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Alside® Replacement Windows

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Free Estimates and Consultations Available

Having a wide range of replacement window styles; from single- and double-hung, sliding, fixed lite, casement and awning, bay, bow and garden varieties- as well as patio doors; Alside® is a window company that realizes your vision does not have any limits. Without diminishing performance or attractiveness, our unlimited selection of products are built to bring your vision to reality. While you've got Harris installing new windows, it is the ideal time to look into upgrading your siding as well as your entry doors to update your home.

Sheffield Windows

Alside Sheffield Windows

The superior performance of Sheffield® windows begins with innovation. Each and every precision-engineered part plays a part in exceptional energy savings. The multi-chamber design and style helps trap dead air to create a highly effective insulation barrier, while extra-thick, fusion-welded frames and sashes offer outstanding structural strength and make a long-lasting barrier against air and moisture infiltration, adding up to better energy savings - and lower power bills.

Sheffield windows come with a sloped sill helping to prevent air and water infiltration while keeping a timeless, detailed appearance. Beveled mainframes on double-hung and sliding home windows complement any home design. Best yet, Sheffield windows are handled by Alside's remarkable Lifetime Limited Warranty* for complete peace-of-mind.


  • Quad 4 weatherstripping at the header
  • Triple-barrier weatherstripping between sash and jamb
  • Sloped sill ensures quick water drainage
  • Compression bulb seal at the sill for further weather protection
  • Hidden screen track produces clean lines
  • Fully extruded lift rails for strength and durability
Sheffield Windows
Sheffield Windows
Sheffield Windows

Mezzo Windows

Alside Mezzo Windows

Mezzo Windows from Alside are a thermally optimized narrow-line frame and sash with a dual-pane insulated glass solution specially-engineered to meet stringent 2015 ENERGY STAR® requirements. The gorgeous narrow-line construction guarantees maximum daylight visibility while advanced technological reinforcements deliver superior strength while minimizing energy transfer.

You'll sleep easy at night knowing that Mezzo's enhanced forced-entry hardware and modernized screen and bulb design provide superior protection against bug infestations and other unwanted intrusions.

Tough, durable and weather-tight, with the custom beauty you've come to expect from this window company, the Mezzo Window is in a class by itself – a reasonably-priced window with performance power above and beyond the rest.


  • Low-profile frame and sash creates an expanded glass area while internal chambers increase structural integrity, rigidity and energy efficiency
  • HP3 telescoping sill dam delivers protection from air and water infiltration, increases structural stability and enhances beauty
  • Gatekeeper interlocking sash-to-sill technology delivers a unified wall of strength
  • The Ocular screen bulb seal eliminates light penetration between the screen and frame and aids in easy screen installation and removal
Barrington Area Chamber of Commerce
Association of Condominium, Townhouse, and Homeowners Associations
Member of Community Associations Institute
National Association of the Remodeling Industry
Certified Vinyl Installer of Vinyl Siding Institute
Certified Vinyl Installer of Vinyl Siding Institute
EPA Lead Safe Certified Firm
Wounded Warrior Project
Average rating for HARRIS ROOFING, SIDING, WINDOWS & DOORS is 4.93 stars of 5 stars - based on 80 reviews
Replacement Windows in River Forest, IL
I was very pleased with the replacement window project for my home.
Gary S. - River Forest, IL 60305