Custom Size Mattress, Built-In Bed, Window Seat and Reading Nook Canada

Reading Time: 6 minutes

Built-In Bed Mattress Selection

Built-in beds, sometimes called platform beds, Murphy beds, or alcove beds, are becoming more common in Canadian homes as living spaces become more intentionally designed. New build condominiums, coach houses, and small urban homes in Ontario frequently incorporate built-in sleeping spaces as part of their design. Older homes, particularly craftsman and heritage properties, often have alcove sleeping spaces or built-in bunk configurations that require careful mattress sizing.

The key considerations for a built-in bed mattress:

• Clearance height: Built-in beds, particularly upper bunks and alcove beds, often have limited clearance above the sleeping surface. The mattress height is a direct constraint. Most standard coil mattresses range from 25 to 35 cm in height; low-profile mattresses (15 to 20 cm) are available for tight clearance situations. Contact us with your clearance dimension before ordering.
• Frame dimensions vs. standard sizes: Built-in bed frames are sometimes built to standard Canadian mattress dimensions (Twin: 38" x 75", Double: 54" x 75", Queen: 60" x 80", King: 76" x 80"). More often, particularly in heritage homes and custom renovations, they are built to slightly non-standard dimensions. Measure the interior frame dimension before ordering any mattress.
• Access and installation: Getting a mattress into a built-in alcove or upper bunk can require a mattress that can be bent or rolled during installation. Foam-based mattresses are more flexible during installation; pocketed coil mattresses are more rigid. For very tight alcoves, discuss installation access with us before ordering.
• Murphy bed compatibility: Murphy (wall) beds require a specific mattress profile, both in height and rigidity. Mattresses that are too thick or too heavy create problems for the mechanical fold mechanism. We can advise on compatible options for specific Murphy bed systems.

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Window Seat and Bay Window Cushions

Window seats and bay window benches in Canadian homes are frequently used as informal resting, reading, and occasional sleeping spaces, particularly in children's rooms and sunlit reading rooms. The mattress or cushion for these spaces is a design element as much as a functional one.

Window seat cushions typically range from 10 to 15 cm in thickness and are sized to the specific bench dimension. Standard mattress products are generally too thick for most window seat applications, but a mattress topper or a specifically dimensioned foam insert can serve this function well. For window seats used primarily as seating with occasional resting, a firm foam insert provides the best durability. For window seats used regularly as a sleeping space (particularly in guest spaces), a thicker mattress profile is appropriate.

Key practical note: window seat benches in heritage and custom homes are almost never standard dimensions. Always measure the bench interior before ordering any cushion or mattress product.

Reading Nook Mattresses

Reading nooks, whether built into existing wall space, under staircases, or within custom-designed alcoves, are increasingly featured in Canadian home design. A reading nook that functions as a lying-down space for reading, napping, or children's play requires a cushioned surface that balances comfort, durability, and suitability for the space.

For reading nooks used primarily for sitting and leaning rather than lying flat, a medium-firm foam pad (5 to 10 cm) provides the best balance of support and durability. For nooks large enough to lie in comfortably, a twin or twin XL mattress at low profile will serve the space well. Children's reading nooks benefit from a firmer, more durable surface that can withstand varied use.

The same sizing caution applies: reading nook spaces in custom homes are almost never standard dimensions. Measure carefully and contact us with dimensions before ordering.

When You Need a Custom Size

Most Canadian homeowners with non-standard sleeping spaces discover that their dimensions are either close to a standard size (in which case a standard mattress fits with a small gap) or genuinely non-standard (in which case custom manufacturing is required).

The Canadian standard mattress dimensions most likely to fit non-standard spaces:

• Twin: 38" wide x 75" long (96.5 x 190.5 cm)
• Twin XL: 38" wide x 80" long (96.5 x 203 cm)
• Double/Full: 54" wide x 75" long (137 x 190.5 cm)
• Queen: 60" wide x 80" long (152.5 x 203 cm)
• King: 76" wide x 80" long (193 x 203 cm)

For spaces that fall between these standard dimensions, a gap of 2 to 5 cm on each side of the mattress is usually acceptable and often preferable to a fitted custom size (which allows for easier removal for maintenance). For spaces more than 5 cm off a standard dimension, a custom size mattress may be required.

Custom sizing is available on specific models in our lineup with additional lead time, typically two to four weeks. Contact us at (519) 770-0001 with your exact dimensions and we will advise on which models and sizes are available.

Design Spaces and Real Sleep Quality

The design impulse behind a built-in bed, window seat, or reading nook is usually about creating a purposeful rest space: a specific place in the home that is dedicated to rest, reading, and quiet. The quality of the sleeping surface in these spaces determines whether they deliver on that intention.

Radwan et al. (2015) in Sleep Health found that mattress construction type has a measurable effect on sleep quality outcomes, with pocketed coil designs outperforming traditional alternatives on sleep architecture and physical comfort.^[1] A beautifully designed reading nook or alcove bed that uses an inadequate sleeping surface may create the right visual environment but fail to deliver the restorative rest the design intends.

Jacobson et al. (2008) in the Journal of Chiropractic Medicine found that replacing inadequate sleep surfaces produced measurable improvements in sleep quality and physical comfort within 28 days.^[2] This applies equally to built-in alcove beds and custom sleeping spaces as to standard bedroom mattresses.

Kovacs et al. (2003) in The Lancet established that mattress firmness has a clinically significant effect on back pain and sleep quality.^[3] Medium-firm pocketed coil options perform best across the broadest adult population, including for use in non-standard sleeping spaces.

Product Recommendations for Custom Spaces

Sources:

1. Radwan A, et al. Effect of different mattress designs on promoting sleep quality. Sleep Health. 2015;1(4):257–267.
2. Jacobson BH, et al. Effect of prescribed sleep surfaces on back pain and sleep quality. Journal of Chiropractic Medicine. 2008;7(4):132–139.
3. Kovacs FM, et al. Effect of firmness of mattress on chronic non-specific low-back pain. Lancet. 2003;362(9396):1599–1604.
4. Okamoto-Mizuno K, Mizuno K. Effects of thermal environment on sleep and circadian rhythm. Journal of Physiological Anthropology. 2012;31(1):14.
5. Gordon SJ, Grimmer-Somers K, Trott P. Sleep position, age, gender, sleep quality and waking cervical symptoms. Internet Journal of Allied Health Sciences and Practice. 2009;7(4).