Fully qualified and trained at working at heights, our tradesmen are equipped to access and operate on most London properties, both commercial and residential

Whether asphalt, mineral felt, slate, tile or lead Grand Alliance will bring a swift and effective resolution to any roofing fault.

Pitched Roof

The pitched roof is the most common type of roof construction used in new dwellings today. Pitched roof design will include a system of structural elements usually made from timber which provide support to a sarking felt, sarking board or breather membrane underlay. Over the underlay, tiling battens are nailed directly to the structural elements, providing support and a fixing point for a weather proof layer which normally consists of slate, concrete or clay tiles. The primary function of a pitched roof is to shed water from a dwelling in poor weather conditions; however it has also become an increasingly important element when considering the most cost effective ways in which energy use in dwellings can be saved.

Flat Roof

Most flat roofs consist of a timber decking nailed to the roof joists covered with three layers of roofing felt. They are often used on house extensions and garages. Using a layer of proprietary chipping compound, such as limestone, gravel or granite on top of the layers of felt, strengthens the surface further. The idea is for the surface to reflect rather than absorb sunlight, thus helping to protect the felt.

Slate Roof

Slates are usually more time consuming to fix than tiles because every individual slate has to be aligned and fixed into place with two nails; there are no nibs on the back to locate them on the wooden battens.

Tiled Roof

Roof tiles are available in a range of patterns and colours. They are usually made of concrete, but occasionally made of clay. The colour range includes shades of red, green, brown and green. The finish of the tiles can be smooth or grained. As with all smooth surfaces, rain will run off more quickly and the grained tile is only suitable for a roof having a greater slope. Check with the manufacturer when choosing a tile, as they will recommend the minimum sloping angle for each style they produce.

Roof and Guttering

The roof and guttering must be kept in a good condition to enable a property to remain weatherproof. Ineffective covering can lead to expensive work to the underlying timbers and any decorative finishes, which will deteriorate rapidly in damp conditions. Different roof coverings have varying life spans. The materials used, the quality of the workmanship and the exposure to the elements will all be contributing factors to the effective life of the roof. There are some that last for a hundred years or more, while others deteriorate after 40 years, some are only guaranteed for 20 years reliable cover. You may only realise that a repair is needed on the roof when ceiling stains are noticed in a room after rainfall. This indicates that water is leaking into the roof space and you should always repair damage as soon as possible to stop further rainfall damaging the fabric of the house.

Why choose us?

London’s choice for building and repairs

Projects done on time

Our team will do all your projects on time ad well within the budget. You can be safe and certain about that with our company.

Always available

We’re there for you anytime you need us. Contact us for a consultation, estimate or any question you might have about your project or our work.

Professional and responsible

You can always turn to Grand Alliance Ltd. Our team of professionals will help you realise your dreams for your building.


I’ve had the pleasure of working with Alex at Grand Alliance for several years now. We have always found Alex and his team to be hardworking, reliable and well priced. The team have decorated our Fitzrovia office several times, completed 8 bathroom refits to an incredible standard, recommended great carpet fitters to us and helped with general repairs. We would highly recommend them!
/Alexandra Raven, Fitzrovia, London/

Really professional team, delivered exactly the results they promised in the timeline they stated and on budget.
It’s hard to find good contractors / builders that deliver to exacting standards. I highly recommend without reservation, need I say more.
/Stuart Maclean, South East London/

Alex and his team come highly recommended. Installed new kitchen and bathroom with internal remodelling.
Very professional attitude and project planning, respected my home and didn’t treat it like a building site.
Above all reasonably priced for the high quality of work they do.
/Quincy Chuka, London/

We have used Grand Alliance on three different occasions. To do our loft extension, en-suite bathroom and kitchen refurbishment. We have always found their work to be of a high standard and high quality. The company is reliable and punctual. I would thoroughly recommend.
/Sally Cole, London/

Had my whole flat refurbished through this company, fantastic workmanship, quality and timing, would highly recommend!
/QPark Geo Map, London/

Very reliable company which offers a wide range of services at competitive prices, and has friendly and professional staff.
/Honie Duncan, London/

I have employed Grand Alliance company for full refurbishment and side extension of my house and quality of work was very good and financially I was very satisfied!!!
/Angelo Won, London/

Very nice people, happy to do business with them.
/Hussain Ashmere, London/

About Us

Twitter Feed

Contact Us

Your Name (required)

Your Email (required)

Your Message