Accredited & Registered
ATTMA-accredited blower door testing across Leicester, Loughborough, Hinckley, Melton Mowbray, Market Harborough and Coalville. Housing, student accommodation and large-scale logistics units.
Same-week slots available across Leicestershire
Thanks — we'll confirm availability and pricing within one working day.
We make the air testing process as simple and stress-free as possible. Our ATTMA-accredited testers deliver fast, reliable results with clear pricing — so you can keep your project on programme without any surprises.
Whether it's a single self-build or a multi-plot development, we provide the same level of service: pre-test guidance, transparent quotes, and rapid turnaround on reports and certificates.
Leicestershire pairs sustained housing growth with one of the busiest logistics markets in the UK. New-build activity concentrates around Leicester city and its suburbs, the Lubbesthorpe development in Blaby, Loughborough and the wider Charnwood borough, Hinckley, and the market towns of Melton Mowbray, Market Harborough and Ashby-de-la-Zouch. Alongside that, Magna Park at Lutterworth, the M1 and M69 corridors, and the East Midlands Airport area around Castle Donington drive continuous warehouse and industrial construction. We reach the county via the M42 and M69 from our Worcester base and can combine visits to keep costs down on multi-site programmes.
Air tightness testing, also called air leakage testing or air pressure test, measures the amount of uncontrolled air escaping through gaps, poor seals, and penetrations in a building's envelope. It is expressed as cubic metres of air per hour per square metre of envelope area at 50 Pascals of pressure (m³/h.m² @50Pa).
Part L of the Building Regulations requires all new build residential and commercial properties in England and Wales to demonstrate an acceptable air permeability result as part of achieving building control sign-off. The result is also a direct input into your as-built SAP calculation. A poor result can push a dwelling below its compliance threshold.
Beyond compliance, a well-sealed building retains heat more effectively, reduces energy bills for occupants, and minimises the risk of condensation and moisture ingress through the building fabric. Air tightness is one of the highest-impact, lowest-cost improvements available during construction. The detail work costs little; a failed test and retesting does.
A typical single-dwelling test takes around 90 minutes on site. We work with your site team to minimise disruption and move efficiently through the process.
The most common cause of a failed air test isn't poor construction — it's poor preparation on the day. Unsealed service penetrations, open trickle vents, and incomplete mastic around window reveals are the usual culprits, and all are fixable before we arrive.
We provide all clients with a pre-test preparation checklist at the point of booking. For larger developments, we strongly recommend a pre-test inspection once the building is watertight but before internal finishes are applied — at that stage, any leakage paths are still visible and accessible, making remediation cheap and fast.
For projects targeting very low air permeability (under 3 m³/h.m²), or those pursuing Passivhaus certification, early-stage pressure testing during construction is standard practice. We can advise on a testing programme appropriate for your project.
Part L air tightness testing across Leicestershire for new builds, conversions, student accommodation, and commercial developments.
We also cover: Worcestershire, Birmingham & West Midlands, Warwickshire, Gloucestershire, Bristol & Somerset
Pricing starts from £95+VAT for a single dwelling. Projects across Leicestershire including Leicester, Loughborough, Hinckley, Melton Mowbray, Market Harborough, and Coalville are quoted based on the number of units, construction type, and location.
There are no hidden fees — the quoted price includes travel, the test, and the compliance certificate or failure report.
If the result exceeds your compliance target, we provide a written report identifying the most likely causes of the excess air leakage and recommended remedial actions. Common causes include unsealed service penetrations, gaps around loft hatches, poorly sealed window reveals, and incomplete floor-to-wall junctions.
Once remediation has been carried out, a re-test is arranged. We try to accommodate re-tests quickly to minimise delays to your completion programme.
Your air permeability test result is a required input for the as-built SAP calculation. The design stage SAP will have assumed a target air permeability value — if your tested result is worse than that assumed value, the as-built SAP score will be lower, and may push the dwelling below its compliance threshold.
This is why we always check your design stage SAP assumptions before testing. If there is a risk of non-compliance, we flag it so you can investigate potential remediation before the formal test is conducted.
Yes. We test residential buildings under Part L Volume 1 and commercial buildings under Part L Volume 2. Leicestershire has one of the largest logistics and distribution markets in the country — Magna Park at Lutterworth, the M1 and M69 corridors, and the East Midlands Airport area around Castle Donington all generate continuous warehouse, industrial and office construction.
Commercial permeability requirements are set at 10 m³/h.m² by default, but your SBEM calculation may require a tighter target. We confirm the applicable target before testing.
Yes. We cover the whole of Leicestershire including Leicester, Loughborough, Hinckley, Coalville, Melton Mowbray, Market Harborough, Ashby-de-la-Zouch, Lutterworth, Oadby, Wigston, and Shepshed. We reach the county via the M42 and M69 from our Worcester base and travel through it regularly, so multi-site visits can usually be combined.
Leicestershire sits within our wider Midlands service area, reached directly via the M42 and M69. We typically have same-week availability and can often group visits with other East Midlands sites to keep travel costs down. Contact us on 01386 365145 to check current availability.
Yes. For projects with a tight permeability target, or where the client wants confidence before the formal test, we can carry out a pre-test inspection and informal pressure check during construction — typically once the building is plastered and before floor finishes are laid.
At this stage any leakage paths are still accessible, and remediation is straightforward and inexpensive. This is particularly valuable on Passivhaus or near-Passivhaus projects, or on first-of-type plots on a larger development.
Tell us your project type and location and we'll confirm availability, pricing, and your SAP design permeability target — all before you commit.