Continue Shopping
Mon-Fri / 08:30 - 21:00  |  Sat-Sun / 10:00 - 20:00

Project Timber accepts Visa, Mastercard, Amex & Maestro through our 100% secure SSL payment providers - WorldPay & PayPal.

01777 802300 - Click here to call now!
It appears you are visiting us on Internet Explorer 9 or earlier. Please upgrade to a later version of Internet Explorer. Alternatively, you can view our website on Google Chrome, Mozilla Firefox or Apple Safari.
Free delivery
on selected postcodes
Call for Quote
50 years experience
Manufactured in Great Britain
Check delivery time
Click to enter postcode
Free delivery
Click here to check delivery time
  • We'll deliver any product to your home, 5 days a week and even in two working days.
  • We schedule deliveries from 8am until 6pm.
  • Free delivery is also available.
  • We'll text you a 3 hour timeslot on the morning of your delivery.
  • Your driver will attempt to call you when they're on the way.

Project Timber Evolution Long Window Pent Garden Room

Cool in the Summer, Warm in the Winter
  • Zero Maintenance*
  • Insulated as standard
  • Double glazed as standard
  • Optional UPVC upgrade
  • Installation available!
  • Free Delivery from 48Hrs*

From £132.06 / month

For 20% discount use code JAN20
In stock
Multiple sizes available
Easy composite cladding construction
Multi purpose interior
Fully insulated
10 year anti rot guarantee

Disclaimer : Painted buildings are for illustration purposes only. All buildings are on their standard or pressure treated colour upon delivery. Furniture and internal props are not included.

Cool in the Summer, Warm in the Winter

What’s included?

  • All fixings and fittings
  • Easy to follow instructions
  • Pre-assembled panels, roof and floor
  • Insulation and interior cladding
  • Extra high ridge and eaves height
  • Long fixed windows and door, double glazed as standard
  • Opening side windows
  • Signature mineral felt
Evolution Insulated Garden Office
Composite Exterior Cladding
Unique Exterior Cladding
Project Timber Treated Engineered Wood
Evolution Insulated Garden Office
Fully Insulated

Fully Insulated

Evolution comes fully insulated as standard making it perfect for use all year round. The multi-foil insulation locks heat in during the colder months and deflects heat in the warmer periods. Meaning that Evolution is always at a comfortable temperature.

We’ve made sure that Evolution is secure so that all your belongings are safe, as standard Evolution comes with a high quality mortice lock. This gives you the peace of mind that your space is protected, along with a thicker and doubled up framing which gives your buidling extra strength

Hand Crafted

The Evolution is built by our fully trained product development team using hand-selected graded scandinavian slow grown timber and state of the art composite exterior cladding in house at our facility in Nottinghamshire, in the cusp of Sherwood Forest.

All of products are checked before delivery making sure everything meets our high standards

Hand Crafted
Team Hard Work

We do the hard work for you

Evolution comes with pre-assembled panels which we line with insulation before it’s delivered to your door. Making the installation of Evolution easier for you or your installer, whilst saving you time and money.

Alongside this we have created a set of easy to follow instructions which are sent out with every building, making your Evolution experience a pleasant one.

Create your own Evolution

We’ve built Evolution with upgradability in mind, allowing you to customise your buiding to your exact specification.

We offer multiple upgrade options for Evolution, we can upgrade your floor to 19mm or 28mm for heavy duty applications. To give extra protection to your Evolution we can upgrade your roof to a unique rubber covering which will give you 50 years of protection.

With its modular construction we can configure your Evolution to perfectly suit your garden or outoor space with extra side doors and windows. To go along long fixed double glazed windows which comes as standard.

Create your own Evolution

LP Strongcore Cladding

 svg 3E

The next generation of outdoor space



Excellent seller,good delivery,very good product and price!!!

 stars re


Many thanks for speedy delivery. Item as described. Will use again

 stars re


Absolutely love our summer house we purchased from Project Timber. Quality is superb at such a great price. Customer services are fast to answer any queries you may have and will be ordering again from them again.

 stars re


Extremely helpful people selling a good product at the right price, delivered on time and I can’t find anything to be critical about.

 stars re


The sales team were excellent and answered all our questions. Delivery was as arranged and the delivery driver couldn’t have been more helpful. The timber and its pressure treatment is good quality and the construction plans were easy to follow. We are delighted with our new summer house.

 stars re


Brilliant company, so easy to deal with. The summerhouse arrived on the date they said a two great young men erected it within about 4/5 hours. Extremely efficient and friendly. As for the summer house, well it’s great and so affordable. My son uses it daily as a man cave with a sofa ,TV.and games console .

 stars re


First time we used Project timber. Very easy to communicate with. Delivery was on time. Drivers polite and helpful. Building was easy to erect and seems good quality.

Start creating your Evolution today

At Project Timber, we aim to provide you with the best customer experience as possible. We want to help you find the perfect outdoor building, exactly the way you want it

Evolution Garden Office Apex Shed


High quality materials

Composite timber and tongue and groove construction


15 Year Anti rot guarantee

Treated to protect against fungal decay and rot


Longer lasting

Made from extra durable materials that withstand the elements


Thicker and doubled up framing

Giving your building extra strength


9mm durable composite timber cladding

Treated engineered wood technology for long-lasting performance


Insulated as standard with Multi-foil Insulation

"Multi-foil Insulation locks the heat in with the same U-Values as 120mm Glass Wool Insulation"


Building comes unpainted as standard

Water-resistant waxes coat each strand for greater durability in wet weather


Extra high ridge and eaves height

For a fully usable space


Opening side windows

Extra ventilation for extra comfort


Long fixed windows and door, double glazed as standard

For extra light and panoramic views of your garden


Contemporary pent roof style with an overhang

A modern and stylish garden building


Composite timber internal walls

Durable, attractive, and premium appearance on the inside


Floor options available

Pressure treated with multiple thicknesses available


Multi purpose interior and ideal office space

Suitable for all year round use


Mineral felt is included as standard. Upgrade to rubber roof

Protection from the elements


All fixings and stage by stage instructions included

Simple assembly for a quick and easy build

Select Size
Select Measurements
Overall Dimensions
Overall Width
Overall Depth
Width Internal
Depth Internal
Eaves & Ridge
Eaves Height Inc. Floor
Eaves Height Excl. Floor
Ridge Height Inc. Floor
Ridge Height Excl. Floor
Eaves Height Internal
Ridge Height Internal
Shed Type
BillyOh Range
Roof Style
Fixtures & Fittings
Cladding Style
Locking System
Interchangeable Windows
Basecoat Treatment
Pre-Assembled Side Panels
Select options
  • Size
    Please Select..
  • Front Window Style
    Please Select..
  • Side Panel
    Please Select..
  • Roof Cover
    Please Select..
  • Floor
    Please Select..
  • Guttering Option
    Please Select..
  • Paint Colour
    Please Select..
  • Colour Trim
    Please Select..
  • Laminate Floor
    Please Select..
  • Building Assembly Service
    Please Select..
  • Rubber Roof Assembly Service
    Please Select..
Buy Now
With Voucher
Per Month
Check Delivery Time
Simply enter your postcode to customise delivery times to your address.
Request a callback