The Loft Conversion & Extensions Specialists


Walthamstow’s leading loft conversion, extensions and house building contractors serving clients within Walthamstow and the surrounding areas


Loft Conversions

Whether it’s adding a bedroom or a bathroom we have you covered

Kitchen Extensions

Are you looking for that dream kitchen in a new larger space?

Home Refurbishment

We are also refurbishment specialists, giving life to tired spaces.


Weather damage or new roofs we offer all kinds of roof services.


Need a new garden wall or some brickwork repairs? Contact us.

& Much More

Foundation work, Groundworks, Steel works and much more.

About Us

Formed in 2016, WJ Construction Ltd is an established company of building contractors offering loft conversions & extensions. With 12 years of valuable trade and industry experience, we offer services to domestic customers in Walthamstow and in all surrounding East London areas. These services place a strong focus on loft conversions and extensions for expanding existing living space.

Our team optimises interior and exterior space by building house extensions, kitchen extensions and loft conversions, all of which transform the way you live. Harlow, Chingford and Walthamstow are key service areas for our trained and accredited tradesmen, but we also welcome enquiries from all other parts of North and East London.

There is a level of communication with WJ Construction that’s hard to find with many building contractors, and a quality of workmanship to match. We’re here to help with all issues related to building work, and to provide the customer with house refurbishments and renovations that include repair work for fire, flood and water damage.

Prospective customers in Harlow and the surrounding areas can contact us on 01279 276227 to arrange a personal visit and an obligation-free quotation.

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WJ Construction is a proud member of the Federation of Master Builders and has an excellent rating on Checkatrade. We offer a full 10-year guarantee of house extensions and kitchen extensions, and an equivalent warranty on loft conversions. Our building contractors work to an agreed specification, to set timescales, and always inside a predetermined budget.

All personnel at WJ Construction carry CSCS cards and have minimum City & Guilds qualifications for their respective trades.

We always work professionally, with a customer-focused outlook, and maintain good Health & Safety practices onsite. By minimising disruption and keeping the workplace tidy, our building contractors make builds and house refurbishments an easier proposition for homeowners in Harlow, Chingford, Walthamstow and all surrounding locations.

  • Revive living space with house refurbishments tailored to your needs
  • Optimise available space with house extensions and loft conversions
  • Realise your design aspirations with bespoke kitchen extensions
  • Protect your home from weather damage with our roofing services
  • Redefine your landscaping theme with garden brickwork constructions

WJ Construction supports its services with full public liability cover and supplies a skilled workforce to your project with experience across multiple trades.

We have a checkatrade rating of 9.83

Giving our customers the piece of mind that we will always get the job done!

Client Testimonials

“The guys were polite and efficient, did a really professional job. A real pleasure to have WJ construction completing the work.”

Customer in Walthamstow

Loft Conversion

“Warren managed the project very effectively. The work started on time every day, the team were hard working and polite, and the site was always left tidy. The work was completed on time and on budget and any snags were dealt with promptly, and Warren always answered questions promptly and clearly. We are delighted with the end product and are more than happy to recommend WSJ.”

Customer in Ware

Loft Extension

“A single story extension that we love, the standard of work was exceptional and was completed really quickly with minimum disruption to the rest of our home. I would highly recommend this company.”

Customer in Enfield

Kitchen Extension

Contact Us

More Information

37 Silvesters, Harlow, Essex, CM19 5NN

01279 276227