Part Exchange Calculator
Compare a developer part exchange offer against selling on the open market, after agent fees and the months of holding costs it avoids.
💼 Are you a real estate agent or broker? Send this calculator to your buyers on your own branded listing page — every enquiry comes straight to your WhatsApp. Create free agent page →Developers offering part exchange buy your existing home at a discount so a new build sale can complete quickly and chain-free. The discount is real, and so are the agent fees, months of marketing and chain risk it removes.
Whether it is a good deal depends entirely on where the break-even sits. Below it you are paying a large premium for certainty; above it you are being paid to take it.
The comparison
Selling on the open market nets the value less the agent fee, less the cost of holding the property while it sells. Part exchange nets the offer with no fee and no marketing period. The break-even is the offer at which the two are identical.
Worked example
A home worth 400,000 with a 5% agent fee nets 380,000, less four months of holding at 1,800 — 372,800. A part exchange offer of 370,000 is a 7.5% discount to market, and 2,800 worse than selling yourself. The developer would need to offer 372,800 to match.
Check the new build price separately
A generous part exchange offer is sometimes funded by a firmer price on the new home. Negotiate the two independently: establish what the developer would accept for the new property from a cash buyer, then discuss the part exchange.
Turn a calculation into an enquiry
Buyers who run these numbers are ready to talk. Give every listing its own page with your photo, phone and WhatsApp on it — leads land straight on your phone.
Create your free property pageFrequently asked questions
What discount do developers usually apply?
Commonly five to ten percent below independently assessed market value, based on valuations they commission. Against saved fees and months of holding, that is frequently closer to break-even than it first appears.
Can I negotiate the part exchange offer?
Sometimes, particularly toward the end of a sales period or on a slow-selling plot. Independent valuations of your own home are the strongest lever, since their offer is derived from valuations they chose.
What are the conditions?
Usually that your home is worth below a proportion of the new one, is a standard property type, and is in a condition and location they can resell. Leasehold, unusual construction and high-value homes are frequently excluded.