Second-storey extension guide
A second-storey extension can add major space, but it is structurally and legally more complex than a rear extension.
Building upward is attractive when garden space is limited.
The existing foundation, walls, roof and stairs determine what is realistic.
Structural feasibility
The existing home must be able to carry the extra load or be reinforced.
A structural engineer is usually involved early.
Layout and stairs
The new floor only works when the stair position, landing and room layout are practical.
Wet rooms upstairs add extra complexity for drainage and structure.
Permit and street image
A second-storey extension changes height and appearance, so permits are normally required.
Municipal design requirements can influence roof shape and facade materials.
Summary
A second-storey extension starts with structure and permit feasibility before layout is finalised.
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