How to Expand a Mini Flow Hive

Mini Flow–style hives are a great way to get started, but one major limitation quickly shows up: expandability. Unlike standard Langstroth equipment, mini hives don’t offer easy access to additional brood boxes or replacement frames. Once the colony grows, space becomes a real concern.

When our bees began to outgrow their mini brood box, we needed a solution that would:

• Give the colony more room immediately
• Allow the queen to expand upward naturally
• Transition the hive into standard Langstroth equipment
• Avoid cutting or modifying frames

The solution was a simple adapter board…a flat board that bridges the mini hive to a standard box above it.

This method worked extremely well for us, and it can be replicated with basic tools and materials.

The Goal

• A Mini Flow brood box (non-standard size) on the bottom
• A standard Langstroth deep or nuc box on top

Create a stable bridge between the two.

This allows bees, and eventually the queen, to move upward, draw comb, and expand the colony safely.

Materials Needed

Wood & Tools

• Exterior plywood (½” or ¾” thick)
• Measuring tape
• Pencil or marker
• Jigsaw (or hole saw)
• Drill
• Sandpaper
• Screws (optional, for stability cleats)

Bee Equipment

• Mini Flow brood box (existing hive)
• Standard Langstroth deep or nuc box
• Frames with foundation or drawn comb
• Lid (telescoping cover)
• Optional: queen excluder (used later, not immediately)

Step-by-Step: Building the Adapter Board

Step 1: Measure the Upper Box Footprint

Determine which standard box you’ll place on top.

• 10-frame deep: approx. 16¼” × 22”
• 8-frame box: approx. 14” × 22”

Cut the plywood to match the exact footprint of the box going on top. This ensures stability and eliminates gaps.

Step 2: Trace the Mini Hive Opening

Set the mini brood box on the plywood and trace its footprint.

You’ll cut an opening slightly smaller than the outer dimensions so the mini box sits securely and bees can move upward.

Example:

If the mini box footprint is 10” × 14”, cut an opening around 9” × 13”.

Step 3: Cut the Central Opening

Drill a starter hole and use a jigsaw to cut out the opening.

This becomes the main “bee highway” between boxes.

Smooth all edges with sandpaper to prevent splinters or gaps.

Step 4: Assemble the Stack

Your hive stack should look like this (bottom to top):

1. Mini Flow brood box
2. Adapter plywood board with central opening
3. Standard Langstroth box (deep or nuc)
4. Lid

Everything should sit flat with no wobble and no gaps.

If needed, attach small wooden cleats or rails under the plywood so it locks neatly onto the mini hive.

Setting Up the Upper Box

Step 5: Add Frames Above

In the standard box above the adapter board:

• Use 5 frames (for a nuc) or 8–10 frames (for a deep)
• Best setup:
  
• 1–2 drawn comb frames in the center
• Foundation frames toward the outside
  

This encourages faster comb building and entices the queen upward.

Let the Bees Do the Work

Step 6: Allow Natural Expansion

Within days, you should see bees actively working in the upper box.

Over time, you’ll notice:

• Nectar and pollen storage
• Drawn comb
• Eventually, brood

Once comb is established, the queen typically moves up on her own.

Step 7: Confirm the Queen Is Laying Upstairs

Do not add a queen excluder immediately.

Wait until you actually see:

• Eggs
• Larvae
• A consistent brood pattern in the upper box

This confirmation is important before moving to the next step.

Optional Transition Step

Step 8: Add a Queen Excluder (Optional)

Once the queen is clearly laying in the upper box:

• Place a queen excluder between the boxes
• This prevents her from returning to the mini brood box

Allow approximately 21 days for all brood below to emerge.

Step 9: Monitor for Emergency Queen Cells

When brood is isolated below, nurse bees may attempt to raise emergency queen cells.

Check the lower frames after about 7 days and remove any queen cells if found.

Step 10: Remove the Mini Box

Once all brood has emerged from the mini box:

• Remove the mini brood box completely
• Place the standard box onto a normal bottom board

At this point, your colony is fully transitioned into standard Langstroth equipment.

Why This Method Works

This approach:

• Relieves overcrowding quickly
• Allows natural brood expansion
• Moves the colony into standardized equipment
• Avoids incompatible frame transfers
• Uses inexpensive, accessible materials

It’s especially effective in mild climates, where colonies can continue drawing comb without long interruptions.

Final Thoughts

If you’re using a Mini Flow–style hive and finding expansion options limited, this adapter board method is a practical, low-cost solution. It gives your bees the space they need while setting you up for easier hive management long-term.

Have questions about expanding a mini hive or transitioning to standard equipment? Feel free to reach out or explore more beekeeping guides on our blog.