Hide Wiring in Coving Safely for UK DIYers and When to Call a Pro

Yes, coving can hide wires, but only when the cable route sits within a recognised safe zone or the cable itself has mechanical or RCD protection. Before you pick up a mitre saw, check the route with a cable detector and, if there is any doubt about what is behind the wall or ceiling, switch off the circuit and bring in an electrician. Get this part right and coving becomes one of the neatest ways to tidy a room’s wiring.

TL;DR:

• Coving can hide wires only if they are within a recognized safe zone or protected by mechanical or RCD safeguards, according to BS 7671.
• Hollow polyurethane or plastic coving is ideal for short, low-risk runs with ample cavity space, while solid plaster coving is mainly decorative.
• Proper cable routing during installation involves checking with a detector, marking guidelines, feeding the cable beforehand, and supporting coving with pins until adhesive sets.
• For cables close to surfaces or in high-risk areas, earthed trunking or conduit offers the necessary mechanical protection instead of relying solely on coving.
• Always photograph and record concealed cable routes, and use a cable detector before drilling in future to avoid accidental damage.

Table of Contents

• Practical methods for hiding wires with coving
• How to fit coving around an existing cable, step by step
• What BS 7671 says about concealing cables safely
• Choosing the right coving profiles, adhesives and trunking
• Finishing the job and protecting cables for the long term
• Carl’s installer tip
• How Coving.Online can help with your project
• Sources
• FAQ

Practical methods for hiding wires with coving

The right method depends on the wall type, how deep the cable sits, and whether it already has some form of protection. Hollow polyurethane or plastic coving profiles are the simplest option for short, low-risk runs, since the void inside the profile gives you somewhere to feed a cable once the safe zone rules allow it. Solid plaster coving can cover a run too, but its shape rarely leaves the same usable cavity, so it suits decoration more than concealment.

Surface trunking fitted beneath or behind the coving line adds proper mechanical protection and keeps the run accessible if you ever need to add or replace a cable. Where a cable sits closer than 50mm to the surface, or runs through a location prone to future drilling, earthed metal conduit or trunking is the safer choice rather than relying on the coving alone. For a full rewire, or where you are already opening up ceilings, routing cable through the void above the ceiling line or inside the wall cavity is usually the tidier long-term solution.

• Hollow coving concealment: best for short, low-voltage or well-protected runs within a safe zone.
• Surface trunking at coving level: adds mechanical protection and keeps the route serviceable.
• Metal conduit or earthed trunking: needed where cables sit within 50mm of the surface or in higher-risk spots.
• Ceiling-void or wall-cavity routing: the practical choice during a rewire or major renovation.

How to fit coving around an existing cable, step by step

Once you know which method suits your wall, the fitting sequence itself follows a familiar pattern, adjusted to accommodate the cable.

1. Check before you cut anything. Sweep the route with a cable detector, confirm which areas fall inside the safe zones, and switch off the relevant circuit if you are not certain what lies behind the surface. Photograph the route before you cover it, so you have a record for later.
2. Mark your guidelines. Draw ceiling and wall lines around the room and test-fit each length of coving before cutting, checking corners and any obstructions.
3. Mark the ceiling side before cutting. Flip the profile in the mitre box so the mitre fits correctly. Test-fit mitres against each other before applying any adhesive, a habit that saves a good deal of rework.
4. Feed the cable into place. If you are using trunking or the coving’s own hollow cavity, lay the cable in now rather than after fixing, and clip it inside the trunking regularly to prevent sagging or chafing.
5. Fix the coving. Apply a trade adhesive so it overspills the groove and makes direct contact with both the wall and ceiling surfaces, following the manufacturer’s installation guidance. Support longer lengths with panel pins at around 600mm centres while the adhesive cures, and cut mitres with a mitre box or power mitre saw for long, continuous runs.
6. Finish and record. Remove the temporary pins once cured, fill the joints with a suitable filler, and allow roughly 24 hours before painting, following tested best practice for coving installation. Note the cable’s exact position somewhere you will find it again, such as a maintenance file or a marked photograph.

What BS 7671 says about concealing cables safely

Before any cable disappears behind coving, it is worth understanding the rule that governs it. Regulation 522.6 of the wiring regulations states that cables installed less than 50mm from a wall or ceiling surface must either sit within a prescribed safe zone or be given mechanical protection or 30 mA RCD protection, as set out in industry concealed cable guidance.

The safe zones themselves are fairly easy to remember: a 150mm band running horizontally from the ceiling line, and a further 150mm from corners and edges, with additional zones running to and from accessories such as switches and sockets. On stud partitions and other thin walls, these zones can extend right through to the opposite face, so check both sides before fixing anything.

Where a cable falls outside these zones, or you simply cannot verify its depth, an accepted protection is required: earthed conduit, earthed trunking, armoured cable to the appropriate British Standard, or 30 mA RCD protection. A depth detector is worth the few pounds it costs, and older properties deserve extra caution, since their wiring may well predate these routing conventions. Any change to fixed wiring itself should go to a competent electrician rather than being treated as a coving job.

Choosing the right coving profiles, adhesives and trunking

Hollow polyurethane or plastic coving profiles suit cable concealment far better than solid plaster coving, since their internal cavity gives the cable somewhere to sit rather than relying on decoration alone. Where you also want ambient lighting, an LED-ready profile does double duty, hiding the cable run while housing the light strip itself. Orac Decor’s installation notes recommend applying adhesive so it overspills the groove and bonds properly to both surfaces, a technique often referred to as DecoFix Power application, and allowing around 24 hours’ cure before removing supports.

• Profiles: hollow polyurethane or plastic for concealment, LED-ready profiles where lighting is wanted.
• Adhesives: a trade adhesive applied with the overspill technique, cleaned off within the product’s stated working time.
• Trunking: sized generously for the cable bundle, with metal conduit reserved for locations needing mechanical protection.
• Tools: cable detector, mitre box or saw, caulking gun, spirit level, tape measure, safety goggles and a stable ladder.

Finishing the job and protecting cables for the long term

A neat finish is only half the job. Once adhesive has fully cured, use a proper trade filler on the mitres and joints, prime any pre-primed profile where the manufacturer recommends it, and follow a sensible paint sequence rather than rushing the topcoat.

The bigger risk comes later, when someone (possibly you, a few years on) drills into the wall without knowing a cable is there. Photograph every concealed run before you close it up, keep a note in a house file, and consider a simple warning label near a loft hatch or consumer unit if a cable sits shallower than ideal. Whenever you or anyone else drills near a ceiling line or corner in future, run a detector first and treat older wiring as unpredictable: if there is any doubt at all, call an electrician rather than guessing.

Carl’s installer tip

In our experience, most coving problems trace back to skipped checks, not bad cutting. Mark the ceiling side before you cut, test-fit every mitre, and don’t trust adhesive alone to hold a long run while it cures.

Pro Tip: Mark guidelines around the whole room from a single offcut, support long lengths with panel pins, and peel off any protective film only once the piece is in its final position.

— Carl

How Coving.Online can help with your project

If you would rather start with the right materials than trial and error, Coving.Online stocks hollow polyurethane coving from Orac Decor and NOËL & MARQUET, including LED-ready profiles for anyone combining wire concealment with ambient lighting. Our Cornice & Coving range covers both traditional and contemporary styles, and the shop carries the trade adhesives and fillers you will need to finish the job properly.

For projects requiring professional installation, such as runs needing earthed conduit, RCD protection, or rewiring, a national installer network can provide fitting services. Browse the Installation page to see how a professional fit works, or head to Cornice & Coving to find a profile for your room.

Sources

• Installation of Cables Concealed in Structures (Select guidance)
• Cable safe zones: wiring regulations explained | Total Skills UK
• How to install coving to add a touch of period charm | Homebuilding
• Orac Decor installation instructions (DecoFix Power guidance)

FAQ

Can I hide cables behind coving?

Yes, provided the cable either sits within a recognised safe zone or has mechanical or RCD protection, following BS 7671 guidance on concealed cables. Hollow coving profiles work best for this, since they leave a cavity for the cable rather than relying on decoration alone.

How can I cover up exposed electrical wires?

Coving, surface trunking, or a conduit run are the three most reliable options, chosen according to how close the cable sits to the surface. Where a cable is shallow or in a high-risk spot, mechanical protection such as earthed trunking or conduit is the safer route.

What are some clever ways to hide cables?

Beyond coving, trunking fitted along a skirting or coving line, cable clips inside a moulding cavity, and routing through a ceiling void all keep wiring out of sight without exposing it to damage. The best choice depends on whether you are working around an existing wall or starting from bare plaster.

How can I hide wires in an exposed ceiling?

Run the cable within the ceiling’s own safe zone, typically the 150mm band along the wall-ceiling junction, then conceal it behind a hollow coving profile or trunking fitted at that line. Always check with a cable detector first, since older ceilings may not follow modern safe zone conventions.

Does Coving.Online supply coving suitable for hiding cables?

Coving.Online stocks hollow polyurethane profiles from Orac Decor and NOËL & MARQUET, including LED-ready options, which suit cable concealment better than solid plaster coving. Where the job involves electrical protection work, our Elite Decor UK installer network can also arrange professional fitting.

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