All Building work

Single Storey| Double Storey Extensions

Loft conversions

JW Construction manage every aspect of every loft conversion from submitting of plans right through to completion of all finishing trades, leaving the completed conversion ready for decorating. At every stage we consult with client on progress and seek approval of choice of fittings, windows/doors/spindles etc. to match existing.

At JW Construction we operate a weekly payment structure which runs for the duration of the project with the first payment only due after the first full week on site. This system ensures that we only ever request payments for work that has already been carried out.

For the duration of construction you will be assigned a dedicated installation team. This team will not leave site until construction complete. We only ever use timeserved tradesmen for each individual trade. All electrical work undertaken comes with NIC certification.

All projects include all required scaffolding, skip hire and an outdoor contractors toilet. 90% of all building materials required for our loft conversions are mechanically lifted onto the scaffolding and enter the property through the roof, any debris leaves the property the same way and is removed from site. We only enter the existing area of the house towards the end of the project when the stairs are to be installed, at this stage will take every precaution to minimise disruption to the normal life of the occupants. A carpet protection system is laid to all necessary areas.

Pitched roofing 

So, the roof on your home is mis-behaving, the flashings around your chimney have perished, a couple of ridge tiles have fallen off, the rest are looking in very bad shape. When the ridge tiles fell off they damaged a few Slates/Tiles on the way down, some are split, some cracked and others have just fallen into the gutter. The breathable membrane under your tiles is now non-existent and the condensation is building up in your roof space which is not ventilated or insulated. The Bay window has started leaking and left nasty water marks on the ceiling in your front room, as has the velux window on your flat roof extension and the felt was damaged in the last storm and you’re concerned that it won’t make it through another winter.

All the above problems and many more are what we deal with every day. If your roof has not had much in the way of TLC over the last 10 years then the chances are these issues will soon present themselves.

We have over 30 skilled and experienced operatives that cover all aspects of roofing for your home, our directors were roofers themselves as boys and took over their father business, so you can be rest assured that we know what we are talking about.

Please contact us for your free quotation for repair works, refurbishments or new extensions and we will give you options to suit your requirements.

Flat to pitched roofing

If you have an old flat roof that suffers from ponding water, you may find that flat to pitched roofing could be the answer.

In a flat to pitched roof conversion, a new lightweight steel sub frame is built over the existing roof and then over-clad. They are assembled at roof level, and because they’re lightweight, there’s only limited increased weight on the building structure.

The new pitched roof allows rainwater to drain from the area completely that reduces the potential for future water ingress. Each system is bespoke, designed to suit the existing structure.

We’ve installed Flat to Pitched roof conversions for many years and for clients in many sectors. We’ll provide a thorough specification and clear quotation, and where possible we will look to provide fresh and innovative ideas about how best to carry out the work. As leading roofing refurbishment contractors, we’ll always ensure that our recommendations fit your budget and meet your long-term needs.


JW Construction offer a full range of quality workmanship from and including all aspects of building work be it New builds, Extensions, Repairs, Property maintenance, Insurance work, Roofing, Flat roofs, Fascia and soffits, Brickwork, Plumbing and more.

JW Construction is a local family building company based in Garstang, Preston in Lancashire, run by Justin Waterhouse a fully time served joiner. Justin started his working life straight from school where he served his apprenticeship with Fern Joiners in Clitheroe. Once he had completed his apprenticeship he went on to gain an ordinary and higher National Certificate in Building Studies at Accrington College. Justin then left and set up on his own in 2001, “I always wanted to run my own company and provide a proper professional building service”.

The company has grown steadily Justin surveys each and every job himself and provides comprehensive written quotations for all jobs, “we tackle all kinds of jobs, and we have built one off houses for clients from scratch from an initial idea right up to completion”

“We can take care of planning and the building control process, meaning that we really do provide The Complete Building Service“.


JW Construction is the product of 20 years of hard work and dedication. Our business has been built on consistent performance and unrelenting attention to detail so vital when building custom homes. We are committed to maintain the highest level of craftsmanship through years of experience, knowledge and the will to supersede the expectations of our clients. Through solid, honest construction, our goal is to produce aesthetically beautiful homes, while maintaining innovative functional living spaces. Each home offers a unique style combined with exceptional workmanship to offer true individuality inherent to each of our clients. Not limited by size or style, We offer a wide variety of floor plans with endless amenities to fit every wish and budget.

Communication is the key to a successful project. Our philosophy with our business is to establish a great client-builder relationship. This ensures a deeper level of understanding that allows us to accurately build homes through our customer’s visions and dreams. It is our mission and purpose at JW Construction. to provide the highest degree of honesty and integrity to provide the finest quality homes for our patrons.

Get a Free Quote
  • Roofing
  • Joinery
  • UPVC Windows and Doors
  • Extensions
  • Orangeries / Conservatories
  • Full and Part House Renovations
  • Loft Conversions
  • Drainage
  • Repair and Maintenance
"Having decided to go ahead with a dormer loft conversion and getting several builders round, JW Construction was the one that stood out to me the most and i was not to be disappointed. Justin designed and got my plans drawn up for the full conversion,which even included steel calculation. The work completed can only be described as exceptional and are an extremely honest and trust worthy company to the fact i handed them the keys to my property. Along the way Justin kept me updated on each stage of the build which puts you at ease. They cleaned up at the end of everyday and even put plastic down to keep the carpets clean. They were quite few added extras along the way which Justin completed for me without any issues and kept the price down to a minimum. I would recommend JW Construction to anyone and if anyone wants to see his work they can contact him and are free to look at the work completed. I would like to say a massive thank you to Justin and his team for a quality job!"
JW Construction Trusted Trader

Adrian Cawtherley

12th March 2017
"Justin came highly recommended and proved to be absolutely 100% Honest, reassuringly knowledgeable, committed, friendly,punctual, devoted to the job, and completely organised. (ie....hardly ever on his phone,almost no breaks,or annoying unnecessary trivial trips to suppliers for forgotten materials or tools) etc....The supplier at my local plastic suppliers even commented on Justin as ' one of only a couple of roofers he would be glad to recommend ' ...' 30 years of roofing, and qualified to passing his own work to building inspectors regulations'! Top quality service on a single storey pitched roof with velux, including soffit, facia and guttering......very professional. ..highly recommendable...."
JW Construction Trusted Trader

Gary Shaw

28th January 2017