Log Cabin Granny Annexes

One and two bedroom annexe models

The table below lists annexe models and their catalogue default wall profile. Dimensions are external. A solid log model can also be made in any of the 28, 34, 44, 58 and 70 mm profiles, confirmed per order.

More 1 and 2 bedroom layouts sit in the wider 1 bedroom and 2 bedroom ranges; base sizes by model are listed on base size by model.

How big can a granny annexe be?

There is no single size limit for a granny annexe in England. Annexes generally require planning permission, and the size is assessed as part of that application against the plot and the intended use. Class E of Part 1 of Schedule 2 to the Town and Country Planning (General Permitted Development) (England) Order 2015 (S.I. 2015/596) permits a building required for a purpose incidental to the enjoyment of the dwellinghouse: a single storey, eaves of no more than 2.5 m and an overall height of no more than 4 m with a dual-pitched roof. Whether an annexe used as living accommodation falls within it is decided by the local planning authority.

Where an annexe is built as a mobile home under the caravan definition, section 13(2) of the Caravan Sites Act 1968 sets the limits of a twin-unit structure: 20 m in length, excluding any drawbar, 6.8 m in width and 3.05 m in overall height of the living accommodation. Eurodita Mobile Log Homes are built in glulam to a mobile-home brief, from 8 x 5 m with one bedroom up to 20 x 7 m; the models within the 6.8 m width run up to 20 x 6 m and 18 x 6.8 m with four bedrooms. Whether a unit meets the caravan definition, and how it is classified on site, is confirmed through the project route, not by Eurodita.

Wall build-ups and insulation

The solid annexe models are catalogued in 44 mm wall logs and can also be made with 28, 34, 58 or 70 mm wall logs; the profile is confirmed in the written quotation. Where a cavity for insulation is wanted, four twin-skin build-ups are available: 44-50-44, 44-100-44, 58-50-58 and 58-100-58 mm, each a cavity wall prepared for insulation. Availability of a given build-up is confirmed per order.

Insulation material for the cavity is bought locally rather than supplied by Eurodita, and no U-value is published for a finished build-up. A wall thickness on its own does not establish a thermal, fire or structural performance figure; the agreed specification, glazing and installation quality all affect the finished building.

Base, services and what Eurodita supplies

Eurodita supplies the kit: wall logs, floor and roof structure, windows and doors, machined and kiln dried in Lithuania, packed flat with the drawings for the order. Floorboards are 28 mm as standard and floor bearers are impregnated as standard; wall logs are untreated by default, with factory painting available as an option with limited capacity.

The base, foundations, drainage and access remain the buyer's or dealer's responsibility, as do electrical, plumbing and gas connections, which are not part of the standard Eurodita supply. Assembly on site, installation and unloading at the delivery point are arranged per project with the buyer or their contractor, and delivery can be quoted separately from the kit.

Planning permission for a granny annexe

Whether a granny annexe needs planning permission, and on what terms, is decided by the local planning authority, for each site. This is confirmed by the buyer or their dealer with the local authority before ordering; Eurodita does not determine or guarantee the outcome. The routes a buyer in England checks are set out in granny annexe planning permission.

Where a project specifies it, Eurodita can manufacture to caravan-framework dimensions. This is a manufacturing brief, not a certification: Eurodita does not secure or guarantee planning permission or building control sign-off, and classification, siting and local approval stay with the buyer's route.

Council tax discount on a granny annexe

In England, a self-contained annexe normally receives its own council tax band from the Valuation Office Agency. Under the Council Tax (Reductions for Annexes) (England) Regulations 2013 (S.I. 2013/2977), the bill for an annexe is reduced by half when the annexe is used by a resident of the main dwelling as part of their sole or main residence, or is the sole or main residence of a relative of the person liable for council tax on the main dwelling.

Under Class W of the Council Tax (Exempt Dwellings) Order 1992 (S.I. 1992/558), an annexe is exempt when it is the sole or main residence of a dependent relative of a person resident in the main dwelling; a relative is dependent when aged 65 or more, severely mentally impaired, or substantially and permanently disabled. Under Class T of the same Order, an unoccupied annexe that may not be let separately from the main dwelling without a breach of planning control is exempt. Your local council decides eligibility, so apply to the council once the annexe is in use.

How a granny annexe is quoted

Every annexe is quoted in writing, per order, in EUR, on an EXW Eurodita factory basis by default. There is no public price list. What drives the figure is bedroom count, external size, wall profile, joinery specification, options such as painting, and the delivery basis agreed for the order.

Drawings, a 3D visual and the specification are produced from the Eurodita design system for the configured project, once the brief is confirmed, rather than issued generically ahead of a quotation. For how a quotation is structured and how to request price, drawings and specification for a given project, see reading a Eurodita quotation and how to get price, lead time and technical data.

Who buys and how to start

Private buyers, builders and dealers all send their annexe brief to Eurodita. Each project is assessed individually, and whether it is quoted directly or through a dealer near the buyer is confirmed per project rather than set by a fixed size threshold.

Dealers and distributors interested in reselling the annexe range can review terms on the dealer programme page. For a specific annexe brief, whether through a dealer or direct, send a project enquiry with the intended use, bedroom count, required dimensions and any planning or building-control route already agreed locally.