-Scheme94 on r/HomeImprovement, Oct 23, 2026

“Installers can usually adjust the sash or re-shim the frame to close that gap up, sometimes the rubber seal just isn't seated properly”— u/AlienatedLineup on r/HomeImprovement, Oct 23, 2026

Both substantive replies said it was likely an adjustment or shimming issue, not a bad window, and to call the installer back quickly. The poster struggled to attach a photo until a commenter suggested Imgur, then shared pictures of each corner, and replied: “Thought it might have been a defect with the window!”

Seen in 1 Reddit post across 1 subreddit, on 1 day between Oct 23, 2026 and Oct 23, 2026, best daily rank #43.

Who has it

Homeowners in the first days after a window replacement, who notice drafts, noise or gaps and don't know what is normal or who is responsible.

The thread is short, with two substantive replies, so the size of this need is unproven.

Existing options

Option	Price	What it does
Andersen Windows warranty	Included with products	Manufacturer warranty documents, including the transferable Owner-to-Owner limited warranty; claims follow each product's warranty document. It covers the product, not necessarily the installer's workmanship.
ASHI Find an Inspector	Free directory; inspectors charge their own fees	Directory of home inspectors, for homeowners who want an independent opinion.

Names and prices checked on each provider's own site on Oct 26, 2026.

Manufacturer warranties and inspector directories exist, but nothing walks a homeowner through checking new windows on day one and writing a dated, photo-backed request to the installer.

The idea: what to build first

A mobile checklist for each new window: open and close it, check the seal all round, feel for drafts, listen for noise, and photograph each corner with a card in the gap for scale. Problems are marked on a simple diagram.

The tool produces a short, dated message to the installer with the photos and a request to adjust or re-shim, and stores the installer's workmanship warranty and the manufacturer's warranty documents together.

How it makes money

Our pricing guess: free for homeowners, possibly paid by installers who want to offer it as a handover checklist. Homeowners use this once per project, which makes a direct consumer charge hard.

The source thread contains no statement that someone would pay for this.

Validate it in a weekend

Publish the checklist as a free page and track completions and message downloads.
Ask a few window installers whether they would hand it to customers at the end of a job.
Collect whether users' issues were fixed after sending the message.

Risks

Evidence is one short thread with two substantive replies.
Diagnosing installation faults from photos is limited; the tool must not claim to diagnose.
One-time use per project makes retention low.
Installers may not want a tool that documents their faults.

Score breakdown

Opportunity 5/10 how we score

Demand 30%3.6/10
Pain & willingness to pay 25%5/10
Buildable with AI/no-code 25%9/10
Easy first customers 10%3/10
Room in the market 10%5/10

A bad install is costly and a checklist is easy, but buyers are hard to find at the right time, with limited demand so far. Signal score 2/10, calculated from thread count, days seen and best rank. Neither score is a forecast; see our methodology.

FAQ

Is a gap in a new window seal fixable by the installer?

Both detailed replies in the source thread said a gap right after installation is usually an adjustment, shimming or squaring issue, or a seal that isn't seated properly, rather than a bad window, and that the installer should come back to fix it.

What should I do if my new windows are drafty?

A commenter recommended taking clear photos of the gap with a business card in it for scale and sending them to the installer in writing the same day, noting that most window companies have a workmanship warranty.

Does a window manufacturer's warranty cover installation problems?

It depends on the warranty document. Andersen, for example, says claims follow each product's warranty document; installer workmanship is often covered separately by the installer.

Sources and last updated

Brief written from stored Reddit thread text by the PainPoint Daily Team. Last updated Oct 26, 2026.

Competitor pages checked:

The original threads (opens Reddit):

r/HomeImprovement: Leaky windows after installation Oct 23, 2026

Appeared in the daily list: Oct 23, 2026 (#43).

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