No wall is marked as a party wall yet. A party wall joins a neighbouring home and usually loses very little heat — marking it gives a more accurate result. Select the shared wall and set its type to Party, or ignore if you'd prefer.
Unsaved changes
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New project · Customer
Step 1 of 2 — who and where
Optional — pulls the property's construction & heating from its Energy Performance Certificate as a starting point.
🔒 From the postcode · MCS lookup
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Enter the postcode on the previous step and we'll pick the nearest weather station.
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Semi-detached, terraced & flats share a party wall — you'll be reminded to mark it when you save.
Set the typical construction — you can fine-tune any individual wall, window or door later on the plan.
Occupancy sizes the hot-water cylinder to BS EN 12831-3 (≈ 40 L per person per day, more for High demand), then adjusted for the store temperature. You can change the cylinder, store temperature and reheat time later in the Plant tab.
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What we'll attach to help us fix this
Also attached: app version, your account, browser/device, and the last few error messages.
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Share proposal with customer
A private link — you choose what they see, no login needed
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Accept Administrator Alterations
An administrator has proposed changes to this design
An administrator has made changes to this design to help you. Accept to update your design to their version, or Reject to keep your current design and discard their changes.
Name this room
Pick a use — the MCS design temperature is set automatically