How to Enlarge a Window Opening in a Solid Brick Wall Safely
- Support Team
- May 21
- 5 min read
While Orange County is famous for its coastal stucco and modern wood-frame construction, older neighborhoods (like Old Towne Orange, historic Santa Ana, and custom estates) often feature solid brick or masonry construction.
Adding natural light to a masonry home is stunning, but enlarging an opening in brick is an entirely different beast than cutting into wood. In a solid brick house, the wall itself is the structure. Remove the wrong bricks without the right support, and you risk a catastrophic, "zipper-like" collapse of the masonry above.
Here is the technical guide to how a standard window is safely converted into an expansive, light-filled opening in a solid brick wall.
Quick Answer: Enlarging a window in a solid brick wall is a major structural modification. It requires installing temporary shoring (such as needle beams) to hold up the masonry above, cutting the brick with a specialized masonry saw, and installing a properly sized steel lintel to carry the weight of the wall over the new, wider span. Due to the high risk of structural collapse and masonry cracking, this is highly recommended as a professional-only project.
1. The Pre-Project Assessment: Solid Brick vs. Brick Veneer
Before any demolition begins, you must determine what kind of brick wall you are dealing with.
Brick Veneer: The house is actually built of wood framing, and a single layer of brick sits on the outside for cosmetic purposes. The wood frame holds the roof up; the brick just holds itself up.
Solid Masonry (Double Wythe): The house has two or more layers (wythes) of brick tied together. There is no wood framing. The brick itself carries the entire weight of the roof and floors above.
Enlarging a solid masonry wall is significantly more complex because you are dealing with immense, crushing "dead loads." For standard practices on masonry load management, professionals rely on guidelines from the Brick Industry Association (BIA).
2. The Structural Key: The Steel Lintel
In a wood-frame house, the weight over a window is carried by a wooden header. In a brick house, that weight is carried by a lintel - typically a heavy piece of angled steel (L-bracket) or an I-beam.
When you widen a window, the old lintel is now too short. You must install a new, longer, and thicker steel lintel to span the wider opening.
The Bearing Rule: A steel lintel cannot just cover the opening; it must rest on solid, uncut brick on either side of the window. Typically, a lintel must extend at least 4 to 6 inches into the masonry on both the left and right sides to safely transfer the load down to the foundation.
3. The Step-by-Step Structural Process
Step 1: Temporary Shoring (Needle Beams)
You cannot simply pull the old lintel out and put a new one in; the bricks above will immediately fall. To prevent this, professionals use a technique called "needling." Holes are drilled through the brick wall just above where the new lintel will go. Heavy steel or wooden beams (needles) are passed through these holes and supported by heavy-duty adjustable steel props (shoring jacks) on both the inside and outside of the house. This holds the roof and upper brickwork suspended in place.
Step 2: Cutting the Masonry
With the wall safely supported, the demolition begins.
The Tools: A high-powered, water-fed diamond masonry saw is used to cut clean vertical lines for the new opening.
Safety First: Cutting brick generates massive amounts of crystalline silica dust. Proper wet-cutting methods and industrial HEPA extraction are required to meet OSHA Respirable Crystalline Silica Standards and keep the interior of your home safe.
Step 3: Installing the New Lintel and Mortar
Once the wider opening is cut, the new steel lintel is maneuvered into place and set onto a bed of fresh, high-strength mortar. The masonry above the lintel is then carefully rebuilt and "toothed" back in to ensure a seamless structural bond.
Step 4: Waterproofing the Masonry
Brick is naturally porous; it acts like a hard sponge. If water gets behind the window frame, it cannot easily escape. A custom stainless steel or heavy-duty vinyl through-wall flashing must be installed above the lintel, complete with "weep holes" to allow trapped moisture to exit the wall cavity.
Why Brick Alterations Are Not a DIY Project
The margin for error in masonry modification is practically zero. Here is why attempting this without professional structural experience usually ends in disaster:
The "V-Shape" Collapse: Bricks interlock. If a lintel is removed without proper shoring, the wall doesn't just sag - a V-shaped section of masonry extending all the way to the roofline will crack, drop, and potentially collapse.
Improper Lintel Sizing: Steel flexes under extreme weight. If a DIYer uses a standard piece of angled steel from a hardware store for a 6-foot sliding door span, the steel will bow over time, crushing the expensive new window beneath it.
Permitting and Seismic Codes: Modifying structural masonry requires a building permit. In high-seismic zones like Southern California, the California Building Code (CBC) provisions for masonry dictate that the new opening may require specialized steel framing or reinforced concrete to ensure the brick wall won't shear during an earthquake.
The Bottom Line
Bringing expansive glass into a classic brick home creates a beautiful architectural contrast, but the structural stakes couldn't be higher. The most expensive window installation is the one that requires a masonry rebuild to fix.
Protect your home’s architectural integrity and structural safety. If you are ready to upgrade your view, the professional team at XP Windows and Doors works with structural experts to ensure the job is executed flawlessly, to code, and built to last.
Contact us today for a free consultation.
Frequently Asked Questions (FAQ)
Can I make a window bigger in a brick house?
Yes. You can enlarge a window in a solid brick house, but it requires removing the masonry around the opening, temporarily shoring the wall, and installing a new, properly engineered steel lintel to support the wider span of bricks.
Do I need a permit to enlarge a window in a brick wall?
Absolutely. Enlarging an opening in load-bearing masonry alters the structural integrity of the home. A permit and often a sign-off from a structural engineer are required to ensure the modification meets local building and seismic codes.
What is a lintel in brick construction?
A lintel is a structural horizontal support, usually made of angled steel, installed above windows and doors in masonry walls. It carries the immense weight of the bricks and roof above, transferring that load safely to the intact wall sections on either side of the opening.
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