Three of every four WiFi callouts I do in London are in pre-1930s housing. The same conversation: "We've got a really fast broadband line. The WiFi works in the living room. Step into the hallway and it dies."
It's not your router. It's the building. Here's what's actually going on, and the four fixes in order of how well they work.
Why Victorian houses kill WiFi
Three things conspire against you in a London terrace built between 1840 and 1910.
The walls. Victorian internal walls between principal rooms are usually solid — single-skin London stock brick with lime mortar, often plastered with horsehair lime plaster on both sides. The external walls and party walls are double-skin. That's 9 inches of brick plus plaster. WiFi at 5GHz barely makes it through a 4-inch stud wall, never mind a foot of masonry.
The ceilings. Lath-and-plaster ceilings (the original Victorian construction, replaced in newer plasterboard refurbs) often have wire-and-cement mesh between the laths for fire resistance. That mesh acts as a tiny Faraday cage to the WiFi above. Same goes for the original metal grilles in some chimney breasts and the wire-reinforced glass over stairwells.
The layout. Three or four storeys in a London terrace stack the rooms above each other. The kitchen is in the basement or rear extension. The router lives by the front door because that's where the master socket is. From the router to the third-floor bathroom is maybe twelve metres of straight-line distance — through five intervening floors and walls.
David and Priya in Clapham were the textbook case. Edwardian terrace, three floors. The BT Smart Hub was in the hallway, near the master socket where the dropwire enters the building. WiFi reached the kitchen at the back of the ground floor — just — and died completely upstairs. They'd tried two different mesh kits before they called me. Neither worked.
The reason: the floor between the ground floor and first floor is original Victorian construction — solid wood joists, tongue-and-groove boards, lath-and-plaster ceiling below with wire mesh, plus the gap is full of original lime-soaked horsehair sound insulation. Mesh nodes need to see each other on radio. The two floors are basically opaque to 5GHz signals.
I ran Cat6 up through the old bell-wire channel in the hallway riser to the first-floor landing, then on into the back bedroom on the second floor. Two Ubiquiti access points, ceiling-mounted, hardwired. Killed the Smart Hub's WiFi entirely. Full coverage from the basement kitchen to the loft conversion at -50dBm minimum.
Half a day's work. They said they'd been "living with it" for two years.
Fix 1: Move the router (sometimes solves it on its own)
The master socket is by the front door, but your router doesn't have to be. A 10-metre Cat6 patch lead (or a longer fibre lead for FTTP) from any decent supplier is all you need. Plug it into the router's WAN port, run it along the skirting to a central location in the house — the bottom of the stairs, the middle of the ground floor — and put the router there.
You'll be amazed how often that fixes 70% of the problem. The router was emitting WiFi just fine; it was just emitting it in entirely the wrong place.
The downside: cable visible along the skirting until you get it run properly through the wall. The upside: takes ten minutes, gives you the data to decide if you need more.
Fix 2: Powerline adapters (mostly a disappointment)
Powerline adapters use your house's mains wiring to carry data between two plug sockets. In theory, brilliant — no cables to run, plug-and-play. In practice, in a Victorian house, almost always a disappointment.
The Victorian wiring isn't on a single ring main. It's been added to in waves over a hundred years — first a 1930s upgrade, then a 1960s addition, then a 1990s rewire that may or may not have linked it all up properly. Powerline adapters need both plugs to be on the same electrical circuit. If they're not, speed drops by 70% or the connection just doesn't work.
I tell customers to skip powerline adapters and go straight to a mesh kit instead. Much better odds of working.
Fix 3: Mesh WiFi (works in ~60% of cases)
A mesh system is two or three small router-like devices that talk to each other over WiFi and form a single network. Modern ones (eero, TP-Link Deco, Netgear Orbi) are easy to set up and genuinely good. They solve the WiFi dead-zone problem in most London properties.
In Victorian terraces, the limit is whether two adjacent mesh nodes can see each other on radio. If you can put a node on each floor in the central stairwell where there's a visual line-of-sight through the stairwell void, mesh works well. If your stairwell is enclosed (a lot of conversions have boxed-in stairwells), the mesh fails for the same reason your WiFi was failing in the first place.
Try mesh first if your stairwell is open. It's the simplest reasonable solution. If you've already got one and it's not working — that's when you escalate to Fix 4.
Fix 4: Hardwired access points (works every time)
The proper solution, and what I install in any Victorian house where it makes sense: run Cat6 ethernet from the router to one or two dedicated WiFi access points, mounted on ceilings or high on walls, and turn off the router's own WiFi entirely. The router becomes a gateway only; the APs do all the radio.
The access points talk to your devices over WiFi at full speed, then send the data back to the router over the cable. No radio between buildings, no shared bandwidth, no contention. Coverage is dictated by where you put the APs, not by where the master socket happens to be.
The bulk of the work is the cable run. A typical three-floor Victorian terrace needs two access points — one on the first-floor landing ceiling, one on the second-floor landing ceiling — and one Cat6 run feeding both via a small ceiling-mounted PoE switch. That's a half-day install for the cable, the kit and the configuration.
Once it's in, it stays in. The only software updates are firmware on the APs, which happen automatically. Coverage doesn't degrade. Speed doesn't drop when neighbours' WiFi gets busier. It's the install I'd want in my own house — and is, in fact, the install I have in my own house.
What I recommend, by property type
- Ground-floor flat in a Victorian conversion: Move the router (Fix 1) is often enough. If not, mesh (Fix 3) usually works because everything's on one floor.
- Two-storey Victorian maisonette: Mesh works about 70% of the time. If your stairwell is enclosed and the kitchen is in the back extension, you'll probably need one hardwired AP — but only one.
- Three-storey Victorian or Edwardian terrace: Default to hardwired APs (Fix 4). Two APs, sometimes three if you've got a loft conversion. Mesh can be made to work but you'll fight it.
- Mansion block flat: Move the router. Mansion blocks are usually one floor and signal works fine if the router is centrally located. The internal walls are usually thinner than the externals.
The thing every other WiFi guide gets wrong
Most articles on this subject tell you to "upgrade your router." This is occasionally helpful (an ISP-supplied router from 2014 will be on WiFi 4 / 802.11n and worth replacing). Mostly it's not. The router is not the bottleneck in 90% of these jobs — the walls are. Replacing a WiFi 5 router with a WiFi 7 router won't help your signal go through a 9-inch brick wall any better.
The honest order of operations: move the router first, try mesh, then install hardwired APs. Don't keep buying more routers.
Common questions
Will a mesh WiFi system fix my Victorian terrace?
Maybe. Mesh works when two nodes can see each other on radio. In open-plan or one-floor properties it almost always works. In three-storey terraces with enclosed stairwells, it usually doesn't. Hardwired access points work in every property.
What about WiFi extenders from Argos?
Cheap WiFi extenders halve your bandwidth at the extender because they receive and re-transmit on the same channel. They also need a strong signal from the router to work — and in a Victorian house, the strong-signal area is precisely the area that doesn't need an extender. Not worth the effort in most cases.
Why is the master socket always in the wrong place?
Because in 1965 the GPO installer put it by the front door — that's where the drop-wire entered the building. The household phone lived there for forty years. Now we use WiFi from every room, and the master socket is by the front door, which is approximately as far from the kitchen and bedrooms as it could physically be. Moving the master socket (or just moving the router away from it) solves a surprising amount.
Can I install access points myself?
If you're handy with a drill and comfortable terminating Cat6, yes. The kit is consumer-grade now (TP-Link Omada, Ubiquiti UniFi, Aruba Instant On). The hard part is the cable run — fishing Cat6 through Victorian floor voids without damaging anything is the bit that takes practice. If you've not done it before, you'll spend a Saturday on it and probably damage a ceiling.
Got a Victorian house with patchy WiFi?
Ring me with the address postcode and the layout (number of floors, where the master socket is, where you're losing signal). I'll give you a real recommendation on the phone — mesh, hardwired, or sometimes just "move the router and call me back in a week."