The following example house extension plans consists of a two storey side extension forming a granny annex, a single storey rear extension forming a garden room and a loft conversion with 2 dormer windows.
The client had a requirement to move her mother into the family home allowing better connection as the clients mother grew older. To provide enough space and independance the granny annex was designed as a two storey side extension. This provided enough space for a decent sized living room, kitchen and ground floor wet room as well as 2 bedrooms and a bathroom on the first floor.
Access to the annex at ground floor level is via an independant front door and a pair of doors connecting the annex to the orginal house. The annex also has its own access to the garden via French doors. The stairs of the annex were designed to be wide enough to facilitate the future installation of a stair lift. The first floor landing and doors being large enough to enable ease of access.
The first floor bathroom was designed with two way access 'Jack and Jill'. When visitors using the second bedroom were not present the bathroom can be used as an en-suite only. The positioning of the bathroom furniture and doorway openings allows for the future adaptation of a ceiling hoist from the main bedroom and the alteration of the bathroom to a large shower tray or disabled use bath tub.
The loft conversion plans consist of 2 double bedrooms and a bathroom. This achieved by raising the roof to gain the required amount of headroom. Each bedroom benefits from a dormer window to the rear providing additional floor space and an area to place a dressing table and velux roof windows to the front providing natural light and ventilation. Access to the loft space over the granny annex is via a small door off one of the loft bedrooms.
With all loft rooms the head room diminishes with the roof pitch. Although this remaining space isn't suitable for a room, it was designed to be used for storage so as not to waste any of the available space.
The loft floor bathroom has a velux roof window over the toilet to gain every available bit of head room to ensure that the bathroom is comfortable to use.
Access to the loft floor is via an extension to the existing house stair well. In this case it worked well by already being fairly central to the house resulting in little disruption to the existing first floor rooms.
Generally the extensions and the loft conversion were designed to have better than minimum insulation requirements to help keep the heating costs of the house down. The client wanted solar photovoltaic to take advantage of the feed in tariff available at the time and solar hot water panels installed on the roof to make a measurable difference to the heating costs of the house. The annex was fitted with single room heat recovery ventilation systems to the bathrooms and kitchen and within the loft is a positive input ventilation system which ensures that there is a regular change of air within the whole house even with the windows shut.
The en-suite off the existing house master bedroom due to losing its window and access to an external wall was fitted with a single room heat recovery ventilator rather than just installing a simple extract vent. The loft floor bathroom was also designed to have a single room heat recovery vent.
The specification of single room heat recovery ventilation systems in this extension and loft conversion design was due to the complexities of installing a suitable whole house ventilation system which although is a better system is not easy to retrofit.
Externally as an extension to the home, the design had to appear subservient to the existing house. Yet it was important to ensure that it appeared as though it was always part of the existing house. Features such as tile hanging over the first floor walls and rear gable tied the appearance of the extension to the existing house while the staggered front elevation showed the two storey extension as being subservient. The extension forming the annex projected to the rear introducing a gable which helped to break up the roof line and expanse of brick. A side projection formed a stair enclosure so as the stairs had minimal encroachement into the annex.
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Example granny annex, single storey extension and loft conversion plans
- 3D visualisations - Site location plan - Existing ground floor plan - Existing first floor plan - Existing elevations -
- Example ground floor plan - Example first floor plan - Example loft conversion plan - Proposed front and LHS elevation -
- Proposed rear and RHS elevations - Sections AA - Sections BB - Section CC - Section DD - Section EE - Section FF -