Limited Offer: New A-rated Boiler Installed from £1,950 — 10-yr warranty included Claim Now HomeAboutServices Areas We Cover Our WorkReviewsContact 020 3432 234907377 788881 Request Estimate - Home - svg]:size-3.5 text-steel"> - Services - svg]:size-3.5 text-steel"> - Landlord Gas Safety Certificate (CP12) Landlord Gas Safety Certificate (CP12) # Gas Safety Certificates in Bethnal Green & East London Stay legally compliant with annual landlord gas safety inspections. CP12 certificates from £79.99, issued same-day by Gas Safe registered engineers. Multi-property discounts available. Book Your CP12 Today07377 788881 ★ CP12 from £79.99 · Gas Safe registered · Same-day certificates · 1,000+ issued Last updated: 29 April 2026 £79.99 From Same Day Certificate Issue 12 Months Validity Gas Safe Registered 1,000+ Issued ## What Is a Gas Safety Certificate (CP12) & Who Needs One? A Landlord Gas Safety Certificate — formally known as a CP12 or Landlord Gas Safety Record — is a legal document confirming that all gas appliances, pipework and flues in a rental property have been safety-checked by a Gas Safe registered engineer within the last 12 months. Under the Gas Safety (Installation and Use) Regulations 1998, every landlord in the UK must provide a valid CP12 to every tenant within 28 days of the inspection (or before they move in for new tenancies). The certificate must be renewed annually. Failure to comply carries unlimited fines and, in cases of injury or death, criminal prosecution under the Health and Safety at Work Act. MAMOSS issues CP12 certificates across Bethnal Green and East London from £79.99 for a single-appliance property, with same-day digital certificates emailed to you and your tenant. We are Gas Safe registered (engineers carry ID — always ask to see it), carry calibrated equipment for every test, and offer significant discounts to landlords with multiple properties. - Tightness test on the gas supply pipework - Standing and working gas pressure check at every appliance - Burner pressure or gas rate against manufacturer specification - Combustion analysis (flue gas readings) - Visual inspection of flue and ventilation - Safety device testing (flame supervision, ODS) - Visual check of pipework for damage and corrosion - Digital CP12 certificate emailed same-day ## The Real Cost of an Out-of-Date CP12 Operating a rental property with an expired or missing CP12 is one of the most heavily enforced landlord obligations in the UK. The consequences extend well beyond a fine: ### Unlimited Fines Fines for breaches of the Gas Safety Regulations are unlimited under criminal court sentencing guidelines. Typical fines range from £6,000-£25,000 per breach, with worse cases reaching six figures. ### Criminal Prosecution If a tenant suffers injury or carbon monoxide poisoning in a property without a valid CP12, the landlord can be prosecuted under the Health and Safety at Work Act — potentially leading to a custodial sentence. ### Voided Insurance Landlord insurance policies universally require a current CP12. Any fire, gas or CO incident in a non-compliant property will result in the claim being refused — leaving you personally liable for damage and injury. ### Section 21 Blocked You cannot serve a valid Section 21 (no-fault) eviction notice on a property without an in-date CP12. Eviction proceedings will be ruled invalid by the court. ### Tenant Compensation Claims Tenants who can prove they were not provided with a valid CP12 may claim compensation through the courts — and success rates are high. Some tenants now actively check certificate dates as part of their rights. ### Carbon Monoxide Risk The CP12 inspection includes flue gas analysis — the only reliable way to detect a boiler producing dangerous levels of carbon monoxide. Skipping it is gambling with your tenant's life. Our Process ## What Happens During a MAMOSS CP12 Inspection 1 ### Tenant Liaison & Access We coordinate access directly with your tenant (or letting agent) at a time that works for them. Calibrated equipment and ID are carried — your tenant can verify our Gas Safe registration on the spot. 2 ### Tightness Test We perform a manometer tightness test on the gas supply pipework to confirm there are no leaks anywhere in the property's gas installation. This is the single most important safety check on every CP12. 3 ### Appliance-by-Appliance Inspection Every gas appliance — boiler, hob, fire, water heater — is individually checked: standing pressure, working pressure, burner pressure, flue gas analysis, flame supervision, ventilation adequacy, and visual condition. 4 ### Flue & Ventilation Check We inspect every flue (including concealed flues where access permits), visually check terminations, and verify adequate room ventilation. CO alarms in habitable rooms with gas appliances are checked. 5 ### Documentation & Coding Any defects are coded as Immediately Dangerous (ID), At Risk (AR) or Not to Current Standards (NCS). ID and AR appliances are disconnected with the tenant's consent and you are notified immediately. 6 ### Certificate Issued The CP12 certificate is issued digitally on the day, emailed to you and to the tenant. We diary your renewal date 12 months later and send you a reminder a month in advance. ## Why Landlords Choose MAMOSS for Their CP12s ### Lowest Compliant Price From £79.99 for a single-appliance property — among the lowest fully Gas Safe compliant prices in East London. No 'admin fee' or 'callout charge' surprises. ### Same-Day Certificate Digital CP12 emailed within hours of inspection. No waiting weeks for paperwork. Forward straight to your tenant or letting agent. ### Tenant Coordination We deal with the tenant directly to arrange access — saving you the hassle. Polite, professional engineers who respect the tenant's home. ### Multi-Property Discounts Portfolio landlords get discounted rates and coordinated scheduling. Some landlords have us inspect 20+ properties in a single batch — significant savings on the unit price. ### Annual Reminder Service We diary your renewal date and send a reminder a month before expiry — so you never accidentally let a CP12 lapse. ### Combined Boiler Service Discount Add an annual boiler service to the CP12 visit and save £20 on the combined price. Keeps the boiler warranty valid and your CP12 done in one visit. ## Gas Safety Certificates in Detail: Pricing, Coverage & Codes Our CP12 pricing is structured by the number of gas appliances in the property. Single-appliance properties (boiler only) start at £79.99. Two appliances (boiler + gas hob) is £89.99. Three appliances £99.99. Each additional appliance £15. Combined CP12 + annual boiler service is £99 — saving £20 versus booking separately. Multi-property landlords get tiered discounts: 5+ properties 10% off, 10+ properties 15% off, 20+ properties bespoke quote. We coordinate tenant access across the whole portfolio in a single scheduling exercise and issue all certificates simultaneously for tax-period record-keeping. Defect coding follows the Gas Industry Unsafe Situations Procedure (GIUSP). Immediately Dangerous (ID) means a real and present risk — the appliance must be disconnected on the spot (with tenant consent — refusal is reported to the Gas Safe Register). At Risk (AR) means a defect that creates risk under foreseeable conditions — disconnect recommended. Not to Current Standards (NCS) is advisory only and does not affect the CP12 outcome. Common findings in East London properties include: blocked or partially obstructed flue terminals (especially where extensions have been built), inadequate ventilation in modernised kitchens (extractor hoods replacing wall vents), corroded supply pipework in older installations, and missing CO alarms in habitable rooms with gas appliances (a legal requirement since 2022). We also provide CP12s for HMO properties (per-unit pricing), commercial gas safety inspections (CP15, CP17), catering equipment certificates (CP42) and gas warning notice issuance. Whatever the gas safety paperwork, MAMOSS handles it. - 1 appliance (boiler only) — £79.99 - 2 appliances (boiler + hob) — £89.99 - 3 appliances — £99.99 - CP12 + annual boiler service — £99 (save £20) - Multi-property landlord rates — up to 15% off - HMO per-unit pricing available - Commercial CP15/CP17 quotes on enquiry - Same-day digital certificate to landlord and tenantExplore more of our services: Home•Gas & Heating•Plumbing Services•Electrical Services•Emergency Plumber•Areas We Cover•Get a Free Estimate FAQ ## Frequently Asked Questions ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">How much is a Gas Safety Certificate (CP12)? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">How often does a CP12 need to be renewed? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">How long does a CP12 inspection take? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">Do I need to be present for the inspection? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">What if my property fails the gas safety check? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">Do you do CP12 for HMO properties? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">Can I get a CP12 and boiler service at the same time? ### svg]:rotate-180 text-sm font-semibold text-surface-dark-foreground hover:no-underline py-4" data-radix-collection-item="">Do you cover Hackney, Shoreditch and Stratford? Part of Gas Engineer →See all gas engineer services we provide. ### Related Reading & Guides Boiler ServiceCombine with annual service from £99 (save £20). Gas Cooker InstallationGas Safe cooker connection and certification. Boiler RepairSame-day repair if your CP12 inspection finds a fault. ### Available Across London Bethnal GreenShoreditchHackneyStratfordHoxtonEast LondonAll Areas → ## Ready to Solve Your Property Problem? Speak to a qualified engineer today. No obligation estimates, transparent pricing, and rapid response across London. Request a Free Estimate07377 788881 Multi-trade property services across London. Gas Safe registered, CHAS accredited, fully insured. 07377 788881 info@mamoss.co.ukUnit C, 279 Bethnal Green Road, London E2 6AH ### Services - Central Heating Service - Plumber - Electrician - Gas Engineer - Boiler Supplier - Drainage Service - Bathroom Renovator ### Areas - Bethnal Green - Shoreditch - Hackney - Stratford - Hoxton - East London ### Guides - Boiler installation cost London - Combi vs system boiler - How long does a boiler install take? - What to do if a pipe bursts - How to turn off your water (UK) ### Company - About Us - Our Work - Reviews - Special Offers - Contact ### Accreditations - Gas Safe Registered ↗ - CHAS Accredited ↗ - Safe Contractor ↗ - Constructionline ↗ - CIPHE Member ↗ © 2026 MAMOSS Ltd. Company No. 16372778. All rights reserved. Privacy PolicyTerms & ConditionsCookie PolicySitemap Call NowFree Estimate We use essential cookies to run this site and optional analytics cookies to improve it. Cookie Policy AcceptReject