Symptoms
- Signal is strong in the room with the router but drops sharply one room away
- Older homes or homes with plaster/brick walls have worse coverage than expected
- Basements and rooms behind bathrooms (tile/plumbing) are especially weak
- Signal improves noticeably with doors open
Likely causes
- CommonDense building materials blocking signal (brick, concrete, plaster, tile)These materials absorb and reflect Wi-Fi signals far more than wood or drywall.
- CommonRouter placed low, in a corner, or in a closetA router's antennas radiate signal outward and downward less effectively when boxed in or near the floor.
- PossibleMetal objects or large mirrors near the routerMetal reflects Wi-Fi signals and can create dead spots.
- PossibleSingle router trying to cover too large or oddly shaped a spaceOne access point has a practical coverage limit regardless of walls.
What to do
- Move the router to a central, elevated location, like a shelf in a hallway, rather than a corner or closet.
- Angle external antennas (if present) vertically for horizontal coverage, or in a mix of positions if coverage is needed on multiple floors.
- Identify which walls are the thickest or made of brick/concrete/tile, and consider whether the router can be placed on the more open side of the home relative to those walls.
- For persistent dead zones caused by construction materials, add a mesh node or access point on the far side of the problem wall rather than trying to push signal through it.
- Consider a wired connection (Ethernet over existing cabling, or powerline adapters) to place an access point in a hard-to-reach room instead of relying on Wi-Fi to reach it.
- Test coverage at different times, since some interference sources (like microwaves) are intermittent.
- If coverage remains poor despite repositioning, a whole-home mesh system is usually more effective than trying to boost a single router's range.
Tools and parts
- Smartphone to check signal strength
Mesh wifi system or powerline adapter kitSearch: “mesh wifi system powerline adapter”
When to call a pro
For older homes with dense walls, a low-voltage technician can run Ethernet cable to key rooms for the most reliable fix.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.