Specialist builders

Avanti building contractors are specialist residential builders and commercial builders. With many years experience, we pride ourselves on providing all our clients with expert building services and extensions to properties of all sizes, whether residential or commercial. So get in touch to see how we can help you with your building project.

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About our Wiltshire builders

Quality building contractors since 2003

Avanti (SW) Ltd are building contractors in Wiltshire, was registered in 2003 by Mark Herbert.

Mark – director of Avanti (SW) Ltd Building Contractors, has an extensive history in the building trade dating back to his teen years having been brought up within the building trade and boasts more than 40 years experience! 

Over the years, and hundreds of successful projects later, Avanti (SW) Ltd have an experienced and reliable team of sub-contractors that we work alongside on a regular basis.

Our building contractors cover all bases of trades required to complete your building project  - no matter what size or level of complexity. Our expert skill sets include roofers, lead work, glaziers, carpenters, bricklayers, heating and plumbing engineers, electricians for all types of electrical works and so much more.

As the years have progressed, the company has gone from strength to strength obtaining an enviable reputation in the trade.  

And despite the recent pandemic that has forced many organisations to suffer or even close, Avanti (SW) Ltd continue to successfully win building contracts that are completed to high specifications.

Avanti - Your building contractors in Wiltshire

Residential property extensions

One of the most popular services that we offer – amongst many others -  is that of residential property extensions.

We have found in recent years, more than ever, residents of private property's are opting to extend their properties in favour of moving to larger premises should it be to accommodate their growing family, increase the value of their property, or for whatever reason they choose!

Avanti builders excel in this field of the building trade and can also highly recommend architects in the Wiltshire area to start you on your journey.

Extensions to properties come in various sizes and options. Since we're talking about house extensions; in Wiltshire the most popular type of extension to a home is a single storey 'outwards' extension and a two storey 'outwards' extension.

This popular kind of extension allows for more living space and, seems importantly, more bedroom space.  It also offers the opportunity to create new spaces for various uses – utility space, dining space, work or leisure space and summer room creation, among many others.

Another popular extension option is to extend upwards to create a whole new floor! 

Most extensions will require building regulations and we would be happy to discuss the process with you or you can speak with your architects.

Other home owners just like to optimise the space that they already have and choose the option of knocking through walls and/or reconfiguring the layout of their homes.

Flat roof extensions by Avanti Builders in Wiltshire


Project management

If required, we at Avanti Builders will project manage your entire build project, as your main builder, to employ and manage subcontractors including electricians, plumbers, floor layers, landscapers, etc. meaning you don’t have to engage with a large number of different parties. This will make your whole build project run smoothly and within budget.


Commercial building contractors

Avanti (SW) Ltd have dealt with the commercial building sector for many years, finding and building solutions for expanding companies.

We also provide the service of renovation of commercial properties that can include the upgrade of offices, refurbishment of rest rooms and canteen areas etc. With the ever increasing restrictions and controls on Health and Safety, we are often asked to refurbish properties in order that they are in line with all current legislations.

From the larger projects of new buildings and refurbishments, we are offer smaller maintenance works that may be required to a) improve the properties or b) again to maintain ever changing compliance in the workplace.

With contacts in the field of commercial builds and refurbishment, no job is too large or too small.

The health and safety of both our contractors and of our clients are paramount in our work practice and compliance to health and safety measurements are at the forefront of the services we offer.

We work to the highest standards whilst maintaining prices that are competitive and realistic.

Our building portfolio

We welcome you to browse through some of our building projects

Let's talk about your building project

Get in touch with our team of skilled builders in Wiltshire
Get in touch
Copyright © 2025 Avanti (SW) Ltd  |  All Rights Reserved
Avanti SW Ltd - Building Contractors
Unit 8, Porte Marsh Road
Porte Marsh Industrial Estate
Calne
Wiltshire
SN11 9BW

Mark: 07900 304 441 or Danny: 07949 745 560
e: enquiries@avanti-builders.co.uk
www.avanti-builders.co.uk