Mortgage rates · Start here

Mortgage pricing basics

Every guide on Rate Lock Basics in reading order, with the calculators, the loan finder and the key terms in one place.

  • Reading time3 min
  • Official sources4 cited
  • Updated

5 guides, read top to bottom, take you from Mortgage Rate Locks Explained to A Rate Lock Decision Checklist.

Read in this order

  1. What a rate lock is, how long it lasts, what it costs and what happens if your closing is delayed.

    • A rate lock is a lender’s commitment to hold a specific interest rate and price for a set number of days while your loan is processed, as long as your application details do not change.
    • Common lock periods range from a couple of weeks to two months, and longer locks are usually priced higher because the lender carries market risk longer.
  2. How lock strategy differs when you have a contract closing date versus a flexible refinance.

    • Your lock must cover the contract closing date with a buffer for delays.
    • Without a contract date, you can choose when to apply.
  3. What happens when a rate lock is about to expire, and the options lenders commonly offer.

    • A rate lock holds pricing for a set number of days, commonly 30 to 60.
    • Many lenders let you extend a lock for a number of days at a cost, often expressed as a small fraction of the loan amount or a price adjustment.
  4. Common causes of mortgage closing delays, what disclosures change, and how to protect your purchase contract.

    • Delays often come from appraisal scheduling or low values, title issues, condo or HOA questionnaires, insurance placement, missing income or asset documents, and last-minute credit changes.
    • Purchase contracts set deadlines for financing and closing.
  5. How to think through when to lock, how long a lock you need and what to ask about extensions, before you commit.

    • A lock is only useful if it lasts until closing.
    • A lock generally fixes the interest rate and points for a set period, assuming your application details do not change.

Run your own numbers

5 calculators on this site, all blank until you type:

Check which programs fit

The loan finder asks six questions and points you to the programs worth reading about, with a side-by-side comparison table. It is education, not an eligibility decision.

Terms you will meet in these guides

Everything here is general education. Program rules change; confirm current requirements with the official sources below and with a licensed lender.

Sources

Sources reviewed . This page was assembled from the guides on this site.