Window replacement is one of the bigger jobs most homeowners take on, and the quotes can look very far apart. One company prices the windows only, another includes removal and making good, and a third quotes a different glass without saying so. The difference is rarely just the brand of window. It is usually the specification, how carefully the window is fitted, and what is included around it.
This guide is for homeowners in the United States and the United Kingdom. It covers when replacement makes sense, how materials and glass differ, why installation matters as much as the window, what the cost depends on, the permit and approval rules, what a written quote should list, and how to hire a window installer you can trust. Where the rules differ between the two countries, there are separate notes.
Window replacement: frames, glass and how windows open
Before you ask for quotes, it helps to know the main choices. You do not need to decide everything yourself, but you should understand what each installer is offering.
- Frame material: PVC (vinyl) frames are common and need little upkeep. Aluminium frames are slim and strong; look for a thermally broken profile, which has an insulating barrier inside the frame. Timber frames suit older homes and need regular maintenance.
- Glass: double glazing is standard; triple glazing adds another pane for extra insulation and noise reduction. Toughened (tempered) or laminated safety glass is used where glass could be broken by a fall or impact, such as near doors or low down.
- Opening type: fixed, side-hung, top-hung, tilt-and-turn, sliding or sash windows all cost and perform differently, and some are easier to clean from inside.
- Extras: shutters, insect screens, trickle vents, restrictors and locks.
Measurements must be taken on site by the installer, not guessed from a phone call. Openings in older homes are rarely square, and a window ordered to the wrong size either leaves big gaps or does not fit at all. Ask who will measure, and make sure the person who measures works for the firm that will fit the window.
Why installation matters as much as the window
A good window fitted badly will leak, let in draughts and lose heat. The installation is where most problems start, and it is the part of the job you see least once it is finished.
- Sealing: the joint between the frame and the wall should be airtight on the inside and weathertight on the outside, so warm air stays in and rain stays out.
- Foam and tapes: expanding foam alone is not a seal. Ask what sealing tapes or membranes they use around the frame.
- Sills and reveals: the window sill and the sides of the opening often need repair after the old frame comes out.
- Removal and waste: taking out the old frames carefully, protecting the room, and taking the old windows and glass away.
- Making good: plaster and paint touch-ups around each window, inside and out.
Ask each installer to explain how they seal the frame, and who repairs the sills and reveals. A firm that cannot answer clearly is a warning sign, whatever the price.
Window replacement cost: what the price depends on
A figure you find online cannot price your home. Two houses with the same number of windows can be very different jobs. These are the items that move the number, and the table below shows how they apply to common jobs.
| Type of job | What it usually involves | What raises the price |
|---|---|---|
| Like-for-like replacement | Same size and opening type, new frame and glass. | Number of windows, larger sizes, triple glazing, safety glass. |
| Change of material or opening | For example timber to PVC, or fixed to opening. | New hardware, more complex frames, extra measuring. |
| Upper-floor windows | Fitting from inside or with access equipment. | Height, scaffolding, awkward access at the back of the house. |
| Removal and disposal | Taking out the old frames and taking them away. | Rotten or stuck frames, many windows, old glass. |
| Sills and reveals | Repairing or replacing the sill and the sides of the opening. | Damaged plaster or brick, new sills inside or out. |
| Making good | Plaster and paint touch-ups after fitting. | Size of the area, matching existing finishes. |
| Extras | Shutters, insect screens, locks, restrictors. | Number of windows fitted with them, motorised shutters. |
Get two or three written quotes for the same windows and the same specification. If one quote is much lower, check what it leaves out: removal, making good, safety glass or the installation warranty are the usual gaps.
Posting a job on Hirovo is free. Say how many windows you want to replace, roughly how big they are, which floor they are on, and the material you have in mind. Add photos of the windows inside and out if you can. Window installers nearby can apply or message you in the app. You compare them and decide.
Post a free job →Permits, approvals and lead-safe work
United States
Permit rules depend on your city. Some places require a permit for replacement windows and others do not, so check with your local building department, or ask the installer to confirm in writing who handles it.
On the window itself, look for the NFRC label, which shows the U-factor and the SHGC, and an ENERGY STAR label if efficiency matters to you. Ask for these figures in the quote so you can compare offers fairly.
If your home was built before 1978, the EPA’s Renovation, Repair and Painting (RRP) rule requires a lead-safe certified firm for work that disturbs painted surfaces, and window replacement usually does. Ask whether the firm is certified before you sign anything.
England and Wales
Replacement windows must meet the Building Regulations. The usual route is to use an installer registered with a competent person scheme such as FENSA or CERTASS. A registered installer can self-certify the work, so you do not have to apply to building control separately. If your installer is not registered, you need building control approval for the job. Ask which route applies before work starts, and keep the paperwork, because you may need it when you sell the house.
If your home is a listed building or sits in a conservation area, you may need consent before changing the windows. Check with your local council first. Elsewhere in the UK, ask your local council which rules apply.
Before fitting day: clear the area in front of each window inside, take down curtains and blinds, move fragile items, and agree where the old frames will be stored until they are taken away. Ask how long each window will be open to the weather, and what happens if it rains.
How to hire a window installer: what the written quote should list
A clear quote protects both sides. Ask for it in writing, by message or email, before you pay any deposit. It should say:
- Which windows are being replaced, with sizes and opening types.
- The frame material and profile, and the glass type: double or triple, and where safety glass is used.
- The thermal performance of the window, if the manufacturer gives a figure.
- Whether installation is included, and how the frame will be sealed.
- Removal and disposal of the old frames and glass.
- Sills, reveals and making good: what is included, and what is not.
- Extras such as shutters, insect screens and locks.
- How long the job will take, and when it can start.
- The warranty, with the product warranty and the installation warranty listed separately.
- How payment works, the deposit, and when the balance is due.
- Who arranges the permit or building regulations sign-off.
The two warranties are different things. The product warranty covers faults in the window itself, such as failed glass units or broken handles. The installation warranty covers the fitting: leaks, draughts and gaps around the frame. Make sure you know who to call for each, and for how long.
Questions to ask a window installer
- Who will measure the windows, and will the same firm fit them?
- How do you seal the frame inside and out?
- Is removal of the old frames and disposal included?
- Who repairs the sills and reveals, and is making good included?
- Where will you use safety glass?
- In the US: do I need a permit here, and is your firm lead-safe certified if my home was built before 1978?
- In England and Wales: are you registered with a competent person scheme, or will we need building control approval?
- Can I see proof of your insurance?
- What does each warranty cover, and for how long?
Using a free Hirovo job post
Posting a job on Hirovo is free. Describe the windows you want to replace, choose your area, and window installers nearby can apply or message you. Hirovo is a small platform in the US and UK and the number of registered installers there is still limited, so replies may take time or may not come at all, and it is worth using alongside other ways of finding local tradespeople. Hirovo does not verify identity, insurance, registrations or reviews, and it is not an employer, agent or party to the work, so run the checks above on anyone who responds.
In short
Window replacement cost depends on the number and size of your windows, the frame and glass, the opening type, extras, height and access, removal, and making good. A good installation matters as much as a good window. Get a written quote that lists all of it, with separate product and installation warranties. In the US, check permits and, for pre-1978 homes, lead-safe certification. In England and Wales, use a competent person scheme installer or get building control approval.