Subsection (4) applies where the conditions in subsection (2) are met in relation to two dwellings (the "main dwelling" and the "associated dwelling") on a day ("the day in question") in a chargeable period.
The conditions are that—
The common ownership condition is that—
(It does not matter whether or not the interest in the main dwelling and the interest in the associated dwelling are held for the same title.)
This Part has effect in relation to the interests mentioned in paragraph (a) or (as the case may be) (b) of subsection (3) as if the main dwelling and the associated dwelling were, on the day in question, suitable for use as a single dwelling.
Subsection (4) does not apply if—
Those provisions are—
section 133 (property rental businesses);
section 134 (rental property: preparation for sale etc);
section 137 (dwellings opened to the public);
section 138 (property developers);
section 139 (property developers: exchange of dwellings);
section 141 (property traders);
section 143 (financial institutions acquiring dwellings in the course of lending);
section 144A (regulated home reversion plans);
section 145 (occupation by employees or partners of a qualifying trade or property rental business );
section 147A (caretaker flat owned by management company);
section 148 (farmhouses);
section 150 (providers of social housing).
The reference in subsection (3)(a) to a person connected with the company does not include a public body (as defined in section 153) or a body listed in section 154(2) (bodies established for national purposes).
The reference in subsection (3)(b) to a chargeable interest being held for the purposes of the same collective investment scheme includes a reference to a person connected with the scheme being entitled to the interest.
The associated dwelling has "separate access" only if—
In this section—
in relation to a dwelling or dwellings, references to the "garden or grounds" are to land occupied or enjoyed with the dwelling or dwellings as a garden or grounds;
references to the person entitled to possession of a dwelling are to the person entitled to possession of the dwelling by reason of an estate or interest held by that person;
"separately entitled" means entitled otherwise than by reason of a chargeable interest in or over the main dwelling.