Specialist in Garage Conversions and Extensions for St Albans

Stag Builders of Hertfordshire, are a family run building company providing building services in St Albans. We have always been keen on renovating properties, building kitchen extensions, and specialising in loft and garage conversions. With our experience and knowledge, we can make sure that your home and project are in good hands.


We have a dedicated team in St Albans, carrying out building services to a high level of professionalism.  We believe that being a family run business, personal communication and care with our clients is central to our success.

We hope from the photos and information on our website, we have give you an idea on what we can and have achieved. Please contact us using our contact form, on the contact us page. Or if prefered, call us to arrange an appointment for a  survey of your property. By visiting your home, we can generate an accurate fixed price quotation, helping you to budget for your forthcoming project. By using our services, we can help you achieve that perfect finish, as we pride ourselves on a high standard of work, and reliability.

Dormer Loft Conversion

Rear Property Extension Radlett

Rear House Extension

Property Extensions In Radlett

Garden Room

House Exstension Radlett

What are the different types of house extensions?

The term ‘house extension’ simply refers to any structure that’s added to the original building. This can be a loft extension, basement extension, a kitchen, a living space, or even a new bedroom. Extensions can be made from a variety of materials: from simple brick & block to more expensive, luxury designs, such as those including structural glass.

House extension companies in St Albans should be familiar with period properties. When extending or modifying a period property, it’s important that you know what to look out for. These properties were designed and built decades ago. While they all appear to follow a certain symmetrical pattern, no two properties are the same. All of them have their own quirks. In addition to this, over the decades, they have all been cared for and adapted in different ways. 

Undertaking a home renovation or extension is a substantial project, both in a financial commitment and from a time perspective. We thought we would talk you through three of the main things to consider if you are thinking of undertaking a home renovation or using specialist builders to build your house extension in St Albans.  

House extensions and renovations, what does 1st fix and 2nd fix mean?

If you’re planning any kind of house extension or loft conversion in St Albans, you’ve probably heard someone using the terms "first fix" and "second fix", but what do they mean?

All home extensions start with a set of awesome architectural floor plans, and either a planning application or lawful development certificate application. But once you’ve actually started construction, you can think of the “first fix” and “second fix” as the two main stages of your building project.

It’s important to know the difference between these two stages, as it’s likely that individual contractors - including plumbers and electricians - will need to come back to finish different jobs during each fix.

Contingency Budget

In general terms, it depends on the project. For a ground floor house extension in St Albans, you are digging down into a territory that is largely unknown prior to the opening up building works commencing. From time to time, there might be issues with the property foundations which might mean there is additional work required by your builders. When it comes to a loft conversion, there is generally very little that crops up unexpectedly. You aren’t uncovering much and so there is very little is unknown prior to the commencement of the Building works.  

St Albans: 01727 432 002