Home Extension Builders in City of London
Expert extension specialists serving The City of London and the EC1, EC2, EC3 area, delivering full extension design, build, and finish with Buildaway.
Your Local Home Extension
Specialists in The City of London
Extension builders covering The City of London and the surrounding EC1 streets: Buildaway works around Guildhall, the Barbican Estate and the roads off Fleet Street.
The City of London rewards extending, but two things need settling early. Drainage often crosses the rear garden, and a build-over agreement takes weeks that belong at the start of a project. The second is City of London conservation areas, extensive listed building consent and strict working-hours rules, where volume limits are applied more tightly. Buildaway resolves both before design is committed. Buildaway handles extension projects throughout EC1, EC2, EC3, from Smithfield Market and Cheapside to the homes closest to Bank junction.
Homeowners across The City of London choose Buildaway for extensions that add lasting value. Our workmanship, clear pricing, and coordinated project management mean a EC1 extension delivered on programme and finished to a standard that stands up to scrutiny.
Our Home Extension Packages in The City of London
Single-Storey Rear Extension
Ideal for expanding your living space. Includes structural survey, architectural drawings, groundworks and foundations, brickwork and roofing, bi-fold or sliding doors, heating installation, building regulation approval.
Side Return Extension (Most Popular)
Complete kitchen and living area transformation. Includes structural assessment, full groundworks, steelwork if required, brickwork and matching materials, glazing and doors, full insulation, electrics upgrade, flooring, building regulation approval, waste removal.
Double-Storey Extension
For those seeking maximum space addition. Includes architectural design, full structural alterations, steelwork and foundations, bespoke staircase, multiple room creation, bathroom or en-suite option, planning and building regulation handling.
Why City of London Homeowners Choose Buildaway
Local teams trusted across the City, Tower Hill, Farringdon, Liverpool Street, and EC postcodes
Based in your area with local expertise and reputation.
Bespoke extension designs for luxury apartments, penthomes, and prime residential developments
We handle everything so you don't have to worry.
Transparent and honest pricing with no hidden fees or unexpected charges.
Clear upfront pricing with no surprises along the way.
Full project management for a seamless, stress-free experience
Meticulous craftsmanship in every aspect of your extension.
Completed projects near Bank, St Paul's, Moorgate, and prime City addresses
Professional consultation and detailed quotes at no cost.
What's Included in Your Home Extensions Services
Everything you need for a seamless, stress-free home extension - from structure to finish.
Full groundworks and structural build
Complete groundwork preparation and structural construction services.
Plumbing, electrics, and heating integration
Professional installation of all mechanical and electrical systems.
Roofing, windows, and external finish
Complete roofing, window installation and exterior finishing.
Plastering, flooring, and decorating
Professional plastering, flooring and decorating services.
Interior fit-out and finishing
Complete interior fit-out and professional finishing touches.
Project management and schedule control
Professional project management and timeline control throughout.
What Our Clients Say
Real reviews from our satisfied customers.
“The first time I met Cormac, I knew that he is a professional, everything explained in detail ... In the end, he didn't let me down. I was very impressed with his work.”
Seow Khor
Verified Google review
“In half an hour he was at the door ... he listened and then checked, measured and said to me it is doable. Cormac is very good with communication, listening, advising, a hard worker and an excellent team leader. I am extremely impressed, happy and proud of what his team delivered.”
Betty Lwanga
Verified Google review
“Communication was clear and consistent both before and throughout the project, which made the whole process feel well managed ... The quality of the finish is excellent ... They stuck to the agreed timelines, and pricing was transparent throughout.”
Sean Kelleher
Verified Google review
“From my first contact with Cormac, I was in good hands. His team turned my vision into reality, communicating with me every step of the way and offered helpful suggestions which turned my bathroom into an oasis. I could not be happier and would highly recommend their services.”
Jackie Brown
Verified Google review
“From start to finish the experience was smooth and well organised. Cormac was easy to deal with, communication was clear and everything ran to the agreed timelines ... The quality of the finish is excellent. The bathroom looks fantastic and the bedrooms feel completely refreshed.”
Helen Sivyer
Verified Google review
“We had an excellent experience working with Buildaway. Cormac was incredibly easy to work with, and gave helpful advice. The finished job was neat, professional and completed efficiently. We'd definitely recommend and would use them again!”
Roisin Lawrence
Verified Google review
Frequently Asked Questions
Your questions about home extensions in The City of London, answered.
What is a build-over agreement and will I need one?
If the extension crosses a public sewer you need written consent from the water authority before building over it. It is common in The City of London because of how rear drainage runs. The application takes several weeks, so Buildaway starts it at design stage rather than letting it delay the build.
Will an extension affect my neighbour?
On any semi-detached or terraced The City of London property the Party Wall Act applies and notice must be served. Buildaway handles the notices and statutory periods, and factors them into the start date rather than discovering them mid-project.
Can I stay in the house during the build?
Usually yes for a single-storey rear extension, since the existing structure stays sealed until late in the programme. Buildaway phases the The City of London work so the opening-up happens over the shortest practical period.
How long does a rear extension take to build?
A single-storey rear extension is generally ten to fourteen weeks on site once foundations start, depending on glazing lead times. Double-storey work runs longer. Buildaway separates the design and consent period from the build period on the programme so expectations are realistic.
Can you extend within City of London conservation areas?
Sometimes, but the tests are stricter and additions are assessed against the original dwelling rather than its current size. Buildaway will tell you honestly at survey stage whether a scheme is likely to succeed before you spend money on drawings.
Get Your Free Quote
Tell us about your project and we'll get back to you within 24 hours.
We Serve The City of London and Surrounding Areas
Based locally and working across The City of London and the neighbouring EC1 streets every week.
Nearby Areas We Serve
Below are some of the local areas where you can find Buildaway transforming homes.
Ready to Transform Your Extension in City of London?
We’ve transformed extensions in family homes, apartments, and bungalows across City of London, always delivering quality, style, and lasting results.