Converting Antique Double/Full Size Iron Beds to a Modern King Size: A Detailed Guide
Antique iron beds, often associated with the Victorian era, are not only iconic but also hold immense historical and sentimental value. These beds, particularly those manufactured in the 1800s, were designed for smaller mattress sizes, with double or full-size beds being the largest option available at the time. Fast forward to today, and our modern need for larger sleeping spaces often leads individuals to seek ways to convert these vintage treasures into king-sized beds.
In this post, we’ll explore the process of converting an antique double/full-size iron bed to a king size, taking you through each step of the conversion process, the craftsmanship involved, and the benefits of preserving the original structure of these magnificent pieces.

The Challenge of Modernizing Antique Iron Beds
Antique iron beds are much smaller than today’s standard sizes. While beds in the early 1800s were typically designed to accommodate a full or double-sized mattress (54 inches wide by 75 inches long), today’s standard king-size mattress is a generous 76 inches wide by 80 inches long. This size disparity poses a challenge for anyone looking to preserve the integrity of an antique bed frame while upgrading it to fit a modern king-size mattress.
For many, converting these antique beds into a king size is a way to keep a beloved piece of history alive while making it functional for modern use. The conversion process, however, is far from simple. It requires a skilled balance of restoration and modification to ensure that the original structure is preserved while accommodating the larger dimensions needed for a king-sized mattress.
Why Convert Antique Iron Beds?
Before diving into the conversion process, it’s worth considering why someone would want to convert an antique iron bed. There are several compelling reasons:
- Historical Value: Antique iron beds are often intricately designed and crafted, making them valuable heirlooms or collectibles. Converting them allows owners to maintain the beauty and history of the original bed while making it more practical for contemporary needs.
- Unique Design: Antique beds, especially those from the Victorian and early 20th century, often have beautiful detailing in the ironwork, including ornate headboards and footboards, castings, and brass or nickel-plated accents. These details are far rarer in modern beds.
- Sentimental Attachment: Many families pass down antique beds from generation to generation, and the sentimental value of these pieces can be irreplaceable. Converting the bed ensures its continued use and longevity.
- Sustainability: Restoring and repurposing antique furniture aligns with modern values of sustainability and eco-friendliness. Instead of discarding an old piece, you’re giving it new life and purpose.

The Conversion Process
Converting an antique double/full iron bed to a king-size requires both technical skill and artistic craftsmanship. It’s not simply a matter of expanding the frame and slapping on some new parts. The process must be done in a way that preserves the original character of the bed, while also making necessary adjustments to accommodate the larger size.
Selecting the Right Bed for Conversion
The first step is choosing the right antique bed from the available inventory. Since the conversion involves cutting and modifying the bed, it’s important to pick a bed with sturdy, high-quality materials and unique designs. Typically, beds made from solid wrought iron are preferable, as they have the durability to withstand the stresses of the conversion process.

Cutting the Bed and Adding New Tubing
The bed frame needs to be cut at strategic points, usually along the width of the headboard and footboard, in order to expand the frame to the necessary king-size width. The cuts are made at integral places where the structure of the bed will be least affected, and where the new sections can be seamlessly integrated.
Once the frame is cut, additional iron tubing is added to widen both the headboard and footboard. These extensions are carefully welded to ensure the structure remains strong and stable. The welding process is done meticulously to preserve the aesthetic integrity of the bed, so the seams are as discreet as possible.

Reinforcing the Bed Frame
Antique iron beds were often built to last, but expanding their width requires reinforcing the frame to ensure it can support the larger mattress size. New reinforcements, including vertical and horizontal rods, are added to enhance the frame’s durability. In the case of original beds with decorative vertical rods in the headboard or footboard, new rods are cast to match the originals.
Casting New Rods and Castings
One of the most delicate aspects of converting an antique bed to a king size is replicating the intricate details of the original ironwork. To achieve this, the original castings, whether decorative finials, vertical rods, or other accents, must be carefully duplicated.
At this stage, moulds of the original castings are made so that new pieces can be poured in a foundry. The process of casting involves melting iron and pouring it into a mould to create a replica piece. This ensures that any additional vertical rods or ornamental parts required for the conversion match the original design as closely as possible. By using traditional casting techniques, these new parts retain the same look, feel, and quality as the original components.
Finishing and Polishing
Once the structural changes are complete, the bed is prepared for finishing. Antique beds often feature elaborate decorative touches like brass accents or intricate paintwork, and it’s essential to preserve these finishes during the conversion process. If the bed was originally painted, it may require sanding, priming, and repainting to restore its original look. If the bed had brass or nickel-plated accents, these can be polished to restore their shine.
Finally, the entire bed is inspected to ensure that all components are secure, and the bed is properly reinforced for support. The final result is a bed that retains the charm of its antique origins while being sturdy and functional enough to accommodate a modern king-sized mattress.

Maintaining the Authenticity of the Bed
One of the key goals during the conversion process is maintaining the authenticity of the bed. Antique iron beds have a unique character, with every rusted bolt, patina, and engraving telling a story of the past. A good conversion process strives to preserve these details as much as possible, allowing the bed to function as a piece of history while meeting the needs of modern-day users.
While the frame is expanded and the necessary new components are added, the overall look and feel of the bed should remain true to its original design. The new pieces should blend seamlessly with the old, ensuring that the conversion is not easily noticeable to those who appreciate the bed’s history.
Benefits of Converting Antique Iron Beds to King Size
There are several advantages to converting antique beds to a king size, both practical and sentimental:
- Functional for Modern Living: A king-size bed is much more comfortable for many people, especially those who are used to having more space while sleeping. Converting an antique bed to a king size makes it usable in a modern home without sacrificing the beauty and charm of the original design.
- Preserving History: The process of converting an antique bed to a king size allows owners to keep a piece of history alive, providing future generations with the opportunity to enjoy it. Restoring and converting these beds is an excellent way to pass down heritage, ensuring these historical treasures are preserved for years to come.
- Increased Value: A well-executed conversion can actually increase the value of an antique bed. By preserving the original craftsmanship while upgrading it for modern use, the bed becomes a unique, one-of-a-kind piece that combines history with functionality.
- Personalized Design: The conversion process can allow owners to personalize the final product, whether through the addition of custom finishes, or by incorporating modern design elements that enhance the overall aesthetic of the bed.
Converting an antique double or full-size iron bed into a modern king-size bed is a labor of love, requiring a combination of technical expertise, artistic craftsmanship, and historical preservation. The process ensures that antique beds can still serve their functional purpose in today’s world while preserving their unique beauty and craftsmanship.
By taking the time to carefully expand the width of the headboard and footboard, replicate original castings, and reinforce the structure, owners can enjoy a bed that marries the best of both worlds: the timeless elegance of an antique with the comfort and size of a modern king bed. This transformation not only brings new life to old pieces but also allows families to enjoy the comfort of modern living without having to part with cherished family heirlooms.
Whether you’re restoring an antique iron bed for yourself or as a special gift for a loved one, the result will be a stunning and functional piece that tells a story, providing comfort and elegance for years to come.