Where we work
Ventilation and ductwork across South East London
The areas we cover, and what we tend to find in the housing stock in each of them.
We are a South East London firm and we work like one — most jobs are a short run from Beckenham, which is how we can get back out to a property quickly when something needs adjusting after commissioning.
Three of these have a page of their own, because there is enough that is specific to them to fill one: Beckenham, Bromley and Penge & Anerley.
Beckenham
Beckenham's mix of Victorian terraces and post-war extensions means we regularly deal with older ceiling voids that were never designed for modern extract runs. We route ductwork around period features while keeping airflow to current standards.
West Wickham
Many West Wickham homes we visit have had loft conversions or rear extensions added over the years, which can leave the original ventilation strategy outdated. We assess the whole property rather than just the room in question, so upgrades don't just move the moisture problem elsewhere.
Bromley
Bromley's larger housing stock and busier renovation market means Part F compliance comes up often when kitchens and bathrooms are being remodelled. We work alongside builders and homeowners to keep ventilation planning part of the project from the start, not an afterthought.
Chislehurst
In Chislehurst's more rural and detached properties, we often find longer duct runs and larger loft spaces, which change how MVHR systems need to be balanced and insulated. Cold-bridging around joists is a common issue we look out for on surveys here.
Dulwich
Dulwich's conservation areas and listed features mean ventilation upgrades often have to be discreet as well as effective. We plan duct routes and extract positions that meet airflow requirements without compromising the character of the property.
Penge & Anerley
Dense Victorian terraces, a lot of them converted into flats. Extract frequently cannot go out of the nearest wall — it has to reach a rear elevation or a party wall the freeholder has agreed to — so the duct route is worked out before anything is quoted, not after it is opened up.
Sydenham & Forest Hill
Hillside Victorian villas, most of them split into flats. Top-floor flats sit under cold roof voids, and an uninsulated duct crossing one is the first thing in the building to start dripping. We lag every outdoor run as standard here rather than as an extra.
Catford
1930s cottage estates and solid-wall stock, much of it double-glazed at some point without anything replacing the ventilation the building used to rely on. That combination is behind most of the condensation calls we take from this area, and it is usually fixable without touching the windows again.
Crystal Palace
Top-floor conversions under steep roofs, with terminal positions constrained by the conservation area. A roof cowl often has to become a discreet wall terminal instead, which changes the duct run and the pressure loss, so it gets designed in rather than improvised on the day.
Petts Wood & Orpington
1930s semis with generous lofts — the stock where a full heat recovery system is genuinely straightforward to install, provided the intake and exhaust runs crossing that cold loft are properly insulated. Get that wrong and the loft is where the condensation ends up.
Blackheath & Lee
Georgian and Victorian stock inside a conservation area, where the grille on the outside wall gets looked at as closely as the airflow figure. We choose terminals for how they sit on the elevation as well as for what they move, and say up front where one will be visible.
Eltham & Mottingham
Inter-war and post-war housing, a lot of it still ventilated by passive wall vents and an open kitchen window. It is usually the clearest case for continuous mechanical extract: modest cost, no redecoration, and a measurable change in the rooms that actually make the moisture.
Also covering
- Bickley
- Shortlands
- Hayes
- Keston
- Coney Hall
- Elmers End
- Eden Park
- Downham
- Grove Park
- Brockley
- Honor Oak Park
- East Dulwich
- Herne Hill
- Peckham
- Camberwell
- Lewisham
- Greenwich
- Sidcup
- New Eltham
- Shirley
- Addiscombe
- Croydon
- South Norwood
- Selhurst
Just outside all of that? Ask anyway — we travel further for larger installations and commercial fit-outs, and we would rather tell you straight away than have you keep looking.
Not sure where to start?
Send us a message with what you have noticed at home. We will tell you honestly whether you need a survey, a system, or neither.
Trained on the systems we install
Certificated — and here they are
Most trade sites show you a row of logos. These are the actual certificates, both sat in August 2026. Tap either one to read it, or download the PDF.
- Company no. 12092552 Registered in England & Wales. Trading as Cavalli Ventilation since July 2019, and in ventilation since 2003.
- Airflow measured on every install A calibrated anemometer at the grille, recorded and handed over. The only figure that counts is the one measured in your room.