Welcome to Door Theory
Factory-direct doors & windows · Made to order
Premium doors &
windows, factory
direct
"NO CRAZY MARKUPS"
Made to
Order
Every Product
40–60%
Average Savings
Factory
Direct
No Steep Markups
A Word From Us
Welcome to
Door Theory
Family owned and operated. See how our factory-direct process delivers precision-engineered doors and windows — without the steep markups.
Style & quality
within budget
05 — Materials
The industry standard for modern fenestration. Aluminum offers the best strength-to-weight ratio, is inherently rust-resistant, and can be powder-coated in any RAL color.
Our Story
Built from
frustration
Coming from a family of contractors, founder Aaron Thornton built Door Theory after facing the same problem repeatedly — high-quality doors and windows that destroyed project budgets.
Get in Touch →"My biggest satisfaction is when I can save working people thousands on their budget."
Aaron Thornton, Founder
Client Reviews
What Our
Clients Say
"Door Theory saved us over $40,000 on our full window and door package. The quality is indistinguishable from the luxury brands — and the lead time was half what we expected."
James & Carla M.
Brentwood Custom Home · Los Angeles, CA
01
Instant Price Estimator
See how we
compare
Product Type
Material
Glazing
Live Summary
to see your estimate
* Indicative range. Final pricing depends on finish, hardware, and installation scope.
Get a Formal QuoteGeographic Reach
Installations Across
North America
32+
Projects
12
States
Click any marker to see project details
Start Your Project →Florida DBPR
Licensed & Regulated
Miami-Dade
Approved Products
NFRC
Certified Performance
AGWA
Industry Member
Common Questions
Everything You Need
to Know
Quick answers about lead times, shipping, installation, and warranties.
