Single-Cylinder vs. Double-Cylinder Deadbolt Installation: Choosing the Right Fit for Your LA Home
The single-cylinder deadbolt is the most common choice for Los Angeles residential entry doors. It uses a keyed cylinder on the exterior and a thumb-turn on the interior, making it straightforward to exit quickly — an important consideration given California's fire safety guidance for occupied dwellings. A double-cylinder deadbolt, by contrast, requires a key on both sides, which adds a layer of protection on doors with glass panels or sidelights where a burglar could otherwise reach through broken glass and simply flip the thumb-turn. We see this configuration frequently on older homes in neighborhoods like Los Feliz and Hancock Park, where decorative door glass is part of the original architecture. Our technicians walk you through the trade-offs — egress safety versus break-in resistance — so the final decision is always yours and always informed.
Beyond the cylinder type, the grade of the lock body matters enormously. ANSI Grade 1 locks withstand significantly more kick and pry force than Grade 2 or Grade 3 hardware. For a front door on a busy street, or a rental unit where you can't control who previously had a key, upgrading to a Grade 1 deadbolt during your deadbolt installation appointment is one of the highest-value security moves you can make. Our mobile units carry a curated inventory of Grade 1 hardware so we can complete most jobs in a single visit without back-ordering parts.

