Wall brackets are the ordinary fixing. A roof frame is a different product: feet or steels, a check that the roof can carry the weight and vibration, weathering so you do not puncture a guarantee, and a safe way up. In 2026 illustrations a simple wall bracket pair is a small line inside a normal install, while a flat-roof frame with proper feet, a structural look and safe access often adds high hundreds to low thousands. Survey the roof before you reject every wall. An F-gas certified company still connects the refrigerant. The installer who will not stand a condenser on rotten boards is the one to trust.
A solid wall and a pair of brackets
A solid masonry wall and a pair of anti-vibration brackets suit many houses. The outdoor unit needs airflow, a fall for its own drain in heating mode, and a position you can service. If that wall exists, use it. Roof mounting is for when walls are glazed, too weak, too close to a neighbour's window, or forbidden by a lease. A simple wall bracket is a small extra. A proper roof frame is not.
Feet, membranes and a roof warranty
Flat roofs, single-ply membranes and old decking do not automatically take a vibrating machine. Feet should spread the load. Fixings should not become leaks. A landlord or a roofing warranty may require their own approved detail. That conversation is part of the cost. Any flat roof does not automatically qualify. Load, vibration, warranty and drainage need a look. A rotten deck is a roof repair first.
What the frame quote has to include
Once you are fabricating or buying a frame, craning or carrying a unit upstairs, and paying a roofer to keep the membrane honest, the extra is commonly high hundreds and can reach the low thousands, before scaffold.
- Prefer a sound wall when one exists.
- Roof work needs structure, weathering and access.
- Anti-vibration mounts are part of the frame, not a luxury.
A welded pitched-roof steel at the dearer end
A pitched-roof steel that a fabricator welds is the dearer end. Quotes that say roof brackets are included for the price of wall brackets are guessing. Ask for the frame type, who signs for the roof, and what happens if the deck is decayed when they open it. Service clearance on a roof is easy to forget and essential.
Noise into a loft bedroom, and water on the roof
A roof can be a good acoustic place or a drum. Lightweight loft conversions transmit fan noise into bedrooms. Isolation and a position over a gable, not over a bed, are survey items. Planning Portal heat pump rules still apply to plant on a roof. Listed and flat roofs often need consent that a rear wall bracket might have simplified. Heating mode produces water at the outdoor unit. On a roof that water must leave without pooling at a foot or icing a walkway. The refrigerant pipe drop into the building has to be weatherproof.
Who stands over the flashing
GOV.UK F-gas work is the connection and charge. The roofing work is whoever can stand over their flashing. Hire both with one responsible quote if you can. Whoever detailed and fitted the penetrations should be named, which is why a vague line that a builder will finish is a gap. HSE work at height guidance still applies to getting onto that roof. Energy Saving Trust describes the air-to-air heat pump you are lifting up there. Add a modest bracket allowance inside an ordinary ground or first-floor wall job, and do not pretend a roof frame is that line.
Frequently asked questions
Are roof brackets a small extra?
A simple wall bracket is small. A proper roof frame with weathering and access is often a high-hundreds to low-thousands illustration in 2026.
Core buying guides
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How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.