We’ve built a property management tool for small landlords
Hello Property118 readers: I’m William Harford. I co-founded Harthing with Neil Carthy and Adam Saul.
We’ve built a property management platform specifically designed for landlords with small portfolios that they’re self-managing, and are trying to keep up with the endless stream of new regulations and tax requirements www.harthing.co.uk.
Between us, we have over 50 years in financial services, two chartered accountants, a Cambridge mathematician building the platform, and Adam is even a director of Rochdale AFC. All three of us are landlords who self-manage. We built this because the tools available for someone managing one or two properties without a letting agent appear to have gaps helpful to landlords.
We have tried to build something that is intuitive and helps landlords deal with this increased burden of maintenance, compliance, finances, and documents in one place, everything timestamped and Making Tax Digital categorised.
The idea is that your records should prove you’ve been managing your property properly, and producing that proof shouldn’t require an archaeology project through your inbox.
What’s live when we launch on 12 May:
• Property records, maintenance logging, compliance tracking, document storage
• Financial transactions categorised for MTD from the point of entry
• Immutable Accountability Record — every action hash-chained, nothing editable or backdatable
• Evidence Bundle — one click, full chronological proof of everything you’ve done for a property
• Compliance dashboard with expiry alerts
It does use AI, and it reads your gas cert and pulls the expiry date, so you don’t have to type it. It doesn’t have a name badge, and it doesn’t offer opinions.
I have three questions for readers:
1 – Where do you actually keep your gas safety certificates right now, and could you find one in under two minutes if someone asked?
2 – With MTD now live, Section 21 going on 1 May, and Awaab’s Law on the horizon, do the tools that exist feel adequate?
3 – Did you know you’ve got until 31 May to serve the official GOV.UK Information Sheet to every existing tenant, or it’s a £7,000 fine?
I am happy to answer questions about what we’ve built, and happy to be told we’ve missed something obvious.
Many thanks
William Harford
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Member Since April 2026 - Comments: 2
3:03 PM, 28th April 2026, About 3 weeks ago
Hi William,
Shawn here — I built Doorkeep (doorkeep.co.uk), which sits in a similar space. Good to see more people building for the small landlord rather than just reskinning accountancy software.
To answer your three questions honestly:
1. Gas certs are in a folder on my Google Drive, and no, I probably couldn’t find the right one in under two minutes.
That’s exactly why I built compliance tracking with expiry alerts into Doorkeep — it’s the thing landlords don’t think about until they get the phone call.
2. The tools that exist are either too expensive for someone with 1-3 properties, or they focus on one piece of the puzzle.
MTD software that doesn’t help with compliance. Compliance tools that don’t help with MTD. I think there’s room for several of us solving this properly at a price that makes sense for small portfolios.
3. I didn’t know about the 31 May deadline for the Information Sheet — genuinely useful, thank you.
That’s the kind of thing that catches landlords out because nobody tells you until it’s too late.
Interesting approach with the hash-chained accountability record. Out of curiosity, is that aimed at dispute resolution, or more about giving landlords confidence that their records would stand up if challenged?
Looking forward to seeing how things develop post-launch. The more tools that exist for small landlords, the better the space gets for everyone.
Cheers,
Shawn
Member Since October 2024 - Comments: 9
9:43 AM, 6th May 2026, About 2 weeks ago
Hello William, This sounds interesting. Does it include some form of digital signing? Susan Sinclair
Member Since October 2024 - Comments: 9
10:33 AM, 8th May 2026, About 2 weeks ago
Will it include digital signing?
Member Since April 2026 - Comments: 14
4:04 PM, 11th May 2026, About 1 week ago
Reply to the comment left by Shawnavon Radcliffe at 28/04/2026 – 15:03
Shawn, thanks for taking the time, and for being generous about it. Genuinely good to hear from someone building in this space.
On (1): that is exactly the moment we built around. Most landlords I’ve spoken to are in the same position. The certificates exist, they were valid at the time, but two years later nobody can find the right one in the right version. The compliance phone call is the worst time to discover that.
On (2): I agree. The market is wider than it looks from the outside. Small landlords are the largest segment by count and the least well served by the existing tools, which were mostly built for letting agents or portfolio professionals. There is room for several of us to do this properly. Better products lift the whole space.
On (3): glad it was useful. It is a one-off, tied to the RRA transition. Every landlord with a tenancy in place before 1 May 2026 has to serve the prescribed Information Sheet by 31 May, or face a civil penalty of up to £7,000 and lose the ability to rely on certain Section 8 possession grounds until they cure it. The government only published the prescribed PDF on 20 March, with very little public awareness behind it. Plenty of landlords will only find out about it after they have missed it.
To your question on the Accountability Record: closer to your second framing. It is not designed to settle disputes, that is the tribunal’s job. It is designed so that if a landlord ever has to demonstrate what they did and when, the record stands up to scrutiny in a way a folder of PDFs cannot. Small landlords are the segment most likely to face that kind of challenge and the least likely to have records that survive it. That is the gap we are building for.
Same goes from this side, I’ll be watching where Doorkeep goes. Drop me a note any time.
William
Member Since April 2026 - Comments: 14
4:15 PM, 11th May 2026, About 1 week ago
Reply to the comment left by susan sinclair at 06/05/2026 – 09:43
Susan, thank you for reaching out directly: I have responded to you by email.
Member Since April 2026 - Comments: 2
4:17 PM, 11th May 2026, About 1 week ago
Thanks William