Best Conduit & Housings in the UK: Where to Buy, What to Choose, and How to Save

Introduction: Why choosing the right conduit and housings matters

Picking the right conduit and housings isn't just about tidy cables—it's about safety, longevity, and making future upgrades painless. Whether you're rewiring a room, running cables in a garden outbuilding, or working on a commercial site, the right conduit system protects conductors from moisture, sharp edges, and wear. In the UK market you'll find everything from simple PVC conduit to heavy‑duty metal trunking, and the stores that stock them range from trade-only suppliers to general DIY outlets. This guide helps you navigate those options, points you to the best UK retailers, and gives practical tips so you buy what you actually need.

What are conduit housings and why use them?

Conduit housings refer to the channels, boxes, junctions, and fittings that carry and protect electrical cables. Think of them as the pipes for your electrical wiring—without good pipes you get leaks, blockages, or collapse. Conduit systems reduce mechanical damage, shield against water and dust when rated correctly, and make maintenance easier because cables can be replaced or rerouted without tearing walls down. For small jobs a surface-mounted trunking or conduit might be perfect; larger or outdoor installations often require metal conduit or weatherproof junction boxes rated to specific IP levels.

Types of conduit and housings: quick overview

There are several common conduit types you’ll see in the UK. Rigid conduit provides strong mechanical protection, flexible conduit makes tight bends simpler, and surface trunking keeps installations neat on walls and ceilings. Choosing the right type depends on where you’re working, what the cables are for, and whether the installation needs to be seen or hidden. Below are the main varieties broken down so you can match them to your project.

Rigid conduit (steel, EMT, and PVC)

Rigid conduit is the go-to when mechanical protection is a priority. Steel conduit or electrical metallic tubing (EMT) withstands knocks in workshops or garages, while rigid PVC is cheaper and resists corrosion in damp environments. Rigid systems are great where cables are unlikely to move and you want long‑term protection. Sizes are commonly given in inches—1/2", 3/4", 1" and larger—so pick a diameter that allows for adequate cable fill.

Flexible conduit (braided and corrugated)

Flexible conduit is ideal where you need to route wiring around bends or through moving parts. Corrugated plastic conduit is lightweight and easy to cut, while metal braided conduit offers extra protection and grounding. Use flexible conduit for appliance connections or in installations where vibration is present. It’s measured in inches too, typically 3/8", 1/2", and 3/4" for domestic uses.

Surface trunking and raceways

Surface-mounted trunking is perfect for keeping cables neat on brick or plastered walls without chasing. Trunking comes in shallow and deep profiles, with snap-on lids and internal compartments for separating power and data lines. Profiles may be specified in inches—common depths are about 1/2" to 2"—so choose based on the number of cables and the wall space available.

Junction boxes and inspection housings

Junction boxes provide accessible points for splicing and branching cables. Choose hubs rated for the environment: indoor boxes for dry spaces, IP65 or higher for outdoor or damp areas. Boxes come in various sizes; a small 3" x 3" box might suit a simple light junction, while larger enclosures are needed for multi‑cable terminations.

Materials and finishes: what they mean for durability

Conduit and housings are made from several materials, each with pros and cons. Plastic options like PVC reduce cost and resist corrosion, but don’t offer the same mechanical strength as metal. Galvanised steel and aluminium are robust choices where knocks or rodent protection are concerns. Finish matters too—powder coat or paint can improve longevity in exposed locations. Always match the material to the demands of the environment.

PVC: light, cheap, and corrosion-resistant

PVC conduit is widely used for indoor and some outdoor applications because it resists moisture and is easy to cut. It’s also electrically insulating, which can be an advantage for certain installations. If you’re running low-voltage or signal cables in a dry interior, PVC often offers the best value for money and is simple to install with solvent welds or push‑fit systems.

Metal conduit: strength and grounding

If toughness and grounding are priorities, metal conduit is the answer. Steel or aluminium conduits can dampen electromagnetic interference and provide a reliable earth path when installed correctly. Metal is heavier and more expensive, but in commercial or industrial settings where protection from impact or rodents matters, it’s worth the investment.

Top UK stores to buy conduit & housings

UK shoppers have a rich choice of retailers that stock conduit, housings, and fittings. Below are the recognised suppliers where you can find everything from basic trunking to trade‑grade metal conduit. Each retailer offers a slightly different mix of price, availability, and specialist products—so I’ll highlight the strengths to help you decide where to look first.

Screwfix

Screwfix is a go-to for many DIYers and tradespeople because of its vast selection and fast availability. You’ll find PVC conduit, trunking, junction boxes, and a wide range of fittings in common sizes like 1/2" and 3/4". Screwfix often stocks trade packs and has clear spec sheets so you can match sizes and cable fills quickly.

Toolstation

Toolstation competes closely with Screwfix on price and convenience. Their online catalogue includes flexible conduit, metal conduit, and practical accessories such as clips and glands. Toolstation is strong for impulse buys—if you need a quick few fittings to finish a job, they’re a reliable stop.

RS Components

RS Components is ideal if you’re after specialist or industrial-grade components. They offer a wide range of sizes and certified products, including IP‑rated enclosures, cable glands, and metal conduit systems. If your project demands technical specs or standards compliance, RS often has detailed datasheets and product filters to help you pick the right item.

City Electrical Factors (CEF) and Edmundson Electrical

CEF and Edmundson are trade-facing electrical wholesalers with extensive product lines. If you’re working on a larger project, joining a trade account with these suppliers can unlock trade prices and bulk options. They stock everything from lightweight trunking to heavy duty conduit and industrial enclosures.

B&Q, Wickes, and Homebase

For homeowners and smaller jobs, big-box DIY stores like B&Q, Wickes, and Homebase are convenient. Their ranges are focused on commonly used products—PVC conduit, surface trunking, and basic junction boxes—often available in convenient small packs. These stores are excellent when you need standard items without the complexity of trade systems.

Travis Perkins and Jewson

Builders merchants such as Travis Perkins and Jewson stock broader building supplies and are useful for combined jobs involving both electrical and structural work. They can also supply larger conduit runs and robust housings for exterior installations, and they often serve building contractors who need same-day collection.

How to choose the right size and fittings

Choosing the correct conduit diameter is essential to avoid cable overheating and difficult pulls. A conduit that’s too small makes installation hard and can damage insulation. Use cable fill tables to calculate how many conductors fit safely—these tables usually express conduit sizes in inches and show percent fill ratios. As a quick rule, avoid exceeding about 40% fill for circuits that will be pulled through long runs or have multiple bends.

Understanding cable fill and bend radius

Cable fill relates to the cross‑sectional area of conductors versus the internal area of the conduit. Bend radius is equally important: flexible cables must not be forced into tight curves. For example, a run using 3/4" conduit will allow more conductors and gentler bends than a 1/2" conduit, reducing strain during installation. Always plan layouts with gentle sweeping bends rather than sharp corners to keep pulls easy.

Installation tips and common mistakes

Many installation problems come down to planning. Sketch your conduit runs before you cut anything, check for obstructions like joists or pipework, and pre‑measure bends and junction locations. Use proper glands and grommets where the conduit meets boxes to prevent abrasion, and secure runs with clips every few feet so the system remains rigid and neat. Small cheap fixes in planning save hours later on site.

Common pitfalls to avoid

Common errors include overfilling conduit, using the wrong material for outdoor exposure, and neglecting to allow for future cable additions. Don’t compromise on box sizes—cramped junction boxes make safe terminations difficult. Also, ensure that any metal conduit is electrically continuous or that appropriate bonding is applied if used as part of the earth path.

Cost-saving tips and where to find deals

You don’t have to spend a fortune to get a durable installation. Buying trade packs, using multipacks at big-box stores, or purchasing from wholesalers can reduce per‑unit costs dramatically. Keep an eye out for seasonal sales at Screwfix and Toolstation, and check RS Components for clearance lines on discontinued items. If you’re working on multiple properties or a large job, a trade account with Edmundson or CEF can unlock better pricing.

When to splurge and when to save

Spend on materials where failure is expensive—outdoor enclosures, metal conduit in high-traffic areas, and IP‑rated boxes for damp zones. Save on internal, hidden runs where PVC or lower-cost trunking suffices. The trick is to balance upfront cost with longevity: a slightly pricier metal conduit in a workshop often pays for itself over the years.

Safety and compliance: standards and IP ratings

All electrical housings and conduit must meet relevant British Standards and be suitable for the intended environment. Look for BS EN markings and IP ratings—the latter tells you how well a housing resists dust and water. For outdoor or damp locations choose IP65 or above; for indoor dry spaces lower ratings are usually acceptable. Following standards ensures installations pass inspection and remain safe over time.

Labels to check before buying

Before you buy, check product labels or datasheets for BS, EN, or IEC compliance and the IP rating. Also look for temperature ratings if you’ll be running warmer cables or near heat sources. Retailers like RS Components and trade wholesalers provide technical datasheets which make compliance checking straightforward.

Eco considerations and recycling

Increasingly, installers and homeowners want greener materials. PVC is durable but can be less eco‑friendly to dispose of, while metal conduit is more recyclable at end of life. Some suppliers offer recycled plastic trunking or take‑back schemes—ask your retailer if they have eco options or recycling programs. Choosing recyclable materials and reducing waste on site contributes to lower lifetime environmental impact.

Finding the right balance: trade vs DIY buying

If you’re a one‑off DIYer, large DIY stores and online marketplaces are convenient and cost-effective. For regular or commercial work, trade suppliers give access to broader ranges and bulk discounts. Consider whether you'll need technical support, datasheets, or certification—if so, wholesalers and specialist electrical retailers are worth the slight price premium for peace of mind and product choice.

Conclusion: Selecting conduit and housings is a smart mix of specification, environment, and budget. By understanding the types, materials, and how to size systems correctly, you can protect cables, reduce future maintenance, and stay compliant. Shop at the right UK retailers depending on your needs—Screwfix and Toolstation for convenience, RS and trade wholesalers for technical depth—and use these tips to plan better, save money, and finish cleanly.