On its appeal from a judgment requiring it to defend and to indemnify fully North American Site Developers, Inc. (NASDI), MRP Site Development, Inc. (MRP), argues that its indemnity obligation is limited by its contract with NASDI to the portion of liability attributable to its own conduct. NASDI *530appeals from that part of the judgment that declares that Morse Diesel International, Inc. (Morse), is not entitled to a defense or indemnification from Travelers Indemnity Company of Illinois (Travelers), or from MRP. Neither Morse nor Travelers appeals from the judgment. We conclude that MRP’s indemnity obligation to NASDI is proportional and that NASDI has failed to identify how it is harmed by the declaration that neither MRP nor Travelers has a duty to indemnify or defend Morse.

1. Background facts and procedural history. In February, 1998, Morse entered into a contract with the New Boston Corporation (NBGC) to provide construction management for NBGC on the Boston Garden Demolition and Fleet Center South Facade Renovation project. On March 11, 1998, having sought bids for demolition work on the project, Morse executed a letter of intent with NASDI, evidencing Morse’s intention to issue a $1,325 million subcontract to NASDI. The letter authorized NASDI to proceed immediately with certain preparatory work “unless otherwise directed.” Morse and NASDI executed the contract contemplated in the letter of intent on May 20, 1998.

On April 6, 1998, NASDI hired MRP to perform demolition on the project pursuant to a subcontract (MRP subcontract). MRP’s work for NASDI under the MRP subcontract began on April 10, 1998. Scott Duelos, an MRP employee, was injured while working at the site on April 11, 1998. The MRP subcontract required MRP to maintain comprehensive general liability insurance and to endorse the policy in the names of NASDI, its subsidiaries, NBGC, and others. MRP was also required by the MRP subcontract to list Morse among the additional insureds on its policy. MRP’s comprehensive general liability insurance policy was held by Travelers.

On April 14, 1999, Duelos brought an action in negligence (Duelos action) against the general contractor on the project, Morse, and Morse’s subcontractor, NASDI. Morse cross-claimed against NASDI for indemnity, and NASDI brought a third-party claim against MRP. Duelos ultimately settled his negligence action against Morse and NASDI, and the parties eventually stipulated to the dismissal of Duelos’s complaint against all named defendants as well as the third-party claim against MRP, and later, Morse’s cross claim against NASDI.

*531While the Duclos action was pending, however, Morse and NASDI brought the present action against MRP and Travelers, seeking a declaration that they (Morse and NASDI) were entitled to a defense and indemnification under the indemnity and defense clause of the MRP subcontract as well as the general liability insurance policy issued by Travelers to MRP.3 Ruling on cross motions for summary judgment, a judge concluded that MRP and Travelers were obligated to defend and to indemnify fully NASDI but not Morse in the Duelos action. Because Morse chose to dismiss its appeal from the judgment, see Mass.R.A.P. 29(b), 365 Mass. 877 (1974), and Travelers failed to file a brief in the appeal, see Mass.R.A.P. 16(a)(4), as amended, 367 Mass. 921 (1975), we consider only the arguments raised by MRP and NASDI on their cross appeals from the judgment.

We are left with MRP’s argument that its contractual indemnity obligation is limited to the share of liability attributed to its conduct and NASDI’s contention that Travelers owes a duty both to defend and to indemnify Morse. These claims are based on several clauses set out in the MRP subcontract.

2. The MRP subcontract. Article 11.10 of the MRP subcontract, the indemnity clause, reads in relevant part: *532Through article 10, Exhibit B to the MRP subcontract required MRP to maintain a comprehensive general liability insurance policy endorsed to name NASDI as an additional insured.5 It also required that insurance certificates name NASDI and Morse, among others, as additional insureds.

*531“To the fullest extent permitted by law, [MRP] shall indemnify, hold harmless, and defend (with counsel reasonably acceptable to [NASDI]) [NASDI] . . ., Owner, [and] Architect . . . from and against claims, damages, losses and expenses . . . arising out of or resulting from performance or non-performance of [MRP’s] Work under this Subcontract, provided that such claim, damage, loss or expense is attributable to bodily injury, sickness, disease or death . . . but only to the extent caused in whole or in part by the negligent or willful acts or omissions of [MRP] . . . regardless of whether or not such claim, damage, loss or expense is caused in part by a party indemnified hereunder”4 (emphasis supplied).

*532MRP’s policy with Travelers, as effective on the date of Duelos’s injuries, also contained a “BLANKET ADDITIONAL INSURED” endorsement (endorsement) amending the policy to include as an insured “any person or organization [the named insured is] required by written contract to include as an insured, but only with respect to liability arising out of [the named insured’s work].” Coverage under the endorsement applied only if the written contract was “executed prior to the occurrence of any loss.”

3. MRP’s appeal. To put MRP’s argument in focus, we repeat that provision in article 11.10 of the MRP subcontract previously set out and emphasized, that is, that MRP agreed to “indemnify . . . [NASDI]. . . from and against claims, damages, losses, and expenses . . . but only to the extent caused in whole or in part by the negligent or willful acts or omissions of [MRP].” Based on this language and the established principle that “[contracts of indemnity are to be fairly and reasonably construed in order to ascertain the intention of the parties and to effectuate the purpose sought to be accomplished,” New York, *533N.H. & H.R.R. v. Walworth Co., 340 Mass. 1, 3 (1959), quoting from Century Indem. Co. v. Bloom, 325 Mass. 52, 56 (1949); see Shea v. Bay State Gas Co., 383 Mass. 218, 222 (1981), MRP argues that its indemnity obligation is proportionately limited to its causal fault. Put another way, MRP contends that the prefatory phrase “but only to the extent” is a clear expression of intent to restrict its indemnity obligations to “only” those losses caused by the negligent or wilful conduct of MRP. NASDI contends first, that principles of negligence should not be brought to bear on questions of indemnity, because negligence on the part of an indemnitor is not generally required in order to trigger an obligation to indemnify; and second, that the public policy underlying the enforcement of construction contract indemnification provisions, namely, clarifying where the burden of acquiring insurance lies, would be undermined by MRP’s interpretation of the clause, which would require a judicial determination of negligence and comparative negligence.

While not raised by the parties, it appears that the instant indemnity clause is based upon the standard indemnity language contained in the 1987 edition of AIA Document A401, Standard Form of Agreement Between Contractor and Subcontractor, and the cognate provision of AIA Document A201, General Conditions of the Contract for Construction. The parties have not cited and we have not found any reported Massachusetts appellate decision construing similar language.6 However, other jurisdictions construing this language have concluded that it creates a proportionate indemnity obligation. See, e.g., East Harding, Inc. v. Horace A. Piazza & Assocs., 80 Ark. App. 143, 149-150 (2002); Hagerman Constr. Corp. v. Long Elec. Co., 741 N.E.2d 390, 393-394 (Ind. App. 2000); MSI Constr. Managers, Inc. v. Corvo Iron Works, Inc., 208 Mich. App. 340, 343-344 (1995); Braegelmann v. Horizon Dev. Co., 371 N.W.2d 644, 646 (Minn. App. 1985); Dillard v. Shaughnessy, Fickel & *534Scott Architects, Inc., 884 S.W.2d 722, 724-725 (Mo. App. 1994) (applying Kansas law); Nusbaum v. Kansas City, 100 S.W.3d 101, 106-107 (Mo. 2003); Mautz v. J.P. Patti Co., 298 N.J. Super. 13, 21 (App. Div. 1997); Greer v. Philadelphia, 568 Pa. 244, 250-251 (2002); Brown v. Boyer-Washington Blvd. Assocs., 856 P.2d 352, 355 (Utah 1993).

Although many of the cited cases seem to apply the rule that indemnity agreements are to be strictly construed against the indemnitee, a rule not followed in Massachusetts, see Herson v. New Boston Garden Corp., 40 Mass. App. Ct. 779, 782 (1996) (“[i]ndemnifcation provisions are to be read without any bias for the indemnitor or against the indemnitee”), we do not read those holdings as having turned on a narrow reading of an ambiguous indemnity provision. But see Braegelmann, supra. Rather, the phrase “to the extent caused in whole or part” is generally treated as a reasonably clear expression of the parties’ intent to limit a contractual indemnity obligation to losses caused by the indemnitor’s conduct. This latter aspect of reasoning in the holdings from other jurisdictions is consistent with the law of Massachusetts. See Herson v. New Boston Garden Corp., 40 Mass. App. Ct. at 782 (indemnification provisions “are to be interpreted like any other contract, with attention to language, background, and purpose”). Consequently, we conclude MRP’s indemnity obligation is limited under the MRP subcontract to losses caused by its own conduct.

To read the disputed language in the manner urged by NASDI would not only render the phrase meaningless, it would also be contrary to the basic principle that in construing disputed language set out in a contract, we should give words their plain and ordinary meaning. See Kelly v. Dimeo, Inc., 31 Mass. App. Ct. 626, 629 (1991). The word “extent” is commonly understood to speak to range, scope, and degree. See Webster’s Third New Intl. Dictionary 805 (1993), where the word “extent” is defined as “the range (as of inclusiveness or application) over which something extends.”

NASDI also argues that our courts have “steadfastly rejected subcontractors’ attempts to obtain proportionate indemnification.” There is nothing in G. L. c. 149, § 29C, that directly or indirectly prohibits proportionate indemnification *535provisions in subcontracts. Rather, the only prohibition set out in § 29C is against indemnification agreements that obligate a subcontractor to provide indemnification for losses that it in no way caused.7 See Miley v. Johnson & Johnson Orthopaedics, Inc., 41 Mass. App. Ct. 30, 32 (1996); Sciaba Constr. Corp. v. Frank Bean, Inc., 43 Mass. App. Ct. 66, 69-70 (1997); Joseph Francese, Inc. v. DOS Concrete Servs., Inc., 47 Mass. App. Ct. 367, 369 n.3 (1999). See also Masacchio, Statutory Limitations on Indemnity Agreements in Construction Contracts: The Meaning and Effect of G. L. M. c. 149, § 29C, 80 Mass. L. Rev. 54, 55 (1995).

4. NASDI’s appeal. The judgment provides that MRP and Travelers “owe neither a duty to defend nor a duty to indemnify Morse.” Morse stipulated to the dismissal of its appeal pursuant to Mass.R.A.P. 29(b). NASDI now claims that Morse, the general contractor, is entitled to a defense by and indemnification from Travelers. NASDI has not shown how its interests have been harmed by that declaration. See Warren v. Boston & Maine R.R., 163 Mass. 484, 485-486 (1895); Whalen v. Shivek, 326 Mass. 142, 149 (1950); Monize v. Frisoli, 6 Mass. App. Ct. 50, 51 (1978).

NASDI takes the position that Exhibit B to the MRP subcontract, see note 5, supra, required MRP to procure liability insurance for Morse. Based on that premise, NASDI argues that it has a contractual right to have Travelers indemnify Morse and that the judgment prevents it from realizing the benefit of its bargain. The obvious problem with NASDI’s argument is that any obligation owed by Travelers to defend and to indemnify Morse turns on the insurance contract between MRP and Travelers and not the subcontract between NASDI and MRP. To the extent MRP breached any contractual obligation to procure *536insurance for Morse, NASDI’s rights under the subcontract are against MRP and not Travelers.8

Moreover, it is difficult to understand NASDI’s contention that absent insurance coverage for Morse under MRP’s policy with Travelers, it (NASDI) may yet be called upon to indemnify Morse in connection with the Duelos action. As previously detailed in part 1 of this opinion, Duelos settled his negligence action against Morse and NASDI, the parties stipulated to a dismissal of Duelos’s complaint against all named defendants as well as NASDI’s third-party claim against MRP, and Morse and *537NASDI stipulated to a dismissal of Morse’s cross claim against NASDI.9 Whether NASDI is contractually obligated to Morse and, if so, to what extent, are questions that do not appear to have been raised in the present action. In any event, the terms of any settlement agreement between Morse and NADSI have not been made a part of the record before us.

5. Conclusion. Paragraphs la, 2, and 3 of the judgment are affirmed. Paragraph lb is reversed, and the matter is remanded to the Superior Court for a determination of MRP’s proportionate liability for injuries caused by its negligent or wilful acts or omissions.

So ordered.