Quick answer: Specialty size beds are any bed sizes outside the six standards (Twin, Twin XL, Full, Queen, King and California King). They include oversized kings like the Alaskan King (108" × 108"), Texas King (80" × 98") and Wyoming King (84" × 84"), plus in-between sizes like the Olympic Queen (66" × 80"), Full XL (54" × 80"), Three Quarter (48" × 75") and RV sizes. Most need a custom-built bed frame.
Key takeaways
- There are two kinds of specialty size: oversized (bigger than a King) and in-between (non-standard widths or lengths).
- The mattress is rarely the hard part. The bed frame and bedding are what's difficult to find in specialty sizes.
- A made-to-order frame is built around your exact mattress measurement, not a nominal size.
- Before ordering, measure your room, doorways, stairs and elevator, not just the mattress.
What are specialty size beds?
A specialty size bed is any bed built for a mattress that isn't one of the six standard US sizes. These sizes exist for real reasons: families who co-sleep, very tall sleepers, couples with different firmness or adjustable-base needs, antique frames, guest rooms with awkward walls and RVs. Because few retailers stock them, most people end up needing a custom size bed frame built to order.
Specialty bed size chart
| Bed size | Dimensions (W × L) | Best for | Guide |
|---|---|---|---|
| Alaskan King | 108" × 108" | Co-sleeping families, the largest bedrooms | Alaskan King guide |
| Florida King | 108" × 80" | Extra-wide sleeping for families | Oversized kings compared |
| Texas King | 80" × 98" | Very tall sleepers | Texas King guide |
| Wyoming King | 84" × 84" | Couples wanting width and length | Wyoming King guide |
| California King | 72" × 84" | Tall sleepers in narrower rooms | California King guide |
| Split King | 2 × 38" × 80" (76" × 80") | Adjustable bases, different firmness | Split King guide |
| Split California King | 2 × 36" × 84" (72" × 84") | Tall couples with adjustable bases | Split Cal King guide |
| Olympic Queen | 66" × 80" | Couples who want more than a Queen | Olympic Queen guide |
| Full XL | 54" × 80" | Tall single sleepers, small rooms | Full XL guide |
| Twin XL | 38" × 80" | Tall teens, guest rooms, split kings | Twin XL guide |
| Three Quarter | 48" × 75" | Antique frames, narrow rooms | Three Quarter guide |
| RV Short Queen | 60" × 74"–75" | Campers, RVs, compact rooms | RV bed sizes guide |
| RV King | 72" × 80" (some 72" × 75") | RV master bedrooms | RV bed sizes guide |
Mattress makers vary by up to an inch or two, so treat these as nominal sizes. Always measure the actual mattress before you order a frame.
What is the biggest bed size you can buy?
The Alaskan King, at 108" × 108" (9 feet square), is the largest common bed size. It's followed by the Florida King (108" × 80") for width and the Texas King (80" × 98") for length. See our oversized king bed comparison to choose between them.
What are the in-between bed sizes?
Some specialty sizes solve a narrower problem than "more space":
- Olympic Queen adds 6" of width to a Queen without the footprint of a King.
- Full XL and Twin XL add 5" of length for taller sleepers.
- Three Quarter sits between a Twin and a Full and is common in antique and vintage beds.
- Split King and Split California King use two mattresses so each side can move or feel different.
- RV Short Queen and RV King are shorter or narrower to fit vehicles and compact rooms.
What are custom bed frame sizes?
Custom bed frame sizes are frames built to a specific mattress measurement rather than picked from a fixed list. A well-made custom frame adds a small allowance around the mattress so it sits snugly without binding. It also lets you choose the overall footprint, headboard height and rail style to fit your room. At Candace & Basil, frames are offered from Twin through Alaskan King, and we build to your own measurements if your size isn't listed.
How do I choose a specialty bed size?
- Start with sleepers. How many people (and pets) share the bed, and how tall is the tallest? Add at least 6" to the tallest sleeper's height for length.
- Measure the room. Leave roughly 24" to 36" of walkway on each side and at the foot of the bed.
- Measure the route in. Doorways, stair turns and elevators decide what can be delivered. Large frames can be built to assemble in sections.
- Check bedding. Specialty sizes often need made-to-order sheets and duvets, so plan for them.
- Measure the mattress you'll actually use. Build the frame around it, not around a size name.
Why are specialty size bed frames hard to find?
Mass-market furniture is designed once and produced in volume for the most common sizes, so low-volume sizes rarely get made. A made-to-order workshop doesn't have that limit. You can read more about the process in our guide to made to order bed frames.
How Candace & Basil builds specialty size beds
Every Candace & Basil bed frame is bench-made in-house from solid maple hardwood — no particleboard or MDF — and built only after you order it. You choose the size, the headboard height (42", 52", 62" or 72"), the fabric and the finish, and we ship across the contiguous USA from our Miami showroom. If your size isn't listed on a product page, we build to your exact measurements.
Shop by size: Alaskan King · Texas King · Florida King · Alberta King (96" × 96") · California King · Twin XL · Olympic Queen · Full XL · Wyoming King · Split King · Split California King · Any custom size · Double/Full.
Frequently asked questions
What is considered a specialty size bed?
Any bed size outside Twin, Twin XL, Full, Queen, King and California King, including Alaskan, Texas, Wyoming and Florida King, Split King, Olympic Queen, Full XL, Three Quarter and RV sizes.
What is the largest bed size?
The Alaskan King, at 108 inches by 108 inches, is the largest common bed size.
Can I get a bed frame made in a custom size?
Yes. Candace & Basil builds bed frames from Twin to Alaskan King and can build to your own measurements if your size isn't listed.
Do specialty size beds need special bedding?
Usually, yes. Oversized and in-between sizes often need made-to-order fitted sheets and duvets, although some sizes can use deep-pocket or larger standard bedding. See our specialty size bedding and mattress guide.
How much room do I need for an oversized bed?
Allow the bed's footprint plus about 24 to 36 inches of walkway on each open side. An Alaskan King, for example, works best in a room at least 13 to 14 feet on each side.
Related reading: Mattress sizes explained · Oversized king beds compared · Made to order bed frames
Ready to build yours?
Browse our custom beds, request a custom quote, or call 1-800-961-1789. Visit us at 2334 NE 2nd Ave, Miami, FL 33137 (Mon–Fri 11am–6pm, Sat–Sun 11am–5pm).
