Townhouse Wi-Fi: Tall, Narrow and Full of Dead Spots

A townhouse gives you the floor area of an ordinary house stacked in a column about 18 feet wide. On any one floor the longest path is 40-odd feet, mostly through open doorways, so horizontal placement barely matters. Your Wi-Fi has to travel up and down instead — through two or three floor assemblies — and the only genuinely open path between levels is the stairwell.

Plan around that and a townhouse is easy. Ignore it and you end up with an extender on the middle floor that helps nobody.

Why a townhouse is not a small two-story house#

A typical townhouse is 16 to 22 feet wide and 30 to 45 feet deep: 500 to 900 square feet per floor across two, three or four levels. The longest line on one floor is 35 to 45 feet, and 5 GHz stays usable to roughly 50 to 75 feet indoors through an ordinary wall or two — so a 40-foot run across one level is survivable. The longest line in the building is vertical: 20 to 33 feet from the entry level to the top bedroom, and that path pays the same loss plus every floor it crosses.

Those are rules of thumb, not readings from your building; the per-material breakdown is in what each building material costs you in dB. Two wood floors and 25 feet of height leave the top bedroom in the -70s even with a good router. Two concrete planks push it past -85 — not a weak room, no room at all. That is why the far bedroom on the same floor works fine and the bedroom two floors up does not.

The router is on the wrong floor, and the builder chose it#

Almost every townhouse brings the coax or fiber in at the ground floor — the garage, the entry closet, the space under the stairs. Nobody picked that spot for coverage; the contractor picked it for the shortest trench. So the transmitter sits at the bottom of the stack, often in a closed cabinet, with every living floor above it.

In a townhouse the router belongs on the middle floor, near the stairs. That is usually the kitchen and living level, and it leaves the top and bottom floors one floor away instead of three. Moving it there typically buys the top floor 10 to 20 dB — the same order of gain a well-placed extender delivers, for the price of a cable. If the entry point traps you downstairs, leave the modem or ONT where it is and run one Ethernet cable up the riser. How to choose the new spot is in the router placement guide.

The stairwell is the only vertical aperture you have#

Floors are continuous barriers. The stairs are the hole in them. A path through the open stair void loses almost nothing; the same path two feet to the side pays the full 6 to 30 dB for the floor assembly.

That reverses the usual instinct. On an 18-foot-wide floor, an outlet 20 feet from the stairs with a clear view of the void beats one 10 feet away behind the bathroom stack. Being central means little on a floor this narrow; being in line with the opening is everything.

• Half-landings win. Townhouse stairs are usually a switchback with a landing halfway between floors. That landing sees both levels through the same void; an outlet there is the best extender position in the building.
• Doors close the aperture. A solid-core door at the foot of the stairs, or the fire door between garage and living space, costs 4 to 6 dB and removes the free vertical path. If it is normally shut, plan as if the void were not there.
• Stack the gear near the stairs. Vertical stacking works because the stairwell sits directly above the stairwell, not because the floor plans line up.

Vertical placement in general is covered in the two-story house guide, and node stacking in three-story placement. What is specific to a townhouse is that there is no horizontal alternative.

Party walls, neighbors, and what an extender makes worse#

You share one or two walls with people whose routers are 15 feet from your couch.

A real party wall is a decent shield. But a row of six to ten units puts many radios within one or two walls of you, and 2.4 GHz has only three genuinely non-overlapping channels. End units get off lightly; a middle unit is squeezed from both sides.

Coverage problems are local — one room is bad at all hours. Neighbor problems are temporal — the signal reading barely moves, but everything crawls in the evening. That second pattern is not an extender problem; the fix is channel and channel-width choice, covered in Wi-Fi congestion from neighbors.

Do not mount the router or extender flat against a party wall either. Half the pattern goes into your neighbor's living room and comes back as nothing.

A floor-by-floor plan for a three-over-one#

Take a common case: 18 feet wide, 42 feet deep, 1,850 square feet. Garage and utility at grade, living and kitchen above, bedrooms on the third floor, a primary suite on the fourth — three living floors over one service floor. The router is in the ground-floor entry closet and the complaint is the top floor. Work in this order and stop as soon as it is fixed.

1. Move the router to the living floor, within about 10 feet of the stair opening, at waist height or higher, on an interior wall rather than a party wall, and out of any cabinet.
2. Retest for a full day before buying anything. In three-level townhouses this step alone often ends the complaint.
3. If the top floor is still weak, add one extender or mesh node on the floor below it, at the landing, within roughly 6 feet of the stair opening — the last spot where the router still reads about -60 to -67 dBm.
4. If the garage or ground floor is the remaining problem, run it as a second leg from the router. Never chain a second extender off the first: each single-radio hop roughly halves throughput, so a 400 Mbps plan arrives at the fourth floor as 100 Mbps or less.
5. Test in the problem room, doing the thing that annoyed you — the video call, the 4K stream — not standing next to the extender.
6. If it improved by only 2 or 3 dB, move the unit one outlet toward the router and retest. If that does not help, the vertical path is closed and you need a wire, not a repeater.

When to stop and run a cable#

• The router is stuck in a garage behind concrete plank and a fire door. Nothing upstairs gets a clean link back. Run Ethernet or MoCA up the riser and put an access point on the living floor.
• Four levels, one router. Two hops leave a quarter of your throughput. Two independent legs, or a wired node per floor, is the design that works.
• Concrete-plank floors throughout. Stack 20 to 30 dB per level and the vertical path is closed; one wired access point per floor is the honest answer.

An extender earns its place when the floors are wood-framed, the stairwell is open, and there is an outlet on the landing one level below the dead floor. Check all three before you spend anything.

Comparing outlets on different floors, on paper#

A townhouse is awkward to survey on foot, because the comparison that matters is between outlets on different floors and you cannot stand in two places at once. That is the gap a simulated stack closes. Sketch each level in Range Up, choose the material preset that matches the construction and raise the floor loss where the decks are concrete plank, mark the router's real position, and the heatmap comes back for every level at once. Every floor, both canvas views and the heatmap itself are free; the Premium half is dropping extenders in and reading the Before / After gain. Name the bedroom that fails, and the placement search works its way through the possibilities on every level, ordering them by what each does for that one room and painting the best of them over your coverage as it stands. It models the drawing you gave it; it does not read your live network.

The negative answer is often the valuable one: if moving the router up a floor gains the top bedroom 15 dB and an extender gains it 4 dB, the cable wins and you keep the money. Plan the stack before you buy; the extender placement guide covers what to do with the result.