South East London's largest borough by area, with established period housing and demand for roof replacement and general repairs. Bromley falls well within the South East London ground Lian Construction covers on a regular basis. For rear, side-return, wraparound and two-storey house extensions with structural engineering and Party Wall compliance in Bromley, that local knowledge means fewer surprises once work is on site and a team that already understands the borough's typical property stock.
Bromley is South East London's largest borough by area, and that scale shows in the range of period housing across it. Expect a good deal of Victorian and Edwardian terraced and semi-detached houses in the more established residential pockets, alongside a substantial stock of 1920s and 1930s suburban semis, which is typical of outer London boroughs that grew up around expanding rail links in that era. There are also pockets of larger interwar and postwar detached houses, plus some later 20th-century infill and estate development filling in the gaps between older neighbourhoods. Roofs, chimneys, brickwork and rainwater goods on this older stock are now well past their original design life in many cases, which is a big part of why roof replacement and general repair work is in steady demand across the borough. Because Bromley covers such a wide area, the age and condition of housing can vary a lot street to street, so it is worth getting a property looked at individually rather than assuming what worked next door applies to your own roof or structure.
Given how much ground Bromley covers as London's largest borough, demand for roofing and general repair work is spread thinly across a wide area rather than concentrated in one or two hotspots. That has practical implications for homeowners: it can be harder to find a contractor who is genuinely local to your specific part of the borough and willing to travel efficiently, and lead times can stretch out during busy periods simply because tradespeople are covering more ground between jobs. With so much established period housing, a lot of the work coming through is reactive, roof repairs after storm damage, ongoing maintenance on ageing chimneys and guttering, and general fabric repairs on houses that were not built with modern weatherproofing standards in mind. For homeowners and landlords, this usually means being proactive pays off: getting a roof or exterior condition checked before a leak forces an emergency call tends to be cheaper and less disruptive. It is also worth asking any contractor how familiar they are with the specific area of Bromley you are in, since access, parking and the age profile of housing can differ quite a bit across such a large borough.
Given the amount of established period housing across Bromley, it is worth checking early whether a property sits within a conservation area, as is the case in parts of many outer London boroughs with older housing stock. This can affect what is permitted for roof coverings, chimney alterations, and visible external repairs, sometimes requiring like-for-like materials or additional consent even for straightforward repair work. Not every period property will be affected, and many repairs fall under permitted development, but it is not something to assume either way. If a property is listed or in a conservation area, it is sensible to confirm requirements with the local planning authority before work starts, since retrospective consent issues can cause delays and added cost. A contractor experienced with older properties should be able to flag likely restrictions early, but the homeowner remains responsible for confirming planning status.
Party Wall etc. Act 1996 on a Shared Terrace or Semi
If your extension involves a shared party wall - which almost every Victorian or Edwardian terrace or semi-detached extension does - or excavation within 3m or 6m of a neighbour's foundation depending on how deep your new foundations go, the Party Wall etc. Act 1996 requires you to serve formal notice before work starts. For work directly on the party wall itself you need two months' notice; for adjacent excavation it's one month. If your neighbour doesn't respond or dissents, you end up in a schedule of condition survey and a formal Award process with a party wall surveyor. Party wall surveyor cost in London typically runs £900-£2,000 where both sides agree a single surveyor, rising to £2,000-£3,000+ if each side appoints their own. This cost is borne by you as the building owner carrying out the works, not split with the neighbour. Starting groundworks before the notice period has run, or without an Award in place where one's needed, leaves you exposed to an injunction that can stop the job entirely and is one of the most common causes of a stalled extension in London. On extension jobs we serve the notices and coordinate the surveyor as part of the build programme, rather than as an afterthought once excavation is already close to the boundary.
How Long a London Extension Takes, Start to Finish
From first site visit to final sign-off, the pre-construction phase - the measured survey, design, structural engineering, deciding the planning route, the Building Control submission and any Party Wall Act notice period - commonly takes in the region of 2-4 months before groundworks even start, and this is where projects most often get compressed unrealistically in initial planning. Once on site, a straightforward single-storey rear extension under permitted development with a Building Notice typically runs somewhere around 12-16 weeks as a planning guide, once the design is settled and the structural engineer's calculations are in hand, though exact timing depends on your specific design and site conditions. A side-return or wraparound extension on a terrace usually adds a further 2-4 weeks to that build programme because of the underpinning work to the party wall foundation and the narrower access for materials and skips. A two-storey extension typically runs longer again, in the region of 16-22 weeks on site, because of the additional floor structure, the roof tie-in at first-floor level, and doubled first and second fix. None of these figures include a full planning application if one's needed, which can add roughly 8 weeks or more before groundworks start - and the Party Wall Act's two-month notice period (one month for adjacent excavation) runs in parallel with design and Building Control preparation where it's handled properly, instead of being tacked on afterwards. Served at the same time as your Building Control application it costs you no extra time overall, but served late, or if a neighbour appoints their own surveyor and negotiations drag, it can add real weeks to a job that's otherwise ready to start. Weather affects roofing and groundworks stages more than any other phase, which is why we sequence those for drier months where the programme allows it.