Chiswick is a district of west London, not a borough in its own right — for planning purposes it falls under the London Borough of Hounslow, which is who you'd apply to and whose rules apply. It gets its own guide here because Chiswick's conservation coverage and housing stock are genuinely unlike the rest of the borough, and borough-level advice is too coarse to be useful on a W4 street.
This guide covers what actually matters if you're weighing up a heat pump, solar panels or air conditioning in Chiswick specifically. For borough-wide rules, grant administration and how west Hounslow differs, see the Hounslow borough guide.
Chiswick sits inside the London Borough of Hounslow, which has one of the highest concentrations of conservation areas of any London borough — most of them clustered right here in Chiswick, Brentford and Isleworth.
Bedford Park and Gunnersbury Park conservation areas carry an additional Article 4 direction, removing some automatic permitted development rights around windows, doors, roofing and boundary treatments. If your home is in one of these two areas, budget extra time for anything that changes the building's external appearance.
For costs, payback and SEG export income, see the full solar guide. Chiswick-specific planning rules below.
Solar panels are permitted development on houses and flats in Chiswick — including inside conservation areas — provided:
For costs, running-cost comparisons against gas, and how the £7,500 grant works, see the full heat pump guide. The rest of this section covers what's specific to Chiswick.
Chiswick's narrow Victorian and Edwardian terrace plots make the 1-metre boundary rule the one that trips people up most — worth checking your side return before assuming a straightforward install.
This guide reflects published Hounslow Council planning policy; rules can change, and listed buildings or unusual plots may fall outside the general rules above. Confirm specifics with the council or your installer.