Best Extension Housings in 2026

Daisy
Last Updated: Feb 7, 2026

At a Glance: Our Top Picks for Extension Housings

Southwire Southwire MSB1G One Gang Device Box with Depth Adjustable, Heavy Duty 42lb, Gray
#TOP1
Southwire Southwire Msb1G One Gang Device Box With
9.7
PM SCORE
MIGRO Electrical Weather-resistant Outdoor Junction Box (no gasket) , Plastic Weatherproof Outdoor Electrical Enclosure Box, Dustproof, Watertight, Heavy-Duty, 8.2 x 8.4 x 3.2 Inches (Interior) (Single Unit)
#TOP2
Migro Electrical Weather-Resistant Outdoor Junction Box (No Gasket)
9.7
PM SCORE
Hubbell-Raco 5406-0 Weatherproof Extension Box, 1 Gang, 18.3 Cu-in X 4-1/2 in L X 2-3/4 in W X 1 in D Grey
#TOP3
Hubbell-Raco 5406-0 Weatherproof Extension Box, 1 Gang, 18.3
9.7
PM SCORE

* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.

Summary of the Best Extension Housings of 2026

Market Overview
Extension Housings Reviewed
  • Reviews Analyzed: 10808 Items
  • PM Avg. Rating: 7.4 / 10
24 Products Evaluated
  • Highest Price: $39.99
  • Lowest Price: $3.04
  • Avg. Price: $12.69

Southwire Southwire Msb1G One Gang Device Box With Depth Adjustable, Heavy Duty 42Lb, Gray

SOUTHWIRE
MSB1G
3.39 X 2.24 X 3.82 Inches
0.25 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Country Of Origin : China

Product Type : Bearing And Bushing

Mounts To Wood Or Metal Stud 25G

Extra Thick Pvc Wall Material Creates Stability And Rigidity

Migro Electrical Weather-Resistant Outdoor Junction Box (No Gasket) , Plastic Weatherproof Outdoor Electrical Enclosure Box, Dustproof, Watertight, Heavy-Duty, 8.2 X 8.4 X 3.2 Inches (Interior) (Single Unit)

MIGRO
MIG-AMPH
9.40 X 9.20 X 4.10 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Electro Marketplace 7.82

Features

Outdoor Storage of Electronics

Heavy Duty, Weather Proof Thermo-Plastic Alloy

Continuous horizontal and vertical bosses provide a plethora of mounting options

Cable retention slots allow you to work outside the enclosure.

Quick Mount Rail - Any True Flex component snaps in without hardware

Interior Dimensions: 8.3" x 8.1" x 3.9"

Hubbell-Raco 5406-0 Weatherproof Extension Box, 1 Gang, 18.3 Cu-In X 4-1/2 In L X 2-3/4 In W X 1 In D Grey

BELL
5406-0
1.03 X 2.94 X 4.56 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

State of the art powder coat finish provides maximum weatherability and scratch resistance

Rugged die cast aluminum construction

Installation hardware and gasket included

9.5 cu. in. capacity

NEMA 3R Rated

Restmo Outdoor Ip44 Waterproof Connection Box, Weatherproof Electrical Extension Cord Cover, Safety Seal Enclosure To Protect Holiday Decorations, Led Strip Light, Power Tool, Fountain, Black

RESTMO
O-ECC-1
11.40 X 4.30 X 3.00 Inches
9.60 ounces
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Restmo 9.93

Features

Electrical Connection Box: Creates a watertight sealing space, keeps outdoor electrical connection dry and safety, ideal to protect outdoor landscape lighting, pool pump, power tool, fountain, Christmas decorations and other devices.

Wide Use: Compatible with straight and right-angle plugs, as well as most of bulky adapters, easy to seal AWG12-14-16 extension cord and flat cable.

Water & Dust Resistant: IP44 waterproof, protect against water, snow, rain, dust, dirt, and more.

Heavy Duty & Weatherproof: Constructed with industrial grade plastic, highly durable and UV resistant, withstand hard impacts and heavy force, great for outdoor harsh environment.

Easy to Use: No installation required, easily open with top lid and 4 snap joints, place the connection and cord properly, lock and seal.

Restmo 2 Pack Compact Outdoor Extension Cord Cover, Ip44 Waterproof Box And Safety Housing Case, Ideal To Protect Outdoor Plugs, Electrical Connections, Holiday Decoration Lights, Size Small, Black

RESTMO
O-ECC-2
7.09 X 2.24 X 2.24 Inches
0.20 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Restmo 9.93

Features

Upgraded Extension Cord Safety Cover: With 4 lockable latches, 2 cable clamps, 2 mounting holes and 2 cable ties, it creates a watertight sealing space, keeps outdoor & indoor electric connection dry and safety, easy to place and hang anywhere.

Mini Size Electrical Box: Compact dimension (7 x 2 x 2 inches) and light weight (3 ounces), no more drop when hanging up the housing case in the air. Widely compatible with up to AWG14 cord, flat cable and braided wire.

Water & Dust Resistant: IP44 waterproof with rubber seals at both ends, protect against water, snow, rain, dust, dirt, and more. Great to protect outdoor string light, landscape lighting, pool pump, garden power tool, fountain, Christmas and other holiday decorations.

Heavy Duty & Weatherproof: Constructed with industrial grade material, highly durable and UV resistant, withstand hard impacts and heavy force, great to use in outdoor harsh environment.

Easy to Use: No installation required, easily open with top lid and 4 latches, place the connection inside, fasten the cord with cable clamps, lock and seal.

Raco 187 Drawn Extension Ring, 22.5 Cu-In, 4 In L X W X 1-1/2 In D, Product Specific

RACO
187
20.00 X 13.50 X 7.50 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Anything Electric Supply 7.57

Features

Positioned to accommodate 1-2 switch boxes

Combination screw heads allow quick installation

Drawn construction

Eight 1/2 in. knockouts and four 3/4 in. knockouts

UL listed for your safety and peace of mind

22.5 cu. in. capacity

UPC barcoded

Tonyful Large Outdoor Electrical Box With Handle(12.5 X 5.5 X 10.23In), Indoor&Outdoor Safety Extension Cord Cover For Timers, Extension Cables, Plugs, Sockets, Holiday Light Decoration

TONYFUL
1
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
chenxuanamz 5.84

Features

FLAT TOP & WEATHERPROOF DESIGN: Compared to similar products on amazon, our electrical power cord enclosure with flat top design is not prone to water accumulation. This waterproof power cord connection box with professional IP55 waterproof rating, which protects against rain, snow, water, dust, dirt, and other outdoor irritants.

PREMIUM MATERIAL: Our weatherproof box is made with heavy-duty reinforced PP material. This construction design is great to use in outdoor harsh environment and continuously protect outdoor connections. Ideal for a wide range of outdoor & indoor applications including extension cord, LED string light, landscape lighting, pool pump, garden power tool, fountain, Christmas and other holiday decorations.

PORTABLE & EASY TO USE: Tonyful outdoor extension cord box with a handle and can be easily transferred to a suitable location. No Permanent Installation Required! The Innovative Interlocking Lid Opens Easily & Molds Tightly Around Power Cords When Closed. Size Medium is Perfect for Protecting Power Strips, Surge Protectors, Plug-In Timers, Extension Cords & Other Multi-Socket Gear.

WIDE COMPATIBILITY: This outdoor waterproof electrical box dimensions are 14.76 x 5.51 x 10.23 inches, which can protect your power strip, timer outlet, bulky adapter and more outdoor/indoor electrical connections. The 6 cable seal ports6 cable entry ports (front*4 + side*2) are all compatible with AWG12/14/16 cord, flat cable and braided wire. Keep All Your Home Electrical Equipment Safe & Dry.

EXCELLENT SERVICE: Designed to keep cord connection secure and protected. It is an ideal gift for a wide range of lawn and garden applications. This outdoor connection box provide a lifetime replacement warranty. If anything ever goes wrong with this weatherproof outlet box, we will send a replacement for you.

Restmo 4 Pack Mini Ip44 Waterproof Outdoor Connection Box With Lockable Latches And Mounting Holes, Weatherproof Extension Cord Safety Cover For Outdoor Plugs, Lights, Cables, Wires, Size Small, Black

RESTMO
O-ECC-2
7.09 X 2.04 X 2.04 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Restmo 9.93

Features

Upgraded Extension Cord Safety Cover: With 4 lockable latches, 2 cable clamps, 2 mounting holes and 2 cable ties, it creates a watertight sealing space, keeps outdoor & indoor electric connection dry and safety, easy to place and hang anywhere.

Mini Size Electrical Box: Compact dimension (7 x 2 x 2 inches) and light weight (3 ounces), no more drop when hanging up the housing case in the air. Widely compatible with up to AWG14 cord, flat cable and braided wire.

Water & Dust Resistant: IP44 waterproof with rubber seals at both ends, protect against water, snow, rain, dust, dirt, and more. Great to protect outdoor string light, landscape lighting, pool pump, garden power tool, fountain, Christmas and other holiday decorations.

Heavy Duty & Weatherproof: Constructed with industrial grade material, highly durable and UV resistant, withstand hard impacts and heavy force, great to use in outdoor harsh environment.

Easy to Use: No installation required, easily open with top lid and 4 latches, place the connection inside, fasten the cord with cable clamps, lock and seal.

Outdoor Extension Cord Safety Cover, Diivoo 3 Pack Weatherproof Electrical Connection Box To Protect Outdoor Plug, Outlet, Socket, Christmas Holiday Decoration Light

DIIVOO
DI-WCB02-ALGNP3-A303
6.85 X 2.00 X 2.00 Inches
0.68 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
DIIVOO 9.76

Features

Waterproof: This outdoor plug cover weatherproof is IPX4 waterproof. Sponge with groove on wire entry points will wraps the wire and keeps water out. They keep the connection dry and to protect your cord connections from getting pulled apart

Weather & Dust Resistant: With the 2 snap-lock lids secure outdoor extension cord cover fastened and create a watertight sealed space. Hassle-free to protect against water, snow, rain, dust, dirt, and more. Great to use in outdoor harsh environment

Heavy Duty: Weatherproof electrical box is made with reinforced PP material, high durability and UV resistance to withstand strong shocks and heavy force, helping to protect connected sockets and reducing the risk of electric shock

Mountable: Simple to hang the outdoor electrical box on any walls with the 2 mounting holes with screw. Perfect to seal 14/16 gauge cord and braided cable. Small size and lightweight make it can be flexible to place anywhere. Ideal for protecting outdoor decorative lights

Wide Application: This waterproof extension cord cover is ideal for a wide range of outdoor applications including lawn and garden power tools, Christmas holiday lighting, landscape decorations, pool pumps and more

1-Gang Weatherproof Extension Adapter, Two 1/2 In. Threaded Outlets, Gray

BELL
5399-0
1.38 X 2.84 X 4.56 Inches
0.35 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

State-of-the-art powder coat finish provides maximum weatherability and scratch resistance

Installation hardware, gasket and closure plugs provided

Pre-installed ground screw included

Internal threads and hubs comply with NEMA requirements

Hubs accept all threaded fittings and threaded conduit

Greenfield Made In The U.s.a. B001Aps Series Weatherproof Electrical Outlet Box Extension, Gray

GREENFIELD
B001APS
3.00 X 4.72 X 1.16 Inches
0.22 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Made in the U.S.A

UL Listed, Weatherproof

Diecast aluminum alloy, Durable powdercoat finish, Corrosion resistant

Easy to install

Sigma Engineered Solutions, Gray Sigma Electric 14223 1-Gang Extension Ring, 1 Count (Pack Of 1)

SIGMA ELECTRIC
14223
4.70 X 2.93 X 1.02 Inches
0.20 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Features 9.5 cu. in. capacity

Extension ring increases the capacity of a one-gang weatherproof box mounted in vertical or horizontal orientations

Includes gasket and (4) NO. 6-32 UNC-2A X 1.37-in screws

Die-cast metal construction and powder coated for corrosion resistance

Product is UL and CSA listed, suitable for wet locations and NEMA 3R rated

Steel City 59361-1/2 Handy/Utility Outlet Box Extension Ring, Drawn Construction, 4-Inch Length By 2-1/8-Inch Width By 1-7/8-Inch Depth, Galvanized

THOMAS & BETTS
593611/230
4.00 X 3.00 X 3.00 Inches
0.35 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Vento Group 6.32

Features

Steel

Galvanized

13 cubic-Inch capacity

Drawn construction

(3) 1/2 inch each side, (1) 1/2 inch each end knockouts

Taymac Se450S Weatherproof Box Extension, 1-Gang, (4) 1/2-Inch Outlets, Gray

TAYMAC
SE450S
1.65 X 3.49 X 5.21 Inches
0.20 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

State of the art powder coat finish provides maximum weather ability and scratch resistance

Weatherproof extension adapter with four 1/2-in. threaded outlets

Closure plugs, ground screw, and mounting hardware included

Aluminum die cast construction

Hubbell-Raco 111 Extension Ring Ceiling Outlet Box, 11.8 Cu-In, 3-1/2 In Dia X 1-1/2 In D, 3-1/2"

RACO
111
12.00 X 18.00 X 18.00 Inches
0.30 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

3-1/2-inch. Octagon extension

Metallic. 1-1/2" deep

Side knockouts: (4) 1/2"

Cubic inches: 11.8"

1-Gang Weatherproof Extension Adapter, Swing Arm, Six 1/2 In. Threaded Outlets, Gray

BELL
5414-0
1.50 X 5.25 X 3.50 Inches
0.75 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

State-of-the-art powder coat finish provides maximum weatherability and scratch resistance.

Closure plugs provided for two and six outlet styles.

Internal threads and hubs comply with NEMA requirements.

Hubs accept all threaded fittings and threaded conduit.

Multi-lingual instructions in each package.

Two closure plugs included.

Includes gasket and mounting hardware.

Greenfield Made In The U.s.a. Weatherproof Electrical Outlet Box Extension, White, (Rb25Aws)

GREENFIELD
RB25AWS
4.20 X 4.20 X 1.80 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Made in the U. S. A.

UL Listed, Weatherproof

Die cast aluminium alloy

Durable powder coat finish

Corrosion resistant

Greenfield Made In The U.s.a. Rb25Aps Series Weatherproof Electrical Outlet Box Extension, Gray

GREENFIELD
RB25APS
4.20 X 4.20 X 1.78 Inches
0.46 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Made in the U.S.A

UL Listed, Weatherproof

Diecast aluminum alloy, Durable powdercoat finish, Corrosion resistant

Easy to install

Qilipsu Ul94-V0 Pc/Abs Alloy Plastic Waterproof Junction Box, 11.4"X7.5"X5.5" Pro Ip67 Outdoor Electrical Enclosure With Mounting Plate, Wall Brackets, Grey Hinged Door Weatherproof For Projects

QILIPSU
QL-291914-G
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
QILIPSU 9.92

Features

【SUPERIOR MATERIA】- QILIPSU waterproof junction boxes are made from the finest UL94-V0 PC/ABS alloy plastic, it passed V0, IK10, ROHS 2.0 testing by TUV, offering numerous advantages over traditional ABS plastic. This premium material provides enhanced durability, superior resistance to high temperatures and pressures, and longevity that's second to none. It's the perfect solution for high-end projects that demand the highest-quality equipment.

【UNMATCHED VERSATILITY IN EXTREME CONDITIONS】- With a wide operating temperature range of -40℃ to 85℃, our electrical enclosure box allows you to take on more challenging projects with confidence. Whether you're working in harsh environments or demanding conditions, you can count on our product to perform and help you expand your capabilities and opportunities.

【IP67 RATED】- The electrical enclosure boxes feature an IP67 waterproof and weatherproof design, they offer superior protection against water, rain, dust, snow, oil, UV rays, and other environmental elements. This robust design makes it ideal for use in both indoor and outdoor settings, ensuring that your electrical equipment is protected from harsh conditions.

【EASY INSTALLATION】- Enjoy hassle-free setup with the included mounting plate, it designed to accommodate a wide range of equipment with ease, saving you valuable time and effort. Furthermore, the four included 304 stainless steel brackets provide versatility and stability for convenient wall mounting.

【CONVENIENT ACCESS】- Our project boxes with a simple hinged cover that opens and closes easily, with 304 stainless steel latches that provide a reliable and watertight seal, making it convenient for maintenance and operation.

【SUITABLE FOR DIY PROJECTS】 - This sturdy PC/ABS alloy plastic waterproof box is easily drillable and can be molded to fit your specific needs, making it the perfect choice for your creative DIY projects.

【DIMENSIONS】- The EXTERNAL size is 11.4"x7.5"x5.5" (290x190x140mm) for the weatherproof box. The INTERNAL size can be found in the dimension drawing.

【QILIPSU EXTENDED WARRANTY】- QILIPSU is a reputable brand that consistently prioritizes the needs and satisfaction of our customers, we offer an excellent extended warranty for easy returns or refunds even they are outside of Amazon's return policy. Please feel free to reach out to us via Amazon message, our after-sale team is dedicated to providing a prompt and satisfactory resolution to all your inquiries.

Raco 8203 Electrical Box Extension Ring, 1 Gang, 22.5 Cu-In, 4 In L X W X 1-1/2 In D, Color

RACO
8203
1.56 X 4.00 X 4.00 Inches
0.43 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Moofin 9.88

Features

Combination screw heads allow quick installation

Drawn construction

Eight 1/2 in. knockouts and four 3/4 in. knockouts

UL Listed

22.5 cu. in. capacity

UPC barcoded

Taymac Se450Wh Weatherproof Box Extension, 1-Gang, (4) 1/2-Inch Outlets, White

TAYMAC
SE450WH
1.65 X 3.49 X 5.21 Inches
0.12 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

State of the art powder coat finish provides maximum weatherability and scratch resistance

Rugged die cast metallic construction

Mounting hardware, installations instructions, and gasket included

Qilipsu Pole Mounting Kits, 304 Stainless 175X48Mm Brackets With Adjustable 50-200Mm Clamp For Outdoor Waterproof Junction Box, Plastic Electrical Enclosure Project Box (6.9"X1.9")

QILIPSU
QL
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
QILIPSU 9.93

Features

「SUPERIOR DURABLE」- Made of heavy duty 304 stainless steel, can be widely used for both indoor and outdoor applications.

「WIDELY ADJUSTABLE DIAMETER RANGE」- Adjustable 1.97"x7.87"(50-200mm) Clamps for mounting various poles between this diameter range

「WIDELY USED」- Match for QILIPSU 11.2"x7.7"x5.1" junction box or other boxes with suitable width

「MORE LOAD-BEARING」- 66lbs (30kg)

「PACKAGE」- 2 din rails, 2 adjustable clamps, 4 screws

「EXTENDED WARRANTY」- QILIPSU is a trustworthy brand who always consider “CUSTOMER FIRST”, so please don’t hesitate to contact us through Amazon message if you have any questions, our after-sale team will always provide the prompt response to solve your issues until you are satisfied.

Taymac Se475S Weatherproof Box Extension, 1-Gang, (4) 3/4-Inch Outlets, Gray

TAYMAC
SE475S
1.65 X 3.49 X 5.21 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

State of the art powder coat finish provides maximum weatherability and scratch resistance

Rugged die cast metallic construction

Mounting hardware, installations instructions, and gasket included

Nema 3R compliant

Greenfield Made In The U.s.a. Rb25Abrs Weatherproof Electrical Outlet Box Extension, Bronze

GREENFIELD
RB25ABRS
4.20 X 4.20 X 1.80 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Made in the U. S. A.

UL Listed, Weatherproof

Die cast aluminium alloy

Durable powder coat finish

Corrosion resistant

Top 10 extension housings Brands on Amazon

Here is the list of top-rated brands that were evaluated by PM.

Brand Count
Greenfield 4
Bell 3
Raco 3
Restmo 3
Taymac 3
Qilipsu 2
Diivoo 1
Migro 1
Sigma Electric 1
Southwire 1

Top 10 extension housings Brands Pie Chart


We've carried out a comprehensive analysis of 10,808 reviews on extension housings, using our selection criteria to identify the best options in the categories. Our findings reveal that most customers typically select extension housings priced around $12.69, with top brands including and

Our team of expert editors reviewed these high-quality items and handpicked the top 24 extension housings for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the categories category. These include and .

We are dedicated to assisting our users in finding the right boxes Products based on their needs, saving them considerable time when choosing which extension housings to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.