Looking for a team of building specialists in High Wycombe and across South Bucks?

We undertake all projects, big or small and specialise in major renovations including;
Extensions – Loft Conversions – Restoration & Alterations
Garage Conversions – Landscaping & Patios – General Building Work

We are committed to delivering the highest standards of workmanship to our customers and take great pride in all that we do. Check out ‘Our Services’ to find out more…


A great way to add extra space and increase the value of your home…

Loft Conversions

A loft conversion is one of the easiest ways to add more space to your home…

Restoration & Alterations

Renovating or altering your property with major changes like remodelling…

Garage Conversions

A part conversion gives you additional room space while retaining storage…

Landscaping & Patios

Redesigning your outside space with a landscaped garden and stunning patio…

General Building Works

As well as specific projects we provide general building services including…

Working together to create beautiful, practical and cost effective spaces around your home

We are Allen Building Services specialising in extensions, loft conversions, garage conversions, restorations & alterations, landscaping & patios and more.

We offer a full construction service, working with your architects and designers to create your dream space, from concept to completion. Our team has many years experience and we have developed long-term partnerships with tried and tested professionals and tradespeople including carpenters and joiners, plumbers, electricians etc so we are able to offer a complete service managed by us and all delivered to the highest standards.

Whether you’re adding a master bedroom en suite in the loft or dreaming of lavish open plan living, get in touch today and tell us about your plans. We will tell you how we can help and provide you with a detailed quotation.



Because We're Experts...

We are a dedicated and energetic team with many years experience in the building trade enabling us to deliver all types of project, complex or simple, big or small.


Because We Deliver What We Promise...

We set realistic expectations and strive to deliver on time and on budget. Our key objective is for you to be far more than just satisfied with the end result.


Because We Price Fairly and Honestly...

We calculate the price for your project based on the materials required and the time we believe the job will take. We don’t under or over estimate and we don’t add silly mark-ups.


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Get In Touch

Get in touch today and tell us about your project. We will arrange a suitable time to come around and view your property, discuss in more detail and take measurements and from there we will produce a detailed quotation including costs and estimated timescales. You can call, email or submit the simple contact form and we will come back to you.

07919 434128