Rental valuation in London: what a proper one should include
Short answer: A proper London rental valuation is a written figure for your specific property, backed by comparable homes that actually let rather than asking prices, timed to your launch date, with notes on condition, a marketing plan and the fee stated as one number. An online estimate gives you none of that. Ask for every part in writing.
This post is the checklist: what you should be handed after the visit, and what should make you wary. What sets your rent in the first place is covered in how much rent can I get for my London flat.
What is a rental valuation, and is it the same as an appraisal?
In lettings, "rental valuation" and "rental appraisal" mean the same thing: an estimate of the rent a property should achieve. The name tells you nothing about quality. What matters is how the figure was reached and whether you can see the working. Sort them by what you are actually given.
| Online estimate | Verbal figure at the door | Written rental valuation | |
|---|---|---|---|
| Based on | A statistical model or an index average | The agent's judgement on the day | Comparable homes that let, plus a visit |
| Sees your floor, light, finish | No | Yes | Yes, and records it |
| Let prices or asking prices | Usually asking prices or averages | Not shown | Let prices, listed so you can check them |
| One figure to advertise | No | Often a range | Yes |
| Launch timing | No | Rarely | Yes, tied to a date |
| Marketing plan and fee | No | Sometimes, spoken | Yes, written down |
An index average is not a valuation either. The ONS put the average London private rent at £2,332 a month in August 2026, up 3.5% on the year (ONS, released 16 September 2026). That figure "measures private rent inflation for new and existing tenancies", so it includes rents agreed years ago. It is a backdrop. It is not what your flat will let for this month.
What should a written rental valuation include?
Seven things. If any is missing, ask for it.
- One figure to advertise. Under section 56 of the Renters' Rights Act 2025, in force since 1 May 2026, an advert or written offer must state a specific rent. A valuation can explain the range it considered, but it should end on the single number you will put on the portals.
- Comparables that let, not comparables that are listed. Asking prices are what landlords hope for; agreed rents are what tenants paid. Ask for the building, the bedroom count, the rent agreed and when. If the evidence is thin, as it often is for a new-build's first let, the valuation should say so (see new-build rental valuation in London).
- A date, and a launch plan. A figure is true for a moment. The valuation should say when it was prepared and when the advert should go live. Our three years of Rightmove and Zoopla data show August carries the highest enquiries-to-listings ratio of the year, Monday morning is the best launch slot, and advertising more than four weeks before the home is available costs it prime portal position.
- Condition and presentation notes. What the valuer saw (floor, aspect, kitchen, bathroom, any snagging or wear) and what, if anything, they would change before launch.
- The marketing plan. Where the advert runs, the photography and floor plan, and who does the viewings.
- The fee, as a number. Every fee you would pay if you instruct, including what happens in a void or on a re-let. A valuation silent on fees is half a document.
- Who prepared it, and whether they visited. A named person who stood in the property, not a postcode run through a tool.
Why must the valuation end on one figure?
Because that figure becomes the ceiling and then the base. Section 56(3) of the Renters' Rights Act 2025 stops a landlord or anyone acting for them from inviting or encouraging an offer above the stated rent, or accepting one, so a home advertised too low cannot be bid up to the right rent. After the let, section 13 of the Housing Act 1988, as amended by the Renters' Rights Act 2025, allows no increase until 52 weeks after the tenancy began, and subsection (4A) closes the other routes. That is why items 1 and 3 on the checklist carry the most weight. The arithmetic of a wrong first figure is in why we won't take your instruction at the wrong asking price.
What are the red flags in a rental valuation?
- The highest number wins. If one agent is well above the other two, ask for the lets that support it. A flattering figure wins the instruction, then costs you the void.
- "We can always reduce it." You can, but by then the advert has spent its first weeks on the portals at the wrong price, and the home has sat empty while it did.
- A range and no single figure. You cannot advertise a range, so you have not yet been given a valuation.
- Comparables that are all current listings. Other landlords' hopes, not evidence.
- No visit, or no fee in writing. Nobody can price your floor from a postcode, and the fee belongs on the same page as the rent.
What does our rental valuation include?
Ours is free and there is no obligation to instruct us. A specialist visits in person and looks at the specification, floor, light, view and condition, weighed against more than three years of Rightmove and Zoopla evidence and the comparable homes we manage now.
You get today's figure, the launch-date prediction, and the evidence behind both: the data and comparables behind the number, whether or not you go on to let with us.
If you then instruct us, the fee is one number too: 10% of rent including VAT, only in the months a tenant is paying. Nothing during a void, nothing to re-let, no letting fee and no renewal fee.
We won't put a figure in front of you that we cannot show you the evidence for, and we won't round it up to win the instruction.
New to us? From 1 October 2026, a landlord who has not used Harvey W James before pays no management fee for the first three months in which rent is received. The offer covers the first fifty instructions we accept, or until 31 January 2027, whichever comes first. The terms are in our welcome offer post.
Sources
- Renters' Rights Act 2025, section 56 (requirement to state rent and to avoid rental bidding), in force 1 May 2026 (text as in force on 6 October 2026): https://www.legislation.gov.uk/ukpga/2025/26/section/56
- Housing Act 1988, section 13, as amended by the Renters' Rights Act 2025 (text as in force on 6 October 2026): https://www.legislation.gov.uk/ukpga/1988/50/section/13
- ONS, Private rent and house prices, UK: September 2026 (released 16 September 2026; London August 2026 figure; next release 21 October 2026): https://www.ons.gov.uk/economy/inflationandpriceindices/bulletins/privaterentandhousepricesuk/september2026
- Harvey W James, rental valuation page (/valuation), as at 6 October 2026
- Harvey W James, three-year Rightmove and Zoopla listing-and-enquiry dataset
- Harvey W James, welcome offer page and terms v1.2 of 21 September 2026 (/offer-three-months-free), offer opened 1 October 2026
Book a free rental appraisal: a specialist visits, and you get today's figure, the launch-date prediction and the evidence behind both.