
N4 Gas provides Gas Safe registered heating services across the Marble Arch, Marylebone and Bayswater areas — covering W1H, W1, W2, parts of NW1 and NW8. Boiler installation, repairs, annual servicing, CP12 landlord certificates and 24hr emergency cover.
The area around Marble Arch, Marylebone and Bayswater presents some of the most varied and demanding gas engineering work in London. The housing stock ranges from substantial Georgian and Victorian townhouses along the Marylebone streets and around Portman Square to the large mansion blocks of Bayswater and the densely converted Victorian properties of Paddington. We work across all of these property types — from a single-bedroom flat on Edgware Road to a large managed building behind Oxford Street.
This area also has a high concentration of managed properties, short-let apartments and mixed-use buildings — all of which have specific compliance requirements for gas safety. We work with private landlords, property management companies, managing agents and building management companies across W1H, W1 and W2 to ensure all properties are Gas Safe and CP12 compliant. Our engineers are DBS checked, Gas Safe registered, and experienced in the access arrangements and building management requirements common to larger central London properties.



New boilers, system replacements and upgrades across Marylebone, Bayswater and Paddington. Vaillant, Viessmann and Ideal — minimum 5-year guarantee. We understand the access constraints of central London properties.
Boiler installationFast boiler and heating repairs across W1H, W2 and surrounding postcodes. Same-day visits available. 12-month warranty on all repairs. We carry parts for all major brands.
Heating repairsManufacturer-specific annual services with signed service record issued same day. Protects your warranty. Free renewal reminders. Saturday slots available.
Boiler servicingAnnual gas safety inspections for Marble Arch and Marylebone landlords. We work with managing agents, block management companies and private landlords. Certificate same day.
CP12 certificatesBoiler breakdowns in central London properties don't wait for convenient times. Our on-call engineer covers the Marble Arch, Marylebone and Bayswater areas around the clock. Whether it's a boiler failure in a Marylebone townhouse or no heating in a Bayswater flat, call 0208 050 4729 — there's always someone available.
Emergency cover
W1, W1H & W2
Month warranty on
all repair work
Year guarantee on
every new boiler
Years of London
gas engineering
Call us on 0208 050 4729 — we cover all W1, W1H and W2 postcodes and can usually get to you quickly.