Understand shared ownership valuations and staircasing

A shared ownership valuation is a formal property assessment carried out by a RICS-registered surveyor under the Red Book professional standards. It establishes the current open market value of a shared ownership property, which is needed when you buy additional shares of 5% or more (known as staircasing) or sell your home.

Unlike a standard mortgage valuation, which is arranged by your lender and carried out for their benefit, a shared ownership valuation serves a specific contractual purpose. Your housing association requires it to calculate the price of any additional equity you want to purchase, or to confirm the sale price if you are selling. The valuation must comply with RICS Valuation Global Standards, commonly known as the Red Book, which set out the methodology the surveyor must follow and the professional standards they must meet.

The result is a formal written report stating the property's market value at the date of inspection. This figure then feeds directly into the financial calculations for your next step, whether that is buying more shares, listing for sale, or securing a new mortgage deal. It is separate from a house survey, which assesses the physical condition of the building rather than its value. If you are exploring the broader survey landscape, our guide to types of house survey explains how condition surveys and valuations differ and when you might need both.

There are three main situations where you will need a shared ownership valuation, each with different requirements around timing, who commissions it, and what happens with the result.

The first is when you are buying your initial share. Your mortgage lender will require a valuation to confirm the full market value of the property before they agree to lend. This valuation is typically arranged through your lender as part of the mortgage application, and the cost is often bundled into your mortgage fees. The housing association may also require a separate independent valuation, depending on their own policies.

The second, and most common, trigger is staircasing. When you want to buy additional shares in your property, the housing association needs a current market valuation to calculate the price per share. For shares of 5% or more you need a valuation by a RICS-registered surveyor, and you pay for it. Your landlord will tell you whether they arrange the valuation or you need to arrange it yourself. The housing association will not accept an informal estimate or an online valuation tool.

If you bought your home on or after 1 April 2021, you may also be able to buy shares of 1% each year for the first 15 years. Ask your landlord whether this applies to you, and check the key information document for your home. The price of a 1% share is based on the original price of your home, increased or decreased in line with the House Price Index, unless you or your landlord choose to use a RICS valuation instead. Whoever asks for the RICS valuation must pay for it.

The third situation is selling. If you own less than 100% of the equity, the housing association typically has the right to find a buyer within a set nomination period of 4, 8 or 12 weeks, depending on the lease. The sale price is based on a RICS valuation. Either you or your landlord will arrange it, and you still pay for it. The table below summarises when each type of valuation is needed and who pays for it.

The cost of a shared ownership valuation depends on the type of assessment and the complexity of your property. A standard RICS Red Book valuation, which involves a physical inspection of the property, typically costs between £250 and £500.

Several factors influence where your valuation fee falls within this range. Larger properties, those in areas with limited comparable sales data, and properties with non-standard construction or recent extensions tend to cost more to value. London and the South East are generally at the higher end of the range, while prices in northern England, Wales and Scotland are often lower. These figures are based on industry data from RICS-regulated valuers as of early 2026. For a broader picture of how survey and valuation costs compare across different property types, see our guide to house survey costs.

The shared ownership valuation follows a structured process set out by RICS professional standards. Understanding each step helps you prepare and avoid delays that could push you past the three-month validity window.

1. Instruct a RICS-registered valuer. Your housing association may provide a list of approved valuers, or you can find one independently through the RICS Find a Surveyor directory. The valuer must hold appropriate qualifications and professional indemnity insurance. For guidance on choosing a surveyor, see our guide to RICS surveyors.
2. Property inspection. The valuer visits your home to assess its size, condition, layout, any improvements you have made, and the surrounding area. A standard inspection takes 30 to 60 minutes for a typical flat or house.
3. Comparable evidence assessed. After the visit, the valuer researches recent sale prices of similar properties in your area. This comparable analysis, adjusted for differences in size, condition and location, forms the backbone of the final valuation figure.
4. Red Book report issued. The valuer produces a formal report stating the property's estimated market value, the methodology used, any assumptions or caveats, and the effective date. Reports are usually delivered within 5 to 10 working days after the inspection.
5. Three-month validity period begins. Your valuation is valid for three months from the date of the report. If your staircasing does not complete within that window, you will usually need a new valuation at additional cost. If you are selling, an offer accepted within the window gives the buyer a further 3 months to exchange contracts. This deadline catches many shared owners off guard, so factor it into your planning from the outset.

A valuation that feels wrong can have a significant financial impact on your next step. If the figure comes back higher than you expected, each additional share you buy through staircasing will cost more, increasing both your upfront payment and your mortgage requirements. If it comes back lower than expected, you may struggle to sell at a price that covers your outstanding mortgage, or the lower value could affect your loan-to-value ratio when remortgaging.

If you believe the valuation is too high, you have the right to challenge it. Start by checking the comparable evidence the valuer has used in their report. Look at recent sale prices on property portals for similar homes in your area and compare them to the properties cited. If you can identify comparable sales that support a lower figure, present this evidence to the valuer in writing and ask them to reconsider. Some housing associations have a formal dispute resolution process outlined in the lease, which may involve instructing a second independent valuer at your cost.

If the valuation is too low, the impact depends on your situation. For staircasing, a lower valuation actually works in your favour because you pay less per additional share. For selling, however, a low valuation means a lower asking price and potentially less equity to take into your next purchase. You can challenge a low figure using the same comparable evidence approach.

In either case, acting quickly matters because of the three-month validity window. A challenge that drags on could force you to commission an entirely new valuation. For broader guidance on using survey and valuation results in negotiations, see our guide to negotiating after a survey.

These three assessments serve different purposes, and understanding what each one does helps you avoid paying for services you do not need, or skipping one you genuinely require.

• Shared ownership valuation: Establishes the current market value of your home for the specific purpose of staircasing, selling or satisfying your housing association's requirements. Carried out under RICS Red Book standards, it produces a formal report with a stated market value. You pay for it directly, typically £250 to £500.
• Mortgage valuation: Arranged by your lender to confirm the property is worth enough to secure the loan they are offering. It may involve a physical visit or just a desktop assessment. The lender uses it for their own risk management, not to inform you about the property's condition or true value. You may pay for it as part of your mortgage fees, or the lender may cover the cost.
• House survey (Level 2 or Level 3): A detailed inspection of the property's physical condition that identifies structural problems, damp, roofing issues and other defects. It does not provide a formal market valuation unless you specifically request one as an add-on. Costs range from £300 to £1,500 depending on the level and property type.

If you are staircasing or selling, you will need the shared ownership valuation as a minimum. If you are also remortgaging, your lender will require their own mortgage valuation on top. And if you have any concerns about the property's physical condition, particularly with older shared ownership properties, a separate house survey is the only way to get a thorough assessment. For a detailed breakdown of how mortgage valuations and surveys compare, see our guide to mortgage valuation vs survey.

Staircasing is the process of buying additional shares in your shared ownership property, potentially reaching 100% outright ownership. The valuation is a critical step in this journey, and getting the timing right affects everything that follows. Here is a typical staircasing timeline from start to finish.

1. Decide to staircase and check your lease. You can usually buy more shares at any time, but some leases make you wait a set period after you buy. They may also limit how many times you can staircase or set a minimum share increment. Read your lease carefully before committing to the process.
2. Notify your housing association. Contact them to confirm the process and any specific requirements, including whether they have a list of approved valuers you must use.
3. Instruct a valuer and arrange the inspection. The RICS valuation determines the current market value, which the housing association uses to calculate the cost of your additional shares.
4. Valuation report issued. Once you receive the report, you have three months to complete the transaction before it expires. This starts the clock on every subsequent step.
5. Instruct a solicitor. Your solicitor handles the legal work: updating the lease to reflect your new ownership percentage, managing the transfer of shares, and completing the land registry paperwork. For a breakdown of what this involves, see our guide to the conveyancing process. Solicitor fees for a straightforward staircasing transaction typically run from £500 to £1,500, which you can compare in our guide to conveyancing fees.
6. Remortgage if needed. If you need to borrow more to fund the additional shares, you arrange a remortgage or further advance with your lender. The lender carries out their own mortgage valuation at this stage.

The whole process, from instructing the valuer to completing the share purchase, typically takes 8 to 12 weeks. Planning the valuation early gives you maximum time within the three-month validity window to complete all the other steps without pressure.