Bespoke design and build contractors in London. A reputable building company specialising in home refurbishment, converting roof space and extending peoples homes. In house site manager and contract manager means that we can design and build your dream house into reality. Our construction company has all the trades and craftsmanship necessary to complete your building project on time and hassle free. Customers may already has an architectural planning and only need a construction company that can follow the plan and build. Proficiency can help you to build by your supplied plans

Proficiency has been in the business since October 2011 and been specialist in bespoke loft conversions, home extensions and refurbishment work across London. Areas like Barnet, Finchley, north and south London.

Call Proficiency for free consultation.

Highlights, Specialties & Features

  • Loft conversions
  • House Extensions
  • Home Renovations
  • Design and Build
  • Basement

Professional Associations & Certifications

  • CheckA Trade

Serviced Areas

  • London, north london, south london, barnet, ficnhley, hamstead

Contact Details

  Person Jimmy Arra
  City Barnet
  Postcode NW2 2HN
  Address 663 Finchley Road, Barnet, London
  Phone Number 02074356231

Business Representative

Jimmy Arra


Products & Services

Attic Conversion

At Proficiency we are happy to provide a total service for all the loft conversions we perform in both South London and North London.

Your loft conversion job will begin with an on-site evaluation with one member of our design team that can help with all the elements of architectural illustrations and preparing planning application, however in case you currently have an architect you wish to deal with, we are more than happy to develop your loft according to their illustrations.

We will be with you till your loft conversion is completed.

DEVOTED project manager

From the very first day, you select us for your loft conversion, you will be presented to your project manager.

He will be your very first point of contact, he will handle the task together with you by keeping everybody linked and notify about what's occurring on the site. He will monitor and examine the development each week making certain it progresses as prepared.

https://www. proficiencyltd. co. uk/loft-conversions-london. html

  • I would recommend this business

We decided to go with Proficiency based on research I did for good builders on the internet. Proficiency was quick to respond and they setup a meeting to discuss the project. Being hesitant at first, we had several discussions and decided to see their work. Having visited their sites and talking to the owner, we decided to go ahead. The estimate was 5 months, and pleased to say they delivered bang on time. Their attention to detail is amazing and throughout the project the site was clean and tidy. The entire team is professional, on time and polite - and always had a smile on their face (perhaps the painter not so much, but he did a brilliant job :)). We never had any complaints from any residents. Jimmy (owner) has immense experience and helped and guided us throughout giving us ideas for the final touches. We have an amazing home, and couldn't have achieved it without their help.

Value for money
Service & support
Overall ratingExcellent

  • I would recommend this business

Fantastic builders who really care about the quality of finish. I have used them 3 times this year and each time the project came in on time and on budget

Value for money
Service & support
Overall ratingExcellent

Customer Testimonials

Great construction company. Project manager did a fantastic job at my home extension. Architect also did a great job. I was able to came to office and see my extension in live demonstration. Architect advised me what was possible to build and what not. At the same time while I was visiting their office I also had a chance to get a consultation about interior design. In overall pretty good building company.

When setting up my new offices for my overseas based location these guys were brilliant. Fast and prompt in everything they did and they did a great job


Construction Company In London | Design & Build Specialist

Proficiency is a Design & Build Construction Company In London that specialises in residential Loft Conversions, Extensions, Renovations and Basement Conversion projects.

Proficiency can work with any Property Renovation from kitchen renovation, bathroom installation and refurbishment to more complex single and double story extension and new builds.

If you are looking for construction company in London and to get the latest information on loft or basement conversions or get a Free No Obligation Quotation for your building project visit us at

Loft Conversion London | Proficiency

The typical expense of loft conversion in London is available in at in between 45,000 and 55,000 for a double bed room with its own bathroom. Although bear in mind that beginning costs for standard loft conversions start at around 40,000.

Please keep in mind that Proficiency quotes are offered entirely complimentary of charge and commitment-- we'll offer crystal clear insight into the expense without any dedication needed in your place.

Photo Book

Social Activity

Design and Build | Proficiency: via @YouTube
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Proficiency Latest Completed Project - Islington to see the full project visit our website
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Proficiency are a London-based loft conversion specialist, with the expertise and craftsmanship to bring your dream
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Types of house extensions: Loft conversions can bring a number of benefits to your home
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Looking to renovate your bathroom, be inspired by our project in North London. @ProficiencyLtd we can create the s
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From Our Website

For a decade, Proficiency has been leading the way in all aspects of luxury design and build. Whether you're looking to expand or refine your home with a loft conversion, rear or side extension, basement excavation, cellar conversion or a top to bottom refurbishment, our ethos is quality-first craftsmanship for the very best in residential design and build in London. For a decade, Proficiency's construction company has been working with homeowners across South, North London and the Home Counties to facilitate the construction work, interior design, loft conversions, renovation or expansion of their properties.

Established in 2011, Proficiency Design & Build specialises in renovations, extensions, basement and loft conversions in homes across London and the Home Counties. With offices in Finchley and Battersea we cover the whole capital and no matter whether you are looking to extend or refine, build up, down, out, or tear it down and start again, we have the design and build team to support you throughout the whole process. Our team is committed to building long-term relationships based on reliability, performance, value, and client satisfaction.

The process of building a house extension begins with an idea. You have to pick a team of builders in North London who have experience doing this type of project. Proficiency, a building company with years of experience and an in-house team can help you. A construction company can help you with different types of kitchen extensions and loft conversions. North London builders can add a relaxation room or entertaining place to your house. Building an extension can lead to increased property value.

Rear extension and loft conversion in Twickenham and full house renovation, build a large kitchen extension opening up the rear of the property. At Proficiency we're London design and build specialists because we do more than provide families with a little extra space we take every project and tailor it to our customer requirements. We are building and refurbishment experts, with years of experience delivering bespoke completed building project. When Mr and Mrs Forshew requested a home extension, loft conversion and full refurbishment from us, they couldn't have imagined how inclusive our process would be.

Whether you're looking at having building work done to your property and you live in South London then choosing a south London builder makes sound sense on many levels. Proficiency is based in Battersea and as local builder we have completed projects in Wimbledon, Wandsworth and Richmond. If you looking to convert your loft, add a new extension or renovate your property then Proficiency will be able to offer you a bespoke service that allows you more say in the design, as well as an outcome that more reflects your needs.

Proficiency Design & Build is one of London's finest luxury loft conversion specialists. With hundreds of exquisitely designed and impeccably finished loft conversions completed throughout the capital over the last decade, you can be sure that when it comes to innovation, craftsmanship and care, there are no better loft conversions in London than those created by Proficiency. If you're looking to extend upwards into your roof space to add an elegant new master bedroom with en suite, a light and airy art studio, a home office or a playroom for the kids.