HMO Mortgage FAQ Library

Question 1

Can you get 100% development finance?

David Sampson · Accepted Answer

Some facilities can cover a high share of cost when there is extra security or a strong track record. This page does not treat 100% of cost or 100% of GDV as a published HMO development product. Cash equity is usually required. Ask for a dated illustration on the scheme.

Question 2

How profitable are HMOs?

David Sampson · Accepted Answer

Profit is rent after voids, bills, finance and tax — not a brochure yield. A finished HMO can outperform a single let on the same street and still lose money if the build overran or the refinance GDV was optimistic. There is no single profit figure on this page.

Question 3

Is it hard to get a HMO mortgage?

David Sampson · Accepted Answer

A term HMO mortgage on a licensed, complete house is a specialist product, not a high-street single-let. Development finance is harder still because the house does not exist yet. The usual path is the development facility first, then a term HMO mortgage at exit.

Question 4

Are HMOs still a good investment?

David Sampson · Accepted Answer

They can be, where planning, licensing and room demand support the GDV you used to borrow. They are not a good investment if you modelled a seven-bed sui generis house on a C4 exit. This page is about funding the build, not a yield promise.

Question 5

How much does HMO make per room?

David Sampson · Accepted Answer

Room rent is local. A lender’s GDV uses the rents the valuer will accept, not a national per-room average. There is no published per-room profit on this page.

Question 6

Why are people selling their HMOs?

David Sampson · Accepted Answer

Landlords sell for the same reasons as any investment: a fix ending, a licence they cannot renew, a planning cap, or a better use of the capital. A sale can also be the exit from a development facility. It is not evidence that development finance has closed.

Question 7

What is HMO development finance?

David Sampson · Accepted Answer

A short-term loan to buy land or a house and build or convert it into an HMO. Funds are drawn against cost and finished value, usually with a monitoring surveyor. It is not a term HMO mortgage. The usual exit is a refinance or a sale.

Question 8

How much can I borrow for an HMO development?

David Sampson · Accepted Answer

The binding figure is the lower of loan-to-cost and loan-to-GDV on the named lender’s offer. This page does not publish a single LTC or LTGDV percentage. Model both, then ask for a dated illustration.

Question 9

What is LTGDV?

David Sampson · Accepted Answer

Loan-to-gross-development-value is the loan as a percentage of the lender’s finished HMO value. It sits beside loan-to-cost. If cost says you can borrow more than the finished value will support, GDV wins.

Question 10

Do I need planning before applying?

David Sampson · Accepted Answer

Many development lenders want a credible planning route before they complete, and almost all want lawful HMO use before the last money or the refinance. C3 to C4 can be permitted development unless Article 4 removes it (Use Classes Order 1987, SI 1987/764). Seven or more occupiers is sui generis and needs permission.

Related reading: HMO Development Finance Requirements: Lender Criteria Explained · HMO Development Finance Rates & Fees Explained (2026)

David Sampson · Updated 22 October 2026

Question 11

How do I exit development finance?

David Sampson · Accepted Answer

Refinance the finished, licensable house onto a term HMO or commercial HMO mortgage, or sell it. Build refinance legal time into the facility term. An expired development loan with no term offer is how people take a second, more expensive bridge.

Question 12

What should be included in a build cost breakdown?

David Sampson · Accepted Answer

A comprehensive build cost breakdown should include: structural work, internal finishes, external works, professional fees, and 5-10% contingency. Each component should be itemized with estimated costs to help secure development finance.

Question 13

How much of my build costs can be funded by development finance?

Milly Turner · Accepted Answer

The binding figure is the lower of loan-to-cost and loan-to-GDV on the named lender’s offer. This page does not publish a single funding percentage. You will usually contribute cash equity. Ask for a dated illustration on the scheme.

Question 14

How much contingency should I include in my build costs?

Sarah Johnson · Accepted Answer

It's recommended to include a contingency of 5-10% of your total build costs. This buffer helps cover unexpected expenses, price increases, or scope changes during the project. For complex HMO conversions or properties requiring significant structural work, consider using the higher end of this range. Lenders will expect to see this contingency in your cost breakdown.

Related reading: HMO Development Finance Requirements: Lender Criteria Explained · HMO Development Finance Rates & Fees Explained (2026)

Sarah Johnson · Updated 17 May 2026

Question 15

How do I evaluate an HMO conversion opportunity?

Sarah Johnson · Accepted Answer

Evaluate HMO conversion opportunities by assessing: local planning policy and Article 4 direction status, potential room yield and optimal layout configuration, structural suitability and conversion costs, and local rental demand.

FAQs | HMO Mortgage Questions Answered