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KOTI (medium)

Typical price £65,000 (inc. VAT)

Our recommended size for a compact one-bedroom annexe. Fully insulated with all the essentials for ancillary living. Choice of a flat or pitched roof.

KOPPISPACE LTD hosts a strong brand of domestic garden buildings; from DIY Kit builds all the way to large residential annexes. We’re a family run business, fully insured and well accredited.

Our brand promotes the use of natural material with almost zero wet products, with an emphasis on architectural detail and customisable features.

The iconic design has quickly become one of the most sharply detailed, yet most minimal timber based annexe available in the UK. These are hand-crafted buildings procured with precision 3D BIM software, with multiple options available to adjust the appearance and function of your building. They can be made to bespoke requirements; size, cladding and fitted furniture can be made for each project.

Our buildings represent everything that we are well known for as D&B contractors: striking contrast, honest practicality and a hands-on approach to changing the way you live and work at home.



Insulated floor base supported by plinth pads or ground screws and decked with sturdy boarding.


Traditional timber framed structure with 175mm PIR insulation. Dual residual cavities with options for external and internal finishes.


Insulated warm roof construction with options available for the covering. Internal finishes to match the wall interior.


Double glazed aluminium units with standard security locks. Obscure glass to shower suites.


Low energy electric heaters with programmable features, electric towel radiators in shower suites and an 80ltr unvented system for hot water.


Fitted kitchen complete with appliances, choice of colours and worktop finishes.


Fitted shower suites with a basin, toilet, shower doors and non-slip flooring.


U-Value (Walls): 0.12W/m2K. Glazing: 1.6W/m2K. Insulation: PIR @ 0.022W/mK. Cavity: 50mm, ventilated low emissivity to UV membrane.


Recommended Air Change Rate: Min. 6 per hour. Mechanical air flow rate: (without air conditioner Max. 54m3/hr) (with air conditioner Max 500m3/hr). Hood Extractor


Circuit Power: 230v with RCD. LED: Dimmable. Extractor: Max 1.1kW, 12dB.

Infrared Panel/Electric Heater: 230v, Wattage subjected to volume. Air-conditioner if installed: 10K BTU <30m2, 2.8kW cooling, 2.3kW heating, <58dB.


Part L: Yes. EC5: Yes. Guarantee: 10 year structural, 10 year IBG, manufacturers guarantees may apply. G3 certification for the tank, EICR for the electrical works.


When it comes to building an annexe, the Planning guidelines aren’t exactly clear and there are no proper definitions to allow for permitted development rights. We’d take a view on each project and would usually involve the help of our well-experienced consultant.

We’d make an application to your LPA on your behalf. The fee for this is charged upfront, and is deducted from the cost of your project should you choose to go ahead.


Since our projects are hand-built, the materials and components are transported by us. For projects further than 80 miles from IP25, we may need to charge a small fee for additional costs incurred.


Typically, a W9.5m x D4m would take around 10 weeks to build, excluding any planning timescales. We’d advise an estimated build time in the early stages of design, and we generally work with a lead time of around 8-10 weeks. We aim to be transparent with costs and timescales associated with your project, so that you are always fully informed of how things are getting on.

Access Requirements

They’re hand-built, which means we can be flexible with how your building is going to be assembled. We’d require space to park at least one van, and we’d politely ask that the client provides any permits applicable to roadside parking/off-loading.

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Finance available. Buy now, pay monthly. Provided by iDeal4Finance.

'Rooms2U Ltd' is an introducer appointed representative of Ideal Sales Solutions Ltd T/A Ideal4Finance. Ideal Sales Solutions is a credit broker and not a lender (FRN 703401). Finance available subject to status. The rate offered is always provisional and will depend upon your personal circumstances, the loan amount and term.

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