how to make a single bed into a double

 

How to Make a Single Bed Into a Double: Practical Ways to Create More Sleeping Space

A single bed is perfect for small rooms, children, and guest spaces — but sometimes it simply isn’t wide enough. Whether you need extra room to stretch out or want to accommodate two sleepers, you might be wondering: Can you turn a single bed into double?

While you can’t magically stretch a mattress, there are several smart and practical ways to expand your sleeping space without immediately buying a brand-new bed. In this guide, we’ll explore budget-friendly options, semi-permanent upgrades, and long-term solutions to help you turn your single bed into something that feels like a double.


First, Understand the Size Difference

Before making changes, it helps to know what you’re working with.

A standard single bed is typically:

  • 90 cm × 190 cm (UK)

  • 96.5 cm × 190.5 cm (US Twin)

A standard double bed is usually:

  • 135 cm × 190 cm (UK)

  • 137 cm × 190.5 cm (US Full)

That means you need roughly 45 cm (18 inches) of extra width to truly match a double.

Option 1: Put Two Single Beds Together 

The simplest and most common solution is placing two single beds side by side.

Why This Works

  • Instantly doubles your width

  • Creates a surface close to king-size depending on measurements

  • Works well for couples or guest rooms

  • Can be separated again if needed

How to Make It Seamless

  1. Push both bed frames tightly together.

  2. Use a mattress connector strap to prevent gaps.

  3. Add a large mattress topper over both mattresses.

  4. Cover with a large fitted sheet (double, queen, or king depending on total width).

This method is often used in hotels because it allows flexibility between twin and larger bed configurations.

Option 2: Add a Custom Bed Extension Platform

If you only have one single mattress but want extra width, you can build or buy a wider base platform.

How It Works

  • Build a wooden platform wider than the mattress

  • Add a second mattress or thick topper to fill the extra width

  • Secure everything to prevent shifting

This solution works best for DIY enthusiasts and offers a semi-permanent upgrade.

Option 3: Use a Trundle Bed

If you need extra sleeping space occasionally, a trundle bed is a smart solution.

A trundle:

  • Sits underneath the main single bed

  • Pulls out when needed

  • Can sit level with the main mattress (if designed that way)

When extended and aligned, it can create a surface similar in width to a double bed.

This is perfect for:

  • Guest rooms

  • Children’s sleepovers

  • Small apartments

Option 4: Upgrade the Bed Frame and Mattress

Sometimes the most practical option is upgrading fully.

If your room allows, replacing your single bed with a proper double frame and mattress:

  • Improves long-term comfort

  • Eliminates gaps and uneven surfaces

  • Provides better structural support

If budget is a concern, consider:

  • Selling your single bed

  • Looking for second-hand double frames

  • Shopping during mattress sales

Option 5: Make It Feel Like a Double 

If replacing or combining beds isn’t possible, you can at least make your single bed feel larger and more luxurious.

Use a Double Duvet

An oversized duvet adds:

  • Extra coverage

  • A fuller look

  • More comfort for shared sleeping

Choose Wider Bedding

Loose, flowing bedding visually expands the bed’s appearance.

Push Against a Wall

Placing the bed against one wall:

  • Removes one exposed edge

  • Makes it feel less narrow

  • Creates a cozy daybed effect

While these tricks don’t change the mattress size, they improve comfort perception.


Option 6: Mattress Topper + Foam Extension

For a temporary solution, you can:

  • Place firm foam padding beside the mattress

  • Add a large topper across the entire surface

  • Cover everything with one large fitted sheet

This can add limited width but works best for short-term arrangements.

Important Considerations

Before converting your bed, think about:

Room Size

Will a wider bed restrict movement?

Frame Strength

Can your current frame handle added weight?

Mattress Height Alignment

If combining two beds, both mattresses should be equal height for comfort.

Budget

Sometimes investing in a proper double bed is more cost-effective long term.

Pros and Cons of Converting a Single to a Double

Pros

  • More sleeping space

  • Budget-friendly options available

  • Flexible configurations

  • Great for guest rooms

Cons

  • May not feel fully seamless

  • Potential gap between mattresses

  • Requires careful securing

  • Might take up more room than expected

1. Can you turn one single mattress into a double?

No, a single mattress cannot physically expand. You must add another mattress or replace it with a wider one.

2. Is putting two single beds together comfortable?

Yes, especially if you use a mattress connector and topper to eliminate the gap.

3. Is it cheaper to combine two singles or buy a double?

It depends. If you already own two singles, combining them is cheaper. If buying new, a proper double may be more practical.

4. Will a double fitted sheet fit over two single beds?

It depends on total width. In some cases, you may need a king-size sheet for full coverage.

5. Is this solution good for couples?

It can work temporarily, but couples often prefer a proper double or larger mattress for consistent comfort.

6. How much extra width does a double bed have compared to a single?

Approximately 45 cm (18 inches) wider.

Turning a single bed into a double is absolutely possible — but it requires creative solutions. The most effective method is combining two single beds with a connector and topper. For occasional use, a trundle bed works well. And if long-term comfort is the goal, upgrading to a proper double frame and mattress may be the best investment.


Ultimately, the right solution depends on your space, budget, and how often the bed will be used by two people.

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