SM4 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 545 postcodes across 3 sectors in Merton.
Full fibre
0%
Gigabit
96%
Superfast
100%
Postcodes
545
SM4 is Merton's top performer, with 96% gigabit availability across 545 postcodes. This is among the highest gigabit concentrations recorded outside London's core.
Broadband speeds in SM4
Share of SM4 premises by the fastest download speed available, averaged across all 545 postcodes in the district.
Gigabit reaches 96%, an elite figure for any outward code. Superfast is 99.5%, near-complete coverage across SM4. The speed profile is strong: 96% of postcodes sit at 300+ Mbps, 3.6% occupy 30 to 300 Mbps, and 0.1% sit below 10 Mbps. This distribution reflects cable networks achieving near-saturation gigabit deployment in the Merton locality. Households in SM4 have a different experience from most UK postcodes: they can choose between gigabit providers rather than negotiate for basic access. Cable infrastructure provides all high-speed capacity.
Source: Ofcom Connected Nations. Percentages are district-wide averages of postcode-level availability, so rows may not sum to exactly 100%.
Connectivity in detail
Below 10 Mbps USO
0%
Premises unable to get the 10 Mbps universal service minimum
Fixed wireless
0%
Premises that can use a fixed wireless access service
Broadband by sector
SM4 splits into 3 postcode sectors. Coverage and prices can differ street by street, so open a sector below to find your exact postcode.
| Sector | Postcodes | Superfast | Full fibre | Gigabit |
|---|---|---|---|---|
| SM4 4 | 177 | 100% | 0% | 98% |
| SM4 5 | 157 | 100% | 0% | 97% |
| SM4 6 | 211 | 100% | 0% | 94% |
All SM4 4 postcodes (177)
All SM4 5 postcodes (157)
All SM4 6 postcodes (211)
Best deals
Compare broadband deals in SM4
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Living in Merton
SM4's 545 postcodes represent a focused suburban cluster. The 96% gigabit reflects dense cable investment or a particularly well-served area.
Crime per month
1
Average recorded crimes per local statistical area
Remote worker score
55/100
Connectivity and amenities for home working
Family score
54/100
Schools, safety and family amenities
Value score
50/100
What you get for the local price level
SM4 broadband FAQs
How common is gigabit in Merton?
In SM4, it is almost universal. 96% of postcodes support gigabit via cable. That is exceptional for any outward code.
Are there non-gigabit postcodes?
Only 4%. Those fall into the 30-300 Mbps range, still well above basic needs.
Isn't 96% unusually high?
Yes. SM4's 96% gigabit represents exceptional cable deployment. This concentration reflects dense suburban infrastructure built over decades.
Why no full fibre?
Cable has been deployed so thoroughly that fibre rollout may not have been economically justified here.
Neighbouring districts
Check your exact postcode
Every postcode in SM4 has its own page with broadband speeds, house prices, school ratings and crime stats. You can also compare providers for your address.
Data sources: Broadband data from Ofcom Connected Nations 2025 · House prices from HM Land Registry · Crime from Police.uk · See all data sources