House Extension Costs in London: A Practical Pricing Guide
A straightforward guide to what house extensions actually cost in Wembley, Harrow, Brent and nearby London areas — …
Read articleFamily-run builders · North & West London · Since 2007
Extensions, loft conversions and complete refurbishments, including the kitchens, bathrooms, plumbing, heating and electrics.
“We hired Mirion to remodel our new four-bedroom home, and he did a fantastic job on schedule and on budget, despite the fact that there were a lot of unknowns and bad weather!”
Emma NFour-bedroom home remodelRecent projects
Member of the Federation of Master Builders, whose members are vetted and inspected.
Projects we take on
We focus on extensions, loft conversions and complete refurbishments. On an extension or loft, most of the work happens outside the house and we connect the new space at the end.
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More room to cook, eat and live. We build most of an extension from outside, then open up and connect it to the house at the end.
A new bedroom, bathroom or office in the roof. Most of the work happens from outside, and the new floor is connected to the house at the end.
Complete refurbishments of houses and flats, and conversions such as a house converted for multiple occupancy.
Service images are illustrative, not specific Mirion projects.
Every trade the job needs
Kitchens, bathrooms, plumbing, heating and electrics are part of most of our projects, so you do not have to find and coordinate separate trades.
Planning, fitting, plumbing and electrics for a new kitchen, often inside a new extension.
Bathrooms and en-suites, including new ones in a loft conversion.
New boilers, heating and hot water as part of the project. Mirion is Gas Safe registered.
Drawings and design through the architects and engineers we work with.
New wiring, sockets and lighting, planned with the rest of the work.
Planning a larger project?
Talk it throughNeed only a small job, such as a boiler repair? We usually put you in touch with one of the partners we work with.
Client voice
What clients said about working with Miri and the Mirion team.
Read the full client stories“He came in, had a look, and soon submitted a pricing. The crew was pleasant to deal with and professional. Miri is a straight shooter who tells it like it is, and he is great at coordinating and monitoring the entire project!”
Laura ORenovation, London“I’d never done any kind of renovation before, so entirely renovating a two-bedroom flat was intimidating. … Everything was completed on time, on budget, and with clear communication throughout.”
Richard JFlat renovation, LondonHow a project runs
Every project starts with a conversation about the property and what you want to change.
Start a conversationWe look at the property and talk through what you want to change. If you need drawings, we work with architects and engineers who can prepare them.
We talk through the planning and Building Regulations approvals the work is likely to need. You get a written quote and a written contract before work starts.
We manage the structure, plumbing, heating, electrics, kitchens and bathrooms through to the finishes. On extensions and lofts, the new space is connected to the house at the end.
We finish the details and hand the work over. Extensions and loft conversions come with a 10-year warranty from Mirion.
Evidence, not slogans
Mirion was founded by Fatmir (Miri) Vlada in 2007. He entered the building industry in 1989 and remains involved in the work.
Read the full storyGood work is always collaborative. In 2017 Mirion formed partnerships with LEO Gas Inspection and Link Steel Fixing to increase capacity.
Where we work
We are based in Wembley. Not sure whether we cover your area? Send the postcode with your enquiry and we will tell you.
All areas we coverQuestions homeowners ask
Still unsure? Call 07916 160893 or send a few details.
Mainly larger projects: home extensions, loft conversions and complete refurbishments, including conversions such as a house converted for multiple occupancy. Kitchens, bathrooms, plumbing and heating and electrics are usually part of those projects. We also offer surveys, design, driveways and property consultations: see all services.
Our focus is larger projects. For a small standalone job, such as a boiler repair, we usually put you in touch with one of the partners we work with.
We are based in Wembley and work across North and West London. Areas we have worked in include Hampstead, Highgate, Muswell Hill, St John's Wood, Maida Vale, Notting Hill, Kensington, Chiswick, Richmond and Kew, as well as Ealing, Barnet, Harrow, Brent and Hillingdon. If you are not sure whether your property is close enough, include the postcode when you get in touch.
Most of the work on an extension or loft conversion is done from outside the existing house. We open up and connect the new space towards the end, so the disruption inside your home is kept as short as possible. We talk through what to expect before work starts.
Yes. Every project has a written contract. We usually use our own, and can use the Federation of Master Builders' domestic building contract if you prefer. We are fully insured, including public liability insurance, and extensions and loft conversions come with a 10-year warranty from Mirion.
No. A few lines about the property and what you want to change is enough to start. If you already have drawings, planning permission or a survey, include them: they help us price the work. If you need drawings, we work with architects and engineers who can prepare them.
It depends on the size and scope of the work, the condition of the property, design and material choices, access and any approvals needed. We talk through the scope before pricing the work, rather than relying on a one-size-fits-all figure.
It depends on the property and what you want to build. Some extensions and loft conversions can go ahead under permitted development rights; others need planning permission, for example in a conservation area. Building Regulations approval is usually needed as well. We talk through the approvals your project is likely to need, and the Planning Portal explains the national rules.
We read what you have sent in context and look at the work you are describing. Then we agree the next step with you: that might be a call, a survey or a clearer scope for the work. If it is easier to talk, call 07916 160893.
From the blog
Practical notes on homes, property and the decisions that come before the work starts.
Read the blog
A straightforward guide to what house extensions actually cost in Wembley, Harrow, Brent and nearby London areas — …
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The three main types of loft conversion explained — what each one involves, how much space you gain …
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When your boiler breaks down, should you repair it or invest in a new one? A practical guide …
Read articlePlanning a larger project?
Send a few details and we will start with the right questions. It helps to include: