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Avanti Ultimate Pent Workshop


Avanti Ultimate Pent Workshop


So you’ve made the decision, it’s time to take the leap and invest in your work life balance, leave behind the battles of the corporate office environment, the fight for parking then the Que for the morning coffee fix, enough is enough and United Garden Buildings Avanti Workshops are designed to ensure you that you made the right one.
Designed & manufactured to comply with Garden Building planning regulations. We offer an array of products and services to suit your needs, everything from the building layout to the finishing touches, all in one place saving you time and money on your investment.


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Avanti Ultimate Pent Workshop

Fully insulated Workshop perfect for year-round use. A robust versatile building ideal for use as a Garden Office, Gym, Summerhouse, Games Room or Extended Living Space.

No planning permission needed.

What’s Included

  • Pre-Insulated composite panels
  • Internal cladding board
  • 11mm T&G Floor
  • Timber frame double glazed doors & windows
  • Mineral Felt Roof Covering
  • Building Instructions
  • Free Delivery

Fully Insulated

We use high-quality Multi-foil insulation allowing you to comfortably use your workshop all year round.

The reflective Multi-foil insulation blanket keeps maximum heat in the building during the cold winter months and reflects heat from outside during the warm summer months keeping you cool.

One of the leading insulation products on the market a single layer of the Multi-foil insulation gives you over 2.0m2k/w Thermal Resistance equivalent to 120mm of fibreglass insulation and 50mm of a rigid board such as Kingspan/Celotex.

The insulation comprises of 6 layers of Thermo-Wadding, Breather Foam and Reflective Foil.

Internal Lining Board

Smooth to touch 9mm vertical patterned internal cladding board finished with skirting and architrave.

All internal cladding components are white primed ready for painting.

​​​​​​​LP strong Core External Cladding

Treated engineered composite wood cladding giving you the ultimate protection in the toughest of climates.

Specially treated for protection against rot and decay.

Excellent resistance to warping, splitting and checking.

Free from knots, patches and face voids.

Offers superior impact resistance.

Four Components of Protection

Waxes; special water-resistant waxes coat each strand of wood for enhanced durability in rainy, humid environments.

Resin-Saturated Overlay; Helps resist moisture intrusion while providing a durable base for quality paint adhesion and beauty.

Borates; effectively resist damage from fungal decay and rot for decades, helping to preserve the integrity of the cladding.

Advanced Binders; help resist impact damage.​​​​​​​

Double Glazed

Timber frame double glazed doors and windows as standard. manufactured in our factory in the midlands using quality European graded softwood. For maintenance-free heightened security, we give you the option to upgrade to Upvc, available in a choice of 3 colours, white, light oak or graphite.


The Avanti Ultimate Pent Workshop is supplied with an 11mm T&G floor as standard ideal for everyday use, for more intense use we offer upgrades to 19mm or the ultimate 28mm Tongue and Groove the best choice to accommodate heavy gym equipment etc.

In addition to the floor upgrade options, we offer the supply and installation of quality 12mm engineered laminate flooring, available in many colour finishes to best suit your intended use. Available with our expert assembly service.

Weather Protection

Mineral felt roof covering is the standard choice with the Avanti Ultimate Pent Workshop.

We highly recommend the firestone EPDM rubber roof upgrade for this building. A 25-year manufacturer guarantee gives you total peace of mind when it comes to weather protection.

By far the best choice when it comes weather protection a seamless finish is a key feature, no joins or overlaps for water to penetrate into your building, installed using specially formulated adhesive without the need for nails piercing the protective covering.


The most important aspect of any building is the foundation. A solid, flat, level base is needed for your building to be assembled on.

United Garden Buildings offer a timber frame base supply and installation service. We use quality C24 rated 6×2 pressure treated timber frame fixed to 4×4 posts, only the highest quality pressure treated timber is used for maximum longevity. This service is far more cost-effective than the standard concrete option saving you not just money but time, with no need for excavating, installation of aggregates or the install of costly concrete our timber base is installed on top of the existing ground raising your building allowing good airflow beneath protecting against moisture and standing water, a typical pitfall of a concrete base, thus increasing the longevity and performance of your new garden room.


Along with the timber base we supply, we can extend to add a decking area to the front of your building.

We offer 3 standard-sized areas along the front of the building and out 4ft, 6ft and 8ft, we can supply an area to your specific dimensions simply contact us for a quote.


The Avanti Ultimate Pent Workshop is supplied flat packed with instructions for self-build assembly. It would take two people with advanced DIY skill approximately 3-4 days to assemble this building to a good standard.

Expert Assembly Service

Save yourself time and money with our expert assembly service along with solidifying the 15 years guarantee.

Our assembly teams have a vast knowledge of our full product range with heavy involvement in the actual design of the products we supply. Our teams assemble our buildings nationwide on a daily basis.

Our guys have these buildings assembled within 2-3 days depending on the upgrade options you would like.

With this service, we give a 12 months workmanship guarantee.

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