Gas Safety Certificate (CP12) Lewisham
Landlord CP12 certificates across Lewisham — digital copy emailed within 24 hours, original posted, annual reminders scheduled automatically.
Call 07456 975436Landline: 0207 046 1363 · Covering BR1, SE4, SE6, SE8, SE12–14, SE23
Gas Safety Certificate (CP12) across Lewisham
Booking a CP12 in Lewisham with us starts with a single phone call. An engineer — not a call centre — answers, takes the property address, tenant contact, and the list of gas appliances you know about, and either books a same-day slot if you call before 11am or the next available window. We cover every Lewisham postcode in BR1, SE4, SE6, SE8, SE12–14, SE23 and our engineers treat the neighbourhoods of Lewisham Town, Catford, Forest Hill as home turf. Pricing is fixed and published: £55-£75 single combi boiler in a flat; £75-£110 boiler plus hob; £110-£140 for three appliances; £140-£220 on licensed HMOs with multiple units tested individually.
Annual portfolio contracts for three or more properties start at £50 per property. What you get for the fee: the full Gas Safe inspection, tightness test, combustion analysis, safety device checks, flue integrity verification and working pressure measurement; the digital CP12 PDF emailed within 24 hours; the original posted first-class to the landlord address; an anniversary reminder eight weeks before the next expiry; and a free re-issue if the record is lost. Minor remedials — a sticking isolation valve, a loose flue seal, a perished sealing washer on a gas cooker bayonet — are usually sorted on the same visit so the certificate issues clean without a return call. Covering homes near the Horniman Museum, Sydenham Hill Woods, and Deptford Market.
Covering Lewisham — Lewisham Town, Catford, Forest Hill
Lewisham stretches from Deptford on the Thames south through Catford and Forest Hill, with a lively and diverse community living in a mix of Victorian houses and modern estates. Our engineers reach any Lewisham address within 30–45 minutes. For gas safety certificate work specifically, our engineers service every postcode in the borough — BR1, SE4, SE6, SE8, SE12–14, SE23 — at the same fixed pricing, with no neighbourhood loading and no out-of-hours premium for weekday or Saturday bookings. Covering homes near the Horniman Museum, Sydenham Hill Woods, and Deptford Market.
Gas Safety Certificate coverage across Lewisham Town and the surrounding BR1 streets.
Gas Safety Certificate coverage across Catford and the surrounding BR1 streets.
Gas Safety Certificate coverage across Forest Hill and the surrounding BR1 streets.
What Lewisham gas safety certificate covers
The full service breakdown. Every point below is standard on every Lewisham gas safety certificate booking we take — not upsells, not optional extras, not cost-extra items.
Tightness test against meter pressure
Every CP12 starts with locating the emergency control valve, confirming its operation, then tightness-testing the whole gas installation against meter pressure for the full statutory duration. Drop rates are recorded and any detectable leak is investigated before any appliance is fired up. This is the single most important safety step on a Gas Safety Certificate and cannot be skipped or shortened.
Electronic combustion analysis on every appliance
A calibrated flue gas analyser (Kane 458s or Anton Sprint, annual calibration certificate held in the van) is inserted into the flue sampling point on each appliance in turn. CO ppm, CO2 percentage and the CO/CO2 ratio are recorded against the manufacturer's benchmark figures. Readings outside tolerance trigger an investigation before the appliance is passed.
Flue integrity and spillage verification
Open-flued appliances are checked with a smoke match at the draught diverter to confirm proper spillage clearance. Room-sealed flues are inspected along the full horizontal or vertical run — concentric seals, terminal clearance from doors, windows and air bricks under the Gas Safe flue clearance rules, and any inspection hatch seals are checked for integrity.
Safety device function test
Flame supervision devices, overheat thermostats, pressure switches, oxy-pilot units on space heaters, and any fitted carbon monoxide alarms are each operated and confirmed working under fault conditions. A gas cooker with a failed FSD flows gas without a flame for four seconds before cut-off; that is tested and confirmed inside Gas Safe tolerance or the appliance fails the certificate.
Working pressure and gas rate measurement
Working gas pressure is measured at each appliance and compared against the appliance data badge. Where the meter allows, a gas rate is taken at the meter to confirm the correct input in kW against the appliance manufacturer's stated rate. Undergassing and overgassing are both common in older appliances and both classify the appliance At Risk under Gas Safe rules.
Full paperwork signed and issued same visit
The CP12 is completed on tablet before the engineer leaves, signed with their individual 7-digit Gas Safe ID number, and emailed immediately alongside a duplicate posted first-class to the landlord address. The format covers every field required under the 1998 Regulations plus the additional HMO declaration where applicable. Anniversary dates are preserved when renewals fall inside the two-month pre-expiry window.
Landlord portfolio scheduling
Landlords and managing agents with three or more properties are set up on an annual contract with consolidated monthly invoicing, a single named office contact, and an eight-week pre-expiry reminder calendar that prompts re-booking before the certificate lapses. Consolidated portfolio reports can be issued quarterly or annually for compliance files.
How a Lewisham gas safety certificate booking runs
Step-by-step process for every gas safety certificate visit across BR1, SE4, SE6, SE8, SE12–14, SE23. Consistent whether we are attending a single flat or a portfolio account.
Book a slot
Ring 07456 975436 or email the property address, tenant contact and list of appliances. Slots confirmed same call with a one-hour arrival window and a text confirmation the evening before.
Arrival and ID check
Engineer arrives inside the booked window with a photo Gas Safe ID card on lanyard, confirms the property address, and lists every gas appliance to be tested with the tenant or agent on site.
Tightness test
Emergency control valve operation confirmed. Full tightness test carried out against meter pressure for the statutory duration. Any drop is investigated before appliance testing begins.
Appliance inspection
Visual check of each appliance casing, seals, flue, ventilation, isolation valve and flexible hose. Make, model, GC number and serial recorded for the certificate paperwork.
Combustion and pressure testing
Calibrated electronic analyser reads CO, CO2 and CO/CO2 ratio against benchmark. Working pressure measured at the appliance. Gas rate taken at the meter where possible. Safety devices operated and confirmed.
Flue spillage and safety device check
Spillage test on open-flued appliances with smoke match. Full flue run inspected on room-sealed appliances. FSD, overheat, PRV and any CO alarm all verified.
Certificate issued
CP12 completed on tablet, signed with engineer's 7-digit Gas Safe ID, digital PDF emailed immediately, original posted first-class, anniversary date logged for automatic eight-week reminder.
Gas Safety Certificate pricing in Lewisham
Identical to our London-wide published pricing. No BR1 loading, no Lewisham surcharge. Quote on the phone matches the invoice.
Full breakdown on the pricing page or the main Gas Safety Certificate London page.
Why choose us for Lewisham gas safety certificate
We run the Gas Safety Certificate side of our business as a proper engineering service, not a paperwork shop. Every engineer attending a Lewisham CP12 carries a photo Gas Safe ID, a calibrated electronic flue gas analyser (annual calibration certificate in the van), a full set of pressure gauges, a tightness-test kit, smoke matches for open-flued spillage tests and van-stocked spares for the minor remedials that commonly stop a clean pass — flue seals, isolation valves, gas cooker bayonets, boiler electrodes and pressure relief washers. That means roughly seven in ten Lewisham visits that would otherwise fail on a small defect issue a clean certificate on the same visit without needing a return trip.
Our office side keeps a digital copy of every CP12 we have issued indexed by property address, engineer, and expiry date, so a lost certificate is re-sent inside five minutes of a phone call at no charge.
Gas Safety Certificate Lewisham — FAQ
Borough-specific questions plus the general gas safety certificate questions we get asked most often.
How quickly can you attend a Gas Safety Certificate booking in Lewisham?
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We cover every Lewisham postcode in BR1, SE4, SE6, SE8, SE12–14, SE23 with same-day bookings if you ring before 11am, and next-day bookings as standard. Typical arrival window is a one-hour slot, confirmed by text the evening before with a live ETA sent 30 minutes out. Response times across South-East London run 30-45 minutes from the nearest depot for urgent call-outs; standard CP12 bookings are scheduled into a booked slot rather than dispatched as emergencies.
Do you cover Lewisham Town and the surrounding streets?
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Yes. Lewisham Town, Catford and Forest Hill are all within our standard coverage area across Lewisham. Covering homes near the Horniman Museum, Sydenham Hill Woods, and Deptford Market. Every postcode in the borough — BR1, SE4, SE6, SE8, SE12–14, SE23 — is serviced at the same fixed pricing with no neighbourhood loading. Annual landlord portfolio contracts work across the full coverage area so a single property manager with flats in several of these neighbourhoods is invoiced against one consolidated account.
What's the typical CP12 cost in Lewisham?
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Fixed pricing applies across South-East London: £55-£75 for a single combi boiler in a Lewisham flat, £75-£110 for a boiler plus hob, £110-£140 for three appliances, and £140-£220 for a licensed HMO with multiple boilers or water heaters. Landlords running three or more Lewisham properties on an annual contract pay from £50 per property with consolidated monthly invoicing. No postcode loading applies within BR1, SE4, SE6, SE8, SE12–14, SE23.
Does the CP12 cover gas cookers, hobs and fires?
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Yes. Every gas appliance installed by the landlord is covered — boilers, cookers, hobs, gas fires, back boilers and water heaters. Appliances owned by the tenant (portable heaters, a tenant-supplied cooker) are not strictly within scope, but the engineer will still test the connection, isolation valve and bayonet fitting and note the appliance on the certificate for completeness.
What if my property fails the CP12?
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The engineer issues a Warning Notice with the correct Gas Safe classification (At Risk, Immediately Dangerous, or Not To Current Standards), labels the appliance, and provides a fixed-price quote for the remedial work before any further work begins. In roughly seven out of ten failures the fix is completed the same day from van-stocked parts so the certificate issues clean without a return visit.
What's the difference between a CP12 and a boiler service?
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A CP12 is a safety check — the engineer verifies each gas appliance is operating safely against manufacturer and Gas Safe tolerances. A boiler service is a maintenance visit — cleaning the heat exchanger, replacing sealing washers, checking the expansion vessel and condensate trap. Most landlords book the two together because combining them usually saves £40-£60 per visit compared with two separate call-outs.
How long is a CP12 Gas Safety Certificate valid for?
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Twelve months from the date of issue. Under Regulation 36 of the Gas Safety (Installation and Use) Regulations 1998, every gas appliance, fitting and flue in a rented property must be checked for safety within twelve months of the last certificate. The renewal can be carried out up to two months before expiry and the original anniversary date is preserved, so you do not lose days off the annual cycle.
Can I book a CP12 if access is tenant-dependent?
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Yes. Our office handles the access scheduling — two reminder calls to the tenant, a text confirmation the evening before, and a documented record of all attempts. If the tenant refuses access we issue a headed letter of attempted access for the landlord's legal file, which matters if the matter later escalates to a court order. Regulation 36 expects reasonable attempts, not guaranteed access.
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Book gas safety certificate in Lewisham
An engineer — not a call centre — answers the phone, takes the property address, and books the next available slot across BR1, SE4, SE6, SE8, SE12–14, SE23.
Call 07456 975436Landline: 0207 046 1363