Websites for drainage firms in Cardiff that work to the Welsh rules.

Dwr Cymru Welsh Water is the sewerage undertaker for Cardiff, and Cardiff Council is the SuDS Approving Body under Schedule 3 of the Flood and Water Management Act 2010, which commenced in Wales on 7 January 2019.

We build a page per service, an area page for Roath, Grangetown, Cathays and Ely, and a Welsh rules page. The Valuation Office records 166,780 properties in Cardiff, 23.8 per cent of them built before 1919. See it live before you pay a penny, live in 7 days.

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All drainage websites

The houses in Cardiff

The published Valuation Office stock table CTSOP4.1, stock at 31 March 2025, records 166,780 properties in Cardiff. 23.8 per cent were built before 1919 and 36.5 per cent before 1940. 22.4 per cent went up between 1945 and 1972, 21.0 per cent between 1973 and 1999 and 20.1 per cent since 2000.

Census 2021 table TS044 records 29.7 per cent of households semi detached, 29.6 per cent terraced and 14.1 per cent detached, with 20.2 per cent in purpose built flats and 5.0 per cent in converted flats, a combined 25.2 per cent. Table TS054 records 22.2 per cent renting from a private landlord or letting agency and 17.1 per cent renting socially. Cardiff is a Welsh unitary authority and the published row covers the city.

We would build the terraced inner city, the bay and the outer estates as separate pages, and put a landlord and agent page beside them carrying your reporting and invoicing.

Roath

92.5 per cent built before 1919 (VOA CTSOP4.1, MSOA row). The 22.2 per cent private rented share (Census 2021 TS054) is a whole authority figure rather than a figure for this area.

A page on services for homeowners, landlords and agents.

Grangetown North

84.0 per cent built before 1919 (VOA CTSOP4.1, MSOA row).

A quote route that asks for access details and explains how a quotation is prepared.

Cathays North

82.1 per cent built before 1919 (VOA CTSOP4.1, MSOA row).

A page setting out invoicing and reporting for landlords and agents.

Bay and Butetown

83.2 per cent and 62.9 per cent built since 2000 (VOA CTSOP4.1, MSOA rows).

A page on managed buildings, written only where you take that work.

Ely East and Ely West

90.7 per cent and 48.3 per cent built between the wars (VOA CTSOP4.1, MSOA rows).

A completed local job with its scope explained.

The rules that change a drainage job in Cardiff

Schedule 3 of the Flood and Water Management Act 2010 commenced in Wales on 7 January 2019. Surface water drainage on new development must be built to the statutory national standards published by Welsh Ministers and approved by the local authority acting as SuDS Approving Body, with construction work covering less than 100 square metres excepted from the requirement for approval (Welsh Government, sustainable drainage systems guidance). Cardiff Council is the approving body and states it has seven weeks in which to determine an application, or twelve where an Environmental Impact Assessment applies.

The transfer on 1 October 2011 covered qualifying private sewers and lateral drains connected to the public sewer system by 1 July 2011, in Wales as in England (gov.uk, the private sewers transfer regulations). Responsibility for an individual pipe should be checked with Dwr Cymru Welsh Water.

Welsh Water states that extending a home over or within three metres of a public sewer or lateral drain must be notified, and gives two routes: self certification, which it states is confirmed by an approval notice by email within three days of submission, after which work can start, or a full application where the criteria are not met. It adds that an application is unlikely to be accepted where the sewer's internal diameter is larger than 225mm or the pipe is deeper than three metres.

We would explain how you check the SuDS approval, the build over route and the proposed work before confirming whether permission is needed.

The local field, 16 September 2026

Who you are up against in Cardiff

We counted the Google Maps results for drainage companies in Cardiff on 16 September 2026. The sample was 40 listings: 35 had a website and 5 had none. Five are a drainage service with a Cardiff address and one is a national franchise branch. Four are merchants or suppliers, and the rest are groundworkers, landscapers, gutter cleaning firms, paving contractors, engineers, a damp specialist and a trade body's corporate office.

That is one dated sample of one search. What we would do with it is give Roath, Grangetown, Cathays, the bay, Ely and Llanrumney a page each, carrying work you have finished in them.

Where a drainage firm in Cardiff gets to when they invest

Three Cardiff firms appeared in the first ten Google local listings we checked for "drainage companies in Cardiff", with sites worth opening. One gives testimonials and a gallery their own places in the navigation, and another splits domestic and commercial work in the menu.

  • City Drains

    Built on Wix. It carries photographs of its own jobs and reviews on the page. It has no page per area. Quotes come through a form, and the phone number sits in the header.

    It gives testimonials and a gallery their own places in the navigation.

  • Drainmen Ltd

    It carries a page per area. Quotes come by phone, and the phone number sits in the header.

    The number and a Call Now button sit at the top of the page, and the menu is five named jobs rather than a services drop down.

  • Daily Drains

    Built on WordPress. It carries a page per area, photographs of its own jobs and reviews on the page. Quotes come through a form, and the phone number sits in the header.

    It separates domestic and commercial services in the navigation, and puts pricing on its About page.

All three keep the phone number in the header, both of the two we could check carry reviews on the page, and two run a page per area. Each one opened and checked 16 September 2026.

The Cardiff searches worth their own page

  • "blocked drain Cardiff"

    110 searches a month (OpenSEO keyword data, September 2026)

    The emergency page, with the number fixed to the screen and the districts you reach under it.

  • "drain unblocking Cardiff"

    110 searches a month (OpenSEO keyword data, September 2026)

    A page of its own for the booked job, with the access questions asked before anyone drives out.

  • "CCTV drain survey Cardiff"

    10 searches a month (OpenSEO keyword data, September 2026)

    A survey page with a still from the camera and a sample report on it.

  • "drain clearance Cardiff"

    10 searches a month (OpenSEO keyword data, September 2026)

    It sits on the landlord and agent page, with your reporting and invoicing on it.

  • "drain repairs Cardiff"

    10 searches a month (OpenSEO keyword data, September 2026)

    Repairs and relining on one page, linked from the survey page where the fault is found.

  • "emergency drain unblocking Cardiff"

    no recorded monthly volume (OpenSEO keyword data, September 2026)

    It joins the emergency page rather than taking a second one, with your out of hours arrangement stated.

Of the six phrases shown, five carry a volume. Emergency drain unblocking Cardiff returned no recorded monthly volume.

What we would build for a Cardiff drainage firm

  • A home page naming Roath, Grangetown, Cathays, Butetown, Ely and Llanrumney.
  • A blocked drain page built for the phone.
  • A drain unblocking page beside it for the booked job.
  • A CCTV survey page with a still from the camera and a sample report.
  • A repairs and relining page linked from the survey page.
  • A Welsh rules page on the SuDS Approving Body and the Welsh Water build over route.
  • Area pages for Roath, Grangetown, Cathays, Cardiff Bay, Ely and Rhiwbina.
  • A quote tool that asks what is blocked, how urgent it is, house or business, and takes a photograph.

What every drainage site needs, whatever the town, is on our drainage companies page.

Drainage companies in Cardiff ask us

  • Does a Cardiff drainage site need to say anything an English one does not?

    Schedule 3 of the Flood and Water Management Act 2010 commenced in Wales on 7 January 2019. Surface water drainage on new development must meet the Welsh national standards and be approved by the council acting as SuDS Approving Body, with construction work covering less than 100 square metres excepted from the requirement for approval. The page would quote that and link to it.

  • What is the build over route here?

    Dwr Cymru Welsh Water runs two. Self certification, which it states is available where the published criteria are met and is confirmed by an approval notice by email within three days, or a full application where they are not. Welsh Water adds that an application is unlikely to be accepted where the sewer is larger than 225mm internally or deeper than three metres.

  • Should the site speak to landlords or to homeowners?

    Census 2021 records 22.2 per cent of Cardiff households renting from a private landlord or letting agency. The Valuation Office records 92.5 per cent of Roath properties and 82.1 per cent of Cathays North properties as built before 1919. We would write for homeowners, landlords and agents on separate pages.

Where these Cardiff facts come from

What your drainage website includes

Or see everything we do.

We build your drainage site first, put it on a real address and send you the link. No deposit, no contract to read, nothing monthly at the sale.

  • Free live demo. We build your site first and put it on a real address. You open it on your phone before any money changes hands.
  • Keep your domain. Your domain stays in your name. So does the site once it is paid for.
  • Live in 7 days. Seven days from sign off to a site that is live and taking enquiries.
  • One firm per area. We build for one firm per trade per area. When an area is claimed it is gone.

99 out of 100 on Google's mobile speed test, measured on 15 September 2026. Run the test yourself.

This is the quote tool we put on your drainage site

This is the drainage version of the tool, exactly as it ships. Play with it as your customer would.

Show it for:
Step 1 of 5, about a minute

What's the problem?

Tap the closest match.

How urgent is it?

An honest answer helps with scheduling. Same day on emergencies.

What kind of property?

Helps us work out the likely drain layout.

Please enter a valid UK postcode.

Got photos of the drain?

Optional. A shot of the standing water or the open chamber tells the engineer a lot.

Add photosTap to choose from your device

Used only to scope the quote. Nothing is sent in this demo.

Where do we send the quote?

In a real build this lands in the engineer's inbox.

Sorted.

The engineer will reply within one working day. That is what your customer would see.

Reference
Service
Property
When
Area
And this is what you get

New lead in your inbox.

See it live

Nothing is sent here. It is a working demo of the tool we build into every site.

Other towns we have opened for drainage companies

Want to see your own drainage site in Cardiff before you decide?

Send us your firm's name and the areas you cover. We build it and send you the link. One firm per trade per area.

See it live Call 0161 567 6029
  • Free live demo
  • Keep your domain
  • Live in 7 days