Repairs and aftercare · BT48

Safety edge and photocell repairs in Derry/Londonderry

For homes in Derry/Londonderry and elsewhere in County Londonderry, we trace safety device faults through the whole circuit, from the device and its cable to the control box. Any parts beyond the ones agreed are quoted before they're fitted.

Request a visit Call 0800 088 6248

Guide price: from £99 inc VAT
First step: Visit price agreed first
Covers: Derry/Londonderry, BT48
Area: County Londonderry

Rubber safety edge on a roller door bottom rail and a photocell sensor on the guide rail

Computer-generated image

What should I know about safety edge and photocell repairs in Derry/Londonderry?

Photocells can often be added to doors that only have a safety edge, if the control box allows it.
After a repair, the door is tested to check it stops or reverses on obstruction before it's handed back.
Replacement safety edges and photocell pairs have fitted prices, agreed before the visit is booked.
Never tape over, bridge or bypass a safety device to make an electric roller door close.

How does it work in Derry/Londonderry?

We confirm the visit price and the likely part before anything is booked. The visit date depends on engineer availability and is confirmed in writing.

STEP 01
Tell us about the door
Describe the door and what you need, with a photo or video if you can.
STEP 02
Agree the visit price
We confirm the visit price before anyone comes out.
STEP 03
Visit
The engineer finds the cause and makes the door safe where possible.
STEP 04
Parts quoted first
Any parts are quoted before they are fitted, so you decide.

How much do safety edge and photocell repairs cost in Derry/Londonderry?

Item	Guide price (inc VAT)	Ex VAT
Photocell pair replacement, fitted	£99–£189	£82.50–£157.50 + VAT
Safety edge replacement, fitted	£159–£295	£132.50–£245.83 + VAT

Guide prices for homes, last reviewed 25 October 2026. Your written quote is the price. See the full price list.

Covering Derry/Londonderry and nearby

We survey and fit roller garage doors across Derry/Londonderry, including BT48, as part of our coverage in County Londonderry.

Rules that apply in Derry/Londonderry

Powered door safety

Every powered door we fit is commissioned with force testing to BS EN 12453 and handed over with a Declaration of Conformity and CE marking, which is the marking that applies to machinery placed on the market in Northern Ireland.

Electrics

An electric door needs a power supply near the roller box. Part P does not apply in Northern Ireland, but electrical work must still meet BS 7671 and be carried out by a qualified electrician.

Safety edge and photocell repairs in Derry/Londonderry: questions

Can I message you a photo of my garage in Derry/Londonderry?

Yes. Photos of the opening, the inside of the garage above the door and any existing door help us give a more useful guide price for Derry/Londonderry. Send them by WhatsApp or mention them in your enquiry, and we will reply in writing.

Will you fix the door on the first visit?

A fault can sometimes be found and put right on the first visit, but we never promise it. If a part needs ordering, we quote for it first, make the door safe where we can, and confirm the return date in writing.

What should I do while I wait for a visit in Derry/Londonderry?

If the door is stuck part-open, keep people, pets and cars clear of it and switch off the power at the isolator if it is safe to reach. Do not force the curtain or open the roller box. Your Derry/Londonderry visit date is confirmed in writing.

Do you charge more for Derry/Londonderry than other towns in County Londonderry?

No. Guide prices are the same for Derry/Londonderry as for anywhere else we cover in County Londonderry. The written quote reflects your opening and the door you choose, not your postcode, apart from islands and remote areas where any travel cost is shown in advance.

Why does my roller door reverse when nothing is in the way?

A door that reverses on its own while closing is often reacting to a safety device that thinks there's an obstruction. Dirty or misaligned photocells, a damaged safety edge, a loose cable or limits that have drifted can all cause it. Clean the photocell lenses and check the beam is clear, then request a visit if it continues.

Can photocells be added to a door that doesn't have them?

Often, if the control box has a connection for them. Some older systems need extra wiring or a replacement control box first. Tell us what's on the control box label and we'll confirm whether photocells can be added, and the price, before booking. Our battery backup and safety upgrades page covers adding devices.