Airtightness work in old homes needs a full scope, not just a sealant price. Surveys, design, access and tests all affect the cost of reducing air leaks.
What will the survey and first test change in your price?
Airtightness In Existing Housing: Find What Needs Work
Check walls, floors, roofs and service routes. Mark spaces that could not be seen and allow for surveys or opening up where needed.
If a sample is used, show why it suits the other homes. Similar houses can have different faults, so update allowances when new facts arrive.
Define The Design And Trade Scope
Use the right design experts to deal with fresh air and moisture as well as leaks. State who designs, fits, tests and signs off the work.
Check joints at windows, roofs and floors and holes for services. Include access, making good and the handover files in the price.
Sealant is one line in the price. Have you covered the work around it?
- Find the gaps
Survey air leaks and record areas still hidden.
- Agree the scope
Link sealing, ventilation, access and making good.
- Test and refine
Use trial work and checks to update the method.
Use the trial results to refine the scope and labour allowance before repeating the work.
Test The Method Before Repeating It
In live homes, agree visits and room access before setting labour rates. Price protection and repeat visits where needed.
Use a trial zone and staged checks that suit the design. Record defects and fixes, then update the method and cost before repeating the work in more homes.
General guidance. Check your signed contract and the job facts. Get legal advice where needed.