Planning
Assessment and Measurement
Accurate measurement and thorough assessment are the foundation of successful storefront glass replacement. Errors at this stage cascade through the entire project -- wrong size glass, incorrect glass type, or missed frame damage results in delays, additional costs, and return trips.
Glass Panel Measurement
Measure the daylight opening (the visible glass area) and the full panel size (including the portion concealed within the frame channels). Measurements must be taken at multiple points because storefront frames are rarely perfectly square -- measure width at the top, middle, and bottom; measure height at the left, center, and right. Use the smallest measurement in each dimension to ensure the new glass fits. For insulated glass units, also measure the frame glazing pocket depth to confirm it accommodates the IGU thickness.
Frame Condition Assessment
Before ordering replacement glass, inspect the existing frame for: corrosion or oxidation that weakens the aluminum; bent or deformed frame members; damaged or missing glazing gaskets and setting blocks; loose anchors or fasteners at the building structure; cracked or separated frame corners; and water intrusion damage to the frame and surrounding wall. If the frame is damaged, replacing only the glass is a temporary fix -- the frame issues will cause the new glass to fail prematurely.
Glass Type Identification
Identify the existing glass type to determine the replacement specification. Look for: tempered glass marks (a small etched logo in the corner of the glass); laminated glass indicators (a slightly different edge appearance and the glass holds together when cracked); insulated glass (visible spacer bar between panes at the glass edge); and Low-E coatings (a subtle color difference when viewed at an angle). If the glass is broken, examine the breakage pattern -- tempered glass creates small, roughly cubic fragments; annealed glass breaks into large, sharp shards; laminated glass cracks but stays intact.
Site Conditions
Document site access conditions that affect the replacement logistics: distance from vehicle access to the storefront (glass panels are heavy and fragile); ground-level vs. elevated installation (scaffolding or lift requirements); sidewalk traffic and pedestrian safety considerations; business hours and customer traffic patterns; and any overhead obstructions (awnings, signage, power lines). These factors influence scheduling, labor requirements, and safety planning.
Glass Selection
Glass Type Selection
Choosing the right glass type balances safety requirements, energy performance, security needs, and budget. The glass selection directly affects building code compliance, energy costs, and the long-term durability of the installation.
Tempered Safety Glass
StandardHeat-treated glass that is 4-5 times stronger than annealed glass. When broken, tempered glass fractures into small, granular fragments rather than.
Ideal Applications
Standard storefront glazing, sidelights, transoms, and any glass in hazardous locations (adjacent to doors, within 18 inches of the floor). The most cost-effective option for single-pane replacement.
Key Considerations
Cannot be cut, drilled, or modified after tempering -- all fabrication must be completed before heat treatment. Lead time for custom sizes is typically 5-10 business days. Single-pane tempered glass provides no insulation value (R-0.9).
Insulated Glass Units (IGU)
Energy EfficientTwo panes of tempered glass separated by an aluminum or warm-edge spacer, sealed with structural sealant, and filled with argon gas.
Ideal Applications
Energy code compliance, conditioned commercial spaces, storefronts in new construction, and any storefront where energy performance is a priority.
Key Considerations
Heavier than single-pane glass (approximately double the weight per square foot). Requires deeper glazing pockets in the storefront frame. Fabrication lead time is 2-3 weeks for custom sizes. Seal failure over the unit lifetime (15-25 years) causes fogging between panes.
Laminated Safety Glass
SecurityTwo or more glass layers bonded with a tough PVB (polyvinyl butyral) or SGP (SentryGlas Plus) interlayer.
Ideal Applications
Ground-floor storefronts in high-crime areas, government buildings, jewelry stores, pharmacies, and any storefront where security against break-in is a concern. Also used where both safety glazing and UV protection are needed.
Key Considerations
More expensive than tempered glass (approximately 50-100% premium). Slightly reduced visible light transmission compared to clear tempered glass. Thicker configurations are significantly heavier.
Spandrel Glass
ConcealmentOpaque glass panels used to conceal floor slabs, structural members, insulation, and mechanical equipment behind the storefront facade.
Ideal Applications
Areas above or below the vision glass where the building structure needs to be concealed, column covers, and areas where a continuous glass facade is desired but transparency is not.
Key Considerations
Color matching between spandrel and vision glass requires careful specification. Spandrel glass absorbs significantly more solar heat than clear glass, creating thermal stress that can cause breakage if the glass is not properly heat-treated. Insulation must be placed behind spandrel glass with an air gap to prevent heat buildup.
Energy Codes
Energy Code Compliance (IECC Zone 4A)
The DC, Virginia, and Maryland area falls within IECC Climate Zone 4A. Commercial storefront glass replacement projects must comply with energy code requirements that specify maximum U-factor and solar heat gain coefficient (SHGC) values. Understanding these requirements prevents costly non-compliance issues.
| Requirement | IECC Zone 4A Value | What It Means |
|---|---|---|
| U-Factor (fixed windows) | 0.38 max | Requires insulated glass; single-pane glass (U=1.11) does not comply |
| U-Factor (operable windows) | 0.40 max | Insulated glass in operable storefront windows and doors |
| SHGC (all orientations) | 0.25-0.40 | Low-E coating required to control solar heat gain |
| Air Leakage | 0.30 CFM/ft max | Proper weatherstripping and gaskets on operable units |
| Window-to-Wall Ratio | 30-40% max | Total glass area as a percentage of gross wall area |
Expert Tip: Like-for-Like vs. Upgrade Triggers
In most DMV jurisdictions, replacing a broken glass panel with the same type and size (like-for-like) is considered repair and may not trigger current energy code compliance. However, if you replace more than 25% of the total storefront glass area, change the glass type, or alter the frame system, current energy code requirements typically apply to the entire project. This is a critical distinction that affects both glass specification and project cost.
Accessibility
ADA Requirements for Storefronts
The Americans with Disabilities Act affects storefront glass replacement when the project involves doors, sidelights, or the entrance configuration. Even a simple glass replacement can trigger ADA scrutiny if the work modifies the accessible path of travel.
Door Clear Opening Width
Storefront entrance doors must provide a minimum 32-inch clear opening width when open 90 degrees. A standard 36-inch door typically provides a 34-inch clear opening. When replacing a storefront door and frame, verify the clear opening meets the 32-inch minimum. Narrow-stile aluminum doors may not achieve 32 inches if the stile width is too large.
Visibility Markings
Full-height glass panels, sidelights, and glass doors must include visual indicators (etched bands, applied decals, or logos) between 30 and 36 inches above the floor. These markings make the glass visible to people with low vision and prevent walk-into accidents. When replacing clear glass panels adjacent to doors, ensure visibility markings are included on the new glass or applied after installation.
Bottom Rail Height
Glass doors must have a smooth surface on the push side within 10 inches of the floor. The storefront door bottom rail satisfies this requirement. When replacing a door, verify the bottom rail height is at least 10 inches and provides a smooth, unobstructed surface for wheelchair footrests.
Hardware Accessibility
When storefront glass replacement includes door hardware, all handles, locks, and closers must be operable with one hand without tight grasping, pinching, or twisting. Lever handles, push/pull bars, and panic hardware meet this requirement. Round knobs do not comply. Door closers must not require more than 5 pounds of force for interior doors.
Maneuvering Clearance
Adequate floor space must exist on both sides of the storefront entrance for wheelchair approach and maneuvering. If the storefront replacement changes the door swing direction or location, verify the maneuvering clearances meet ADA requirements. This is particularly important for corner entries and recessed storefronts where the approach geometry changes.
Permits
Permit Requirements in the DMV
Permit requirements for storefront glass replacement vary by jurisdiction and the scope of work. Understanding when a permit is required -- and when it is not -- prevents delays and compliance issues.
Generally No Permit Required
Like-for-like glass replacement within an existing frame (same size, same type). Replacing a broken tempered glass panel with a new tempered glass panel. Reglazing (replacing gaskets, sealant, or setting blocks). Minor hardware replacement (handles, closers, weatherstripping). These are considered maintenance and repair in most DMV jurisdictions.
Permit Typically Required
Replacing the entire storefront frame system. Changing the opening size or configuration. Converting single-pane to insulated glass when the frame must change. Adding or modifying doors in the storefront. Any structural modifications to the wall or header above the storefront. Any work that affects the means of egress or fire-rated assemblies.
DC (DCRA) Specifics
The DC Department of Consumer and Regulatory Affairs requires permits for storefront alterations that change the appearance, configuration, or structural elements. Historic districts (Georgetown, Dupont Circle, Capitol Hill) require Historic Preservation Office (HPO) review for any exterior changes to the storefront, including glass type changes. Processing time is typically 2-4 weeks for standard permits.
Virginia & Maryland Specifics
Virginia jurisdictions (Arlington, Fairfax, Alexandria) follow the Virginia Uniform Statewide Building Code. Maryland jurisdictions (Montgomery County, Prince George County, Bethesda) follow the Maryland Building Performance Standards. Both states require permits for storefront modifications beyond simple glass replacement. Processing time varies from 1 week (simple) to 6 weeks (complex with plan review).
Process
The Replacement Process Step by Step
A well-managed storefront glass replacement follows a systematic process that minimizes business disruption and ensures quality results. Each step builds on the previous one.
Initial Assessment & Emergency Securing
If the glass is broken, the first priority is securing the opening. This typically involves board-up with plywood or temporary polycarbonate panels. The assessor documents the damage, measures the opening, identifies the frame system, and evaluates the frame condition. Photographs document the existing condition for insurance claims if applicable.
Glass Specification & Ordering
Based on the assessment, the glass type, size, thickness, and any coatings or treatments are specified. The specification must satisfy safety glazing requirements, energy code (if applicable), and any security or acoustic requirements. The glass is ordered from the fabricator with the specified parameters. Lead time depends on glass type: stock clear tempered is typically 3-5 days; custom IGUs with Low-E coatings are 2-3 weeks.
Frame Preparation
On installation day, the old glass (or temporary board) is removed and the frame is prepared. Old gaskets, sealant, and setting blocks are removed. The frame channels are cleaned and inspected. Any frame damage is repaired. New setting blocks (neoprene or EPDM pads that support the glass weight at the bottom of the frame) are positioned at the quarter-points of the panel width.
Glass Installation
The new glass panel is lifted into position using suction cups and carefully set onto the setting blocks. The panel is centered in the frame with proper edge clearance (typically 1/4 inch minimum on all sides). Glazing gaskets or wedge gaskets are installed around the perimeter to secure the glass and seal against air and water infiltration. For wet-glazed installations, structural silicone sealant is applied.
Hardware & Finishing
Door hardware (handles, closers, locks, panic devices) is installed or reinstalled. Weatherstripping is replaced. Any visibility markings, decals, or signage are applied. The frame exterior is sealed against the building wall with compatible caulk. Interior trim or covers are reinstalled.
Quality Verification
The completed installation is inspected for: proper glass centering and edge clearance, complete gasket coverage with no gaps, smooth door operation and proper latching, intact weatherstripping with no daylight visible, safety glazing labels visible and legible, and clean glass and frame surfaces. If a permit was required, the installation is ready for building inspection.
Timeline
Timeline Planning and Business Continuity
Storefront glass replacement timelines range from same-day emergency service to multi-week planned projects. Understanding the timeline factors helps you plan for minimal business disruption.
| Scenario | Typical Timeline | Key Factors |
|---|---|---|
| Emergency board-up | 1-4 hours | Available 24/7; temporary securing of the opening |
| Stock-size tempered glass | 1-3 days | Common sizes in inventory; standard clear tempered |
| Custom-size tempered glass | 5-10 business days | Fabrication lead time; standard coatings and treatments |
| Custom IGU (insulated) | 2-3 weeks | Dual-pane fabrication; Low-E coating application; quality testing |
| Laminated security glass | 2-4 weeks | Lamination process; custom interlayer specifications |
| Complete system replacement | 3-6 weeks | Frame fabrication, permit processing, multi-phase installation |
Expert Tip: Business Continuity Planning
For planned storefront replacement (not emergency), schedule the installation during off-peak hours -- early morning, evening, or weekends -- to minimize disruption to customers and foot traffic. For multi-panel replacements, we can phase the work over several visits so that only one section is open at a time. Temporary polycarbonate panels maintain security and weather protection during the period between old glass removal and new glass installation.
Common Questions
Frequently Asked Questions
How long does storefront glass replacement take?
For standard single-pane tempered glass replacement with an existing frame in good condition, same-day or next-day service is typical for stock sizes. Custom-sized insulated glass units (IGUs) require 1-3 weeks for fabrication. A complete storefront system replacement (glass, frame, and hardware) takes 3-6 weeks from measurement to completion, including fabrication lead time. Emergency board-up and temporary glazing can be done within hours to secure the opening until permanent glass arrives.
Does storefront glass replacement require a permit?
In most DMV jurisdictions, replacing glass within an existing frame (like-for-like replacement) does not require a building permit. However, if the replacement involves changing the frame system, altering the opening size, upgrading to a different glass type that affects structural loads, or modifying the storefront configuration, a permit is typically required. Energy code compliance may also trigger permit requirements if the new glass must meet updated energy standards. Always verify with your local building department -- requirements vary between DC, Arlington, Fairfax, Montgomery County, and other DMV jurisdictions.
What type of glass is required in storefronts?
All storefront glass must be safety glazing per the International Building Code (IBC) and CPSC 16 CFR 1201. Tempered glass is the most common choice -- it is 4-5 times stronger than annealed glass and breaks into small, relatively harmless fragments. Laminated glass is required or recommended where security, sound reduction, or impact resistance is needed. In areas subject to human impact (within 18 inches of the floor in panels larger than 9 square feet), safety glazing is mandatory. Energy codes increasingly require insulated glass units (IGUs) with Low-E coatings for new installations.
Can I upgrade from single-pane to insulated glass in my existing storefront frame?
It depends on the frame system. Standard aluminum storefront frames have a glazing pocket depth of 1 inch, which accommodates single-pane glass (1/4 inch) with glazing tape and wedge gaskets, but not a standard IGU (which is typically 1 inch thick overall). Some frames accept a narrow-profile IGU (5/8 inch or 3/4 inch overall) designed for retrofit applications. If the existing frame cannot accept insulated glass, the frame must be replaced with a deeper-pocket system. A site assessment determines which approach is feasible for your specific storefront.
How do I know if my storefront glass needs replacement vs. repair?
Replace the glass if: there is a crack or chip that extends more than 6 inches or reaches the glass edge; the sealed IGU has failed (fog or condensation between panes); the glass has significant scratches that impair visibility or appearance; the glass does not meet current safety glazing requirements; or energy performance is unacceptable (single-pane in a conditioned space). Repair may be adequate for: small chips (under 1 inch) away from the glass edge; minor scratches that can be polished; loose glazing gaskets that can be replaced; and hardware issues (latches, handles) that do not involve the glass itself.
What is the difference between storefront and curtain wall glass systems?
Storefront systems are non-structural glass and aluminum assemblies that span between floors -- they sit within and are supported by the building structure at each floor level. Typical maximum height is 10-12 feet per section. Curtain wall systems are exterior cladding that hangs from the building structure and spans multiple floors -- the glass wall is suspended in front of the floor slabs. Curtain walls handle wind loads, thermal movement, and seismic drift differently than storefronts. Most ground-level commercial glazing in the DMV is storefront; mid-rise and high-rise buildings use curtain wall.
By the Expert Glass Repair Team
Serving the DMV since 2004 -- DC, Northern Virginia & Maryland
Expert Glass Repair replaces storefront glass for commercial properties throughout Washington DC, Northern Virginia, and Maryland. From single-panel emergency replacements to complete storefront system upgrades, our team handles every aspect of commercial glazing with full code compliance. Fully Insured.
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