Replacement Windows, Doors, Shutters & Shades in Simi Valley, CA — Window Design Group

Simi Valley · Simi Valley

Windows, doors and shutters for Simi Valley homes — across three generations and fifty combined years.

From the ranch homes off Madera to the newer builds across the city, we install replacement windows, exterior doors, plantation shutters and custom shades by hand — same family every visit.

50 yr
Combined Experience
10x
Energy Performance
★ 4.8+
Customer Reviews
2
Generations
Window install in a Simi Valley home
A Simi Valley install — Norman USA Woodlore composite shutters built for the heat.
Premium brands we install in Simi Valley
Milgard AMI Norman USA
What We Install in Simi Valley

Built for the way Southern California homes actually live — the inland heat that lingers into the evening.

Milgard · AMI

Replacement Windows

Vinyl, wood and aluminum-clad windows from Milgard and AMI. Insulated E-glass for the inland heat that lingers into the evening. Two-window minimum.

Hand-Picked

Exterior Doors

Entry doors, French doors and patio sliders for Simi Valley homes. Fiberglass, wood, and steel — installed by our family team.

Norman USA

Plantation Shutters

Real hardwood and engineered composite shutters with mortise-and-tenon joinery — built for Simi Valley exposure and finished in your light.

Norman USA

Custom Shades & Blinds

Motorized roller shades, Roman shades, woven wood and bi-fold systems — sized for the wide-aperture windows common in Simi Valley homes.

Why Simi Valley Homeowners Choose Us

Same family. Same install crew. Every Simi Valley job our name on it.

01

We Know Simi Valley

Three generations installing across Ventura County. We know which jamb depths matter, which exposures need premium UV glass, and which HOAs to navigate.

02

Family Crew. Not Subs.

The person who measures your window is on the install crew. No handoffs between sales and crew. No mystery quotes.

03

Long-Standing Brand Partnerships

Decades-long relationships with Milgard, AMI and Norman USA mean better pricing and faster lead times than a contractor going to a generic supplier.

"They quoted us, installed the windows and shutters the next month, came back six months later to check everything. I have recommended them to four neighbors since."
Sarah K. · Westlake Village · 2024
Start your Simi Valley project

A real number. A real visit. We know Simi Valley.

Tell us how to reach you. The family team will call to schedule a free in-home consultation in Simi Valley — usually within the same business day.

Ready when you are

Bring us into your home. We will bring fifty years of craft.

One visit. Real measurements. Real numbers — for windows, doors, shutters or shades. No pressure to decide that day.